HTTP/2 (2.4.20 through 2.4.39) very early pushes, for example configured with "H2PushResource", could lead to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that of the configured push link header values, not data supplied by the client.

The remote Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RLSA-2020:4751 advisory.

  - In Apache HTTP server versions 2.4.37 and prior, by sending request bodies in a slow loris way to plain     resources, the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming     data. This affects only HTTP/2 (mod_http2) connections. (CVE-2018-17189)

  - A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38. Using fuzzed network input, the http/2     request handling could be made to access freed memory in string comparison when determining the method of     a request and thus process the request incorrectly. (CVE-2019-0196)

  - A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38. When HTTP/2 was enabled for a http: host     or H2Upgrade was enabled for h2 on a https: host, an Upgrade request from http/1.1 to http/2 that was not     the first request on a connection could lead to a misconfiguration and crash. Server that never enabled     the h2 protocol or that only enabled it for https: and did not set H2Upgrade on are unaffected by this     issue. (CVE-2019-0197)

  - HTTP/2 (2.4.20 through 2.4.39) very early pushes, for example configured with H2PushResource, could lead     to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that of     the configured push link header values, not data supplied by the client. (CVE-2019-10081)

  - In Apache HTTP Server 2.4.18-2.4.39, using fuzzed network input, the http/2 session handling could be made     to read memory after being freed, during connection shutdown. (CVE-2019-10082)

  - In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the     mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point     to a page of their choice. This would only be exploitable where a server was set up with proxying enabled     but was misconfigured in such a way that the Proxy Error page was displayed. (CVE-2019-10092)

  - In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip was configured to use a trusted intermediary proxy     server using the PROXY protocol, a specially crafted PROXY header could trigger a stack buffer overflow     or NULL pointer deference. This vulnerability could only be triggered by a trusted proxy and not by     untrusted HTTP clients. (CVE-2019-10097)

  - In Apache HTTP server 2.4.0 to 2.4.39, Redirects configured with mod_rewrite that were intended to be     self-referential might be fooled by encoded newlines and redirect instead to an unexpected URL within the     request URL. (CVE-2019-10098)

  - In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be     self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within     the request URL. (CVE-2020-1927)

  - In Apache HTTP Server 2.4.0 to 2.4.41, mod_proxy_ftp may use uninitialized memory when proxying to a     malicious FTP server. (CVE-2020-1934)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version MAIN 6.06, has httpd packages installed that are affected by multiple vulnerabilities:

  - In Apache HTTP server versions 2.4.37 and prior, by sending request bodies in a slow loris way to plain     resources, the h2 stream for that request unnecessarily occupied a server thread cleaning up that incoming     data. This affects only HTTP/2 (mod_http2) connections. (CVE-2018-17189)

  - In Apache HTTP Server 2.4 release 2.4.37 and prior, mod_session checks the session expiry time before     decoding the session. This causes session expiry time to be ignored for mod_session_cookie sessions since     the expiry time is loaded when the session is decoded. (CVE-2018-17199)

  - A vulnerability was found in Apache HTTP Server 2.4.17 to 2.4.38. Using fuzzed network input, the http/2     request handling could be made to access freed memory in string comparison when determining the method of     a request and thus process the request incorrectly. (CVE-2019-0196)

  - A vulnerability was found in Apache HTTP Server 2.4.34 to 2.4.38. When HTTP/2 was enabled for a http: host     or H2Upgrade was enabled for h2 on a https: host, an Upgrade request from http/1.1 to http/2 that was not     the first request on a connection could lead to a misconfiguration and crash. Server that never enabled     the h2 protocol or that only enabled it for https: and did not set H2Upgrade on are unaffected by this     issue. (CVE-2019-0197)

  - HTTP/2 (2.4.20 through 2.4.39) very early pushes, for example configured with H2PushResource, could lead     to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that of     the configured push link header values, not data supplied by the client. (CVE-2019-10081)

  - In Apache HTTP Server 2.4.18-2.4.39, using fuzzed network input, the http/2 session handling could be made     to read memory after being freed, during connection shutdown. (CVE-2019-10082)

  - In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the     mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point     to a page of their choice. This would only be exploitable where a server was set up with proxying enabled     but was misconfigured in such a way that the Proxy Error page was displayed. (CVE-2019-10092)

  - Apache HTTP Server versions 2.4.20 to 2.4.43 When trace/debug was enabled for the HTTP/2 module and on     certain traffic edge patterns, logging statements were made on the wrong connection, causing concurrent     use of memory pools. Configuring the LogLevel of mod_http2 above info will mitigate this vulnerability     for unpatched servers. (CVE-2020-11993)

  - In Apache HTTP Server 2.4.0 to 2.4.41, redirects configured with mod_rewrite that were intended to be     self-referential might be fooled by encoded newlines and redirect instead to an an unexpected URL within     the request URL. (CVE-2020-1927)

  - Apache HTTP Server versions 2.4.0 to 2.4.46 A specially crafted Cookie header handled by mod_session can     cause a NULL pointer dereference and crash, leading to a possible Denial Of Service (CVE-2021-26690)

  - In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server     could cause a heap overflow (CVE-2021-26691)

  - ap_escape_quotes() may write beyond the end of a buffer when given malicious input. No included modules     pass untrusted data to these functions, but third-party / external modules may. This issue affects Apache     HTTP Server 2.4.48 and earlier. (CVE-2021-39275)

  - A carefully crafted request body can cause a buffer overflow in the mod_lua multipart parser     (r:parsebody() called from Lua scripts). The Apache httpd team is not aware of an exploit for the     vulnerabilty though it might be possible to craft one. This issue affects Apache HTTP Server 2.4.51 and     earlier. (CVE-2021-44790)

  - Apache HTTP Server 2.4.52 and earlier fails to close inbound connection when errors are encountered     discarding the request body, exposing the server to HTTP Request Smuggling (CVE-2022-22720)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote CentOS Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CESA-2020:4751 advisory.

  - httpd: mod_http2: DoS via slow, unneeded request bodies (CVE-2018-17189)

  - httpd: mod_http2: read-after-free on a string compare (CVE-2019-0196)

  - httpd: mod_http2: possible crash on late upgrade (CVE-2019-0197)

  - httpd: memory corruption on early pushes (CVE-2019-10081)

  - httpd: read-after-free in h2 connection shutdown (CVE-2019-10082)

  - httpd: limited cross-site scripting in mod_proxy error page (CVE-2019-10092)

  - httpd: null-pointer dereference in mod_remoteip (CVE-2019-10097)

  - httpd: mod_rewrite potential open redirect (CVE-2019-10098)

  - httpd: mod_rewrite configurations vulnerable to open redirect (CVE-2020-1927)

  - httpd: mod_proxy_ftp use of uninitialized value (CVE-2020-1934)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2020-4751 advisory.

    - Resolves: #1823263 (CVE-2020-1934) - CVE-2020-1934 httpd: mod_proxy_ftp use of       uninitialized value
    - Resolves: #1823259 - CVE-2020-1927 httpd:2.4/httpd: mod_rewrite configurations       vulnerable to open redirect
    - Resolves: #1747284 - CVE-2019-10098 httpd:2.4/httpd: mod_rewrite potential       open redirect
    - Resolves: #1747281 - CVE-2019-10092 httpd:2.4/httpd: limited cross-site       scripting in mod_proxy error page
    - Resolves: #1747291 - CVE-2019-10097 httpd:2.4/httpd: null-pointer dereference       in mod_remoteip
    - Resolves: #1869073 - CVE-2020-9490 httpd:2.4/mod_http2: httpd:
      Push diary crash on specifically crafted HTTP/2 header
    - Resolves: #1747289 - CVE-2019-10082 httpd:2.4/mod_http2: httpd:
      read-after-free in h2 connection shutdown
    - Resolves: #1696099 - CVE-2019-0197 httpd:2.4/mod_http2: httpd:
      mod_http2: possible crash on late upgrade
    - Resolves: #1696094 - CVE-2019-0196 httpd:2.4/mod_http2: httpd:
      mod_http2: read-after-free on a string compare
    - Resolves: #1677591 - CVE-2018-17189 httpd:2.4/mod_http2: httpd:
      mod_http2: DoS via slow, unneeded request bodies

    mod_md

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:4751 advisory.

    The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.

    The following packages have been upgraded to a later upstream version: mod_http2 (1.15.7). (BZ#1814236)

    Security Fix(es):

    * httpd: memory corruption on early pushes (CVE-2019-10081)

    * httpd: read-after-free in h2 connection shutdown (CVE-2019-10082)

    * httpd: null-pointer dereference in mod_remoteip (CVE-2019-10097)

    * httpd: mod_rewrite configurations vulnerable to open redirect (CVE-2020-1927)

    * httpd: mod_http2: DoS via slow, unneeded request bodies (CVE-2018-17189)

    * httpd: mod_http2: read-after-free on a string compare (CVE-2019-0196)

    * httpd: mod_http2: possible crash on late upgrade (CVE-2019-0197)

    * httpd: limited cross-site scripting in mod_proxy error page (CVE-2019-10092)

    * httpd: mod_rewrite potential open redirect (CVE-2019-10098)

    * httpd: mod_proxy_ftp use of uninitialized value (CVE-2020-1934)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.3 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1337 advisory.

    This release adds the new Apache HTTP Server 2.4.37 Service Pack 2 packages that are part of the JBoss     Core Services offering.

    This release serves as a replacement for Red Hat JBoss Core Services Pack Apache Server 2.4.37 Service     Pack 1 and includes bug fixes and enhancements. Refer to the Release Notes for information on the most     significant bug fixes and enhancements included in this release.

    Security Fix(es):

    * openssl: side-channel weak encryption vulnerability (CVE-2019-1547)

    * httpd: memory corruption on early pushes (CVE-2019-10081)

    * httpd: read-after-free in h2 connection shutdown (CVE-2019-10082)

    * httpd: null-pointer dereference in mod_remoteip (CVE-2019-10097)

    * openssl: information disclosure in fork() (CVE-2019-1549)

    * openssl: information disclosure in PKCS7_dataDecode and CMS_decrypt_set1_pkey (CVE-2019-1563)

    * httpd: limited cross-site scripting in mod_proxy error page (CVE-2019-10092)

    * httpd: mod_rewrite potential open redirect (CVE-2019-10098)

    * httpd: mod_rewrite configurations vulnerable to open redirect(CVE-2020-1927)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

New httpd packages are available for Slackware 14.0, 14.1, 14.2, and
-current to fix security issues.

According to the versions of the httpd packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - In Apache HTTP Server 2.4 release 2.4.37 and prior,     mod_session checks the session expiry time before     decoding the session. This causes session expiry time     to be ignored for mod_session_cookie sessions since the     expiry time is loaded when the session is     decoded.(CVE-2018-17199)

  - In Apache HTTP Server 2.4.18-2.4.39, using fuzzed     network input, the http/2 session handling could be     made to read memory after being freed, during     connection shutdown.(CVE-2019-10082)

  - HTTP/2 (2.4.20 through 2.4.39) very early pushes, for     example configured with 'H2PushResource', could lead to     an overwrite of memory in the pushing request's pool,     leading to crashes. The memory copied is that of the     configured push link header values, not data supplied     by the client.(CVE-2019-10081)

  - Some HTTP/2 implementations are vulnerable to     unconstrained interal data buffering, potentially     leading to a denial of service. The attacker opens the     HTTP/2 window so the peer can send without constraint     however, they leave the TCP window closed so the peer     cannot actually write (many of) the bytes on the wire.
    The attacker then sends a stream of requests for a     large response object. Depending on how the servers     queue the responses, this can consume excess memory,     CPU, or both.(CVE-2019-9517)

  - In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip     was configured to use a trusted intermediary proxy     server using the 'PROXY' protocol, a specially crafted     PROXY header could trigger a stack buffer overflow or     NULL pointer deference. This vulnerability could only     be triggered by a trusted proxy and not by untrusted     HTTP clients.(CVE-2019-10097)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to the versions of the httpd packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

  - In Apache HTTP Server 2.4.32-2.4.39, when mod_remoteip     was configured to use a trusted intermediary proxy     server using the 'PROXY' protocol, a specially crafted     PROXY header could trigger a stack buffer overflow or     NULL pointer deference. This vulnerability could only     be triggered by a trusted proxy and not by untrusted     HTTP clients.(CVE-2019-10097)

  - Some HTTP/2 implementations are vulnerable to     unconstrained interal data buffering, potentially     leading to a denial of service. The attacker opens the     HTTP/2 window so the peer can send without constraint     however, they leave the TCP window closed so the peer     cannot actually write (many of) the bytes on the wire.
    The attacker then sends a stream of requests for a     large response object. Depending on how the servers     queue the responses, this can consume excess memory,     CPU, or both.(CVE-2019-9517)

  - HTTP/2 (2.4.20 through 2.4.39) very early pushes, for     example configured with 'H2PushResource', could lead to     an overwrite of memory in the pushing request's pool,     leading to crashes. The memory copied is that of the     configured push link header values, not data supplied     by the client.(CVE-2019-10081)

  - In Apache HTTP Server 2.4.18-2.4.39, using fuzzed     network input, the http/2 session handling could be     made to read memory after being freed, during     connection shutdown.(CVE-2019-10082)

  - In Apache HTTP Server 2.4 release 2.4.37 and prior,     mod_session checks the session expiry time before     decoding the session. This causes session expiry time     to be ignored for mod_session_cookie sessions since the     expiry time is loaded when the session is     decoded.(CVE-2018-17199)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

A vulnerability was found in Apache httpd, in mod_http2. Under certain circumstances, HTTP/2 early pushes could lead to memory corruption, causing a server to crash.(CVE-2019-10081)

A read-after-free vulnerability was discovered in Apache httpd, in mod_http2. A specially crafted http/2 client session could cause the server to read memory that was previously freed during connection shutdown, potentially leading to a crash.(CVE-2019-10082)

A cross-site scripting vulnerability was found in Apache httpd, affecting the mod_proxy error page. Under certain circumstances, a crafted link could inject content into the HTML displayed in the error page, potentially leading to client-side exploitation.(CVE-2019-10092)

A vulnerability was discovered in Apache httpd, in mod_remoteip. A trusted proxy using the 'PROXY' protocol could send specially crafted headers that can cause httpd to experience a stack buffer overflow or NULL pointer dereference, leading to a crash or other potential consequences.\n\nThis issue could only be exploited by configured trusted intermediate proxy servers. HTTP clients such as browsers could not exploit the vulnerability.(CVE-2019-10097)

A vulnerability was discovered in Apache httpd, in mod_rewrite.
Certain self-referential mod_rewrite rules could be fooled by encoded newlines, causing them to redirect to an unexpected location. An attacker could abuse this flaw in a phishing attack or as part of a client-side attack on browsers.(CVE-2019-10098)

Some HTTP/2 implementations are vulnerable to unconstrained interal data buffering, potentially leading to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint; however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the wire. The attacker then sends a stream of requests for a large response object. Depending on how the servers queue the responses, this can consume excess memory, CPU, or both.(CVE-2019-9517)

An update of the httpd package has been released.

This update for apache2 fixes the following issues :

Security issues fixed :

CVE-2019-9517: Fixed HTTP/2 implementations that are vulnerable to unconstrained interal data buffering (bsc#1145575).

CVE-2019-10081: Fixed mod_http2 that is vulnerable to memory corruption on early pushes (bsc#1145742).

CVE-2019-10082: Fixed mod_http2 that is vulnerable to read-after-free in h2 connection shutdown (bsc#1145741).

CVE-2019-10092: Fixed limited cross-site scripting in mod_proxy (bsc#1145740).

CVE-2019-10098: Fixed mod_rewrite configuration vulnerablility to open redirect (bsc#1145738).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201909-04 (Apache: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in Apache. Please review       the CVE identifiers referenced below for details.
  Impact :

    Please review the referenced CVE identifiers for details.
  Workaround :

    There is no known workaround at this time.

This update for apache2 fixes the following issues :

Security issues fixed :

  - CVE-2019-9517: Fixed HTTP/2 implementations that are     vulnerable to unconstrained interal data buffering     (bsc#1145575).

  - CVE-2019-10081: Fixed mod_http2 that is vulnerable to     memory corruption on early pushes (bsc#1145742).

  - CVE-2019-10082: Fixed mod_http2 that is vulnerable to     read-after-free in h2 connection shutdown (bsc#1145741).

  - CVE-2019-10092: Fixed limited cross-site scripting in     mod_proxy (bsc#1145740).

  - CVE-2019-10097: Fixed mod_remoteip stack-based buffer     overflow and NULL pointer dereference (bsc#1145739).

  - CVE-2019-10098: Fixed mod_rewrite configuration     vulnerablility to open redirect (bsc#1145738).

This update was imported from the SUSE:SLE-15:Update update project.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4113-1 advisory.

    Stefan Eissing discovered that the HTTP/2 implementation in Apache did not properly handle upgrade     requests from HTTP/1.1 to HTTP/2 in some situations. A remote attacker could use this to cause a denial of     service (daemon crash). This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-0197)

    Craig Young discovered that a memory overwrite error existed in Apache when performing HTTP/2 very early     pushes in some situations. A remote attacker could use this to cause a denial of service (daemon crash).
    This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-10081)

    Craig Young discovered that a read-after-free error existed in the HTTP/2 implementation in Apache during     connection shutdown. A remote attacker could use this to possibly cause a denial of service (daemon crash)     or possibly expose sensitive information. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04.
    (CVE-2019-10082)

    Matei Badanoiu discovered that the mod_proxy component of Apache did not properly filter URLs when     reporting errors in some configurations. A remote attacker could possibly use this issue to conduct cross-     site scripting (XSS) attacks. (CVE-2019-10092)

    Daniel McCarney discovered that mod_remoteip component of Apache contained a stack buffer overflow when     parsing headers from a trusted intermediary proxy in some situations. A remote attacker controlling a     trusted proxy could use this to cause a denial of service or possibly execute arbitrary code. This issue     only affected Ubuntu 19.04. (CVE-2019-10097)

    Yukitsugu Sasaki discovered that the mod_rewrite component in Apache was vulnerable to open redirects in     some situations. A remote attacker could use this to possibly expose sensitive information or bypass     intended restrictions. (CVE-2019-10098)

    Jonathan Looney discovered that the HTTP/2 implementation in Apache did not properly limit the amount of     buffering for client connections in some situations. A remote attacker could use this to cause a denial of     service (unresponsive daemon). This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-9517)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

This update for apache2 fixes the following issues :

Security issues fixed :

CVE-2019-9517: Fixed HTTP/2 implementations that are vulnerable to unconstrained interal data buffering (bsc#1145575).

CVE-2019-10081: Fixed mod_http2 that is vulnerable to memory corruption on early pushes (bsc#1145742).

CVE-2019-10082: Fixed mod_http2 that is vulnerable to read-after-free in h2 connection shutdown (bsc#1145741).

CVE-2019-10092: Fixed limited cross-site scripting in mod_proxy (bsc#1145740).

CVE-2019-10097: Fixed mod_remoteip stack-based buffer overflow and NULL pointer dereference (bsc#1145739).

CVE-2019-10098: Fixed mod_rewrite configuration vulnerablility to open redirect (bsc#1145738).

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Several vulnerabilities have been found in the Apache HTTPD server.

  - CVE-2019-9517     Jonathan Looney reported that a malicious client could     perform a denial of service attack (exhausting h2     workers) by flooding a connection with requests and     basically never reading responses on the TCP connection.

  - CVE-2019-10081     Craig Young reported that HTTP/2 PUSHes could lead to an     overwrite of memory in the pushing request's pool,     leading to crashes.

  - CVE-2019-10082     Craig Young reported that the HTTP/2 session handling     could be made to read memory after being freed, during     connection shutdown.

  - CVE-2019-10092     Matei 'Mal' Badanoiu reported a limited cross-site     scripting vulnerability in the mod_proxy error page.

  - CVE-2019-10097     Daniel McCarney reported that when mod_remoteip was     configured to use a trusted intermediary proxy server     using the 'PROXY' protocol, a specially crafted PROXY     header could trigger a stack buffer overflow or NULL     pointer deference. This vulnerability could only be     triggered by a trusted proxy and not by untrusted HTTP     clients. The issue does not affect the stretch release.

  - CVE-2019-10098     Yukitsugu Sasaki reported a potential open redirect     vulnerability in the mod_rewrite module.

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.41. It is, therefore, affected by multiple vulnerabilities:

 - A cross-site scripting (XSS) vulnerability exists in mod_proxy when proxying is enabled and Proxy Error page is displayed. (CVE-2019-10092)

 - An open redirect vulnerability exists in mod_rewrite when using self-referential redirects. (CVE-2019-10098)

 - A read-after-free vulnerability exists in mod_http2 during connection shutdown. (CVE-2019-10082)

 - A memory corruption vulnerability exists in mod_http2 on early pushes. (CVE-2019-10081)

 - A denial of service (DoS) vulnerability exists in mod_http2 by exhausting h2 workers. (CVE-2019-9517)

 - A stack buffer overflow and NULL pointer dereference vulnerabilities exist in mod_remoteip when using a specially crafted PROXY header. (CVE-2019-10097)

Note that the scanner has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Apache httpd installed on the remote host is prior to 2.4.41. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.41 advisory, including the following:

  - A limited cross-site scripting issue was reported affecting the mod_proxy error page. An attacker could     cause the link on the error page to be malformed and instead point to a page of their choice. This would     only be exploitable where a server was set up with proxying enabled but was misconfigured in such a way     that the Proxy Error page was displayed. (CVE-2019-10092)

  - HTTP/2 (2.4.20 through 2.4.39) very early pushes, for example configured with H2PushResource, could lead     to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that     of the configured push link header values, not data supplied by the client. (CVE-2019-10081)

  - Some HTTP/2 implementations are vulnerable to unconstrained internal data buffering, potentially leading     to a denial of service. The attacker opens the HTTP/2 window so the peer can send without constraint;
    however, they leave the TCP window closed so the peer cannot actually write (many of) the bytes on the     wire. The attacker then sends a stream of requests for a large response object. Depending on how the     servers queue the responses, this can consume excess memory, CPU, or both. (CVE-2019-9517)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

SO-AND-SO reports : SECURITY: CVE-2019-10081 mod_http2: HTTP/2 very early pushes, for example configured with 'H2PushResource', could lead to an overwrite of memory in the pushing request's pool, leading to crashes. The memory copied is that of the configured push link header values, not data supplied by the client. SECURITY: CVE-2019-9517 mod_http2: a malicious client could perform a DoS attack by flooding a connection with requests and basically never reading responses on the TCP connection. Depending on h2 worker dimensioning, it was possible to block those with relatively few connections. SECURITY:
CVE-2019-10098 rewrite, core: Set PCRE_DOTALL flag by default to avoid unpredictable matches and substitutions with encoded line break characters. SECURITY: CVE-2019-10092 Remove HTML-escaped URLs from canned error responses to prevent misleading text/links being displayed via crafted links. SECURITY: CVE-2019-10097 mod_remoteip:
Fix stack-based buffer overflow and NULL pointer deference when reading the PROXY protocol header. CVE-2019-10082 mod_http2: Using fuzzed network input, the http/2 session handling could be made to read memory after being freed, during connection shutdown.

ID	Name	Product	Family	Severity
184538	Rocky Linux 8 : httpd:2.4 (RLSA-2020:4751)	Nessus	Rocky Linux Local Security Checks	critical
174760	NewStart CGSL MAIN 6.06 : httpd Multiple Vulnerabilities (NS-SA-2023-1001)	Nessus	NewStart CGSL Local Security Checks	critical
145821	CentOS 8 : httpd:2.4 (CESA-2020:4751)	Nessus	CentOS Local Security Checks	critical
142762	Oracle Linux 8 : httpd:2.4 (ELSA-2020-4751)	Nessus	Oracle Linux Local Security Checks	critical
142397	RHEL 8 : httpd:2.4 (RHSA-2020:4751)	Nessus	Red Hat Local Security Checks	critical
135235	RHEL 6 / 7 : Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP2 (RHSA-2020:1337)	Nessus	Red Hat Local Security Checks	critical
135160	Slackware 14.0 / 14.1 / 14.2 / current : httpd (SSA:2020-091-02) (Internal Data Buffering)	Nessus	Slackware Local Security Checks	critical
135146	EulerOS Virtualization for ARM 64 3.0.6.0 : httpd (EulerOS-SA-2020-1359)	Nessus	Huawei Local Security Checks	critical
133989	EulerOS 2.0 SP8 : httpd (EulerOS-SA-2020-1155)	Nessus	Huawei Local Security Checks	critical
130281	Amazon Linux AMI : httpd24 (ALAS-2019-1311) (Internal Data Buffering)	Nessus	Amazon Linux Local Security Checks	critical
130109	Photon OS 1.0: Httpd PHSA-2019-1.0-0253	Nessus	PhotonOS Local Security Checks	critical
130101	Photon OS 3.0: Httpd PHSA-2019-3.0-0035	Nessus	PhotonOS Local Security Checks	critical
129688	Photon OS 2.0: Httpd PHSA-2019-2.0-0178	Nessus	PhotonOS Local Security Checks	critical
128612	SUSE SLES12 Security Update : apache2 (SUSE-SU-2019:2329-1) (Internal Data Buffering)	Nessus	SuSE Local Security Checks	critical
128593	GLSA-201909-04 : Apache: Multiple vulnerabilities (Internal Data Buffering)	Nessus	Gentoo Local Security Checks	critical
128460	openSUSE Security Update : apache2 (openSUSE-2019-2051) (Internal Data Buffering)	Nessus	SuSE Local Security Checks	critical
128412	Ubuntu 16.04 LTS / 18.04 LTS : Apache HTTP Server vulnerabilities (USN-4113-1)	Nessus	Ubuntu Local Security Checks	critical
128316	SUSE SLED15 / SLES15 Security Update : apache2 (SUSE-SU-2019:2237-1) (Internal Data Buffering)	Nessus	SuSE Local Security Checks	critical
128182	Debian DSA-4509-1 : apache2 - security update (Internal Data Buffering)	Nessus	Debian Local Security Checks	critical
98669	Apache 2.4.x < 2.4.41 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
128033	Apache 2.4.x < 2.4.41 Multiple Vulnerabilities	Nessus	Web Servers	critical
127951	FreeBSD : Apache -- Multiple vulnerabilities (caf545f2-c0d9-11e9-9051-4c72b94353b5) (Internal Data Buffering)	Nessus	FreeBSD Local Security Checks	critical

Detections

Analytics

CVE-2019-10081

high

Tenable Plugins

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical

critical