null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to crash the server via a malicious request. Users are recommended to upgrade to version 2.4.60, which fixes this issue.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2024:2405-1 advisory.

    - CVE-2024-38477: Fixed null pointer dereference in mod_proxy (bsc#1227270)
    - CVE-2024-39573: Fixed potential SSRF in mod_rewrite (bsc#1227271)

Tenable has extracted the preceding description block directly from the SUSE 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 Debian 11 / 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-5729 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5729-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     July 11, 2024                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : apache2     CVE ID         : CVE-2024-36387 CVE-2024-38473 CVE-2024-38474 CVE-2024-38475                      CVE-2024-38476 CVE-2024-38477 CVE-2024-39573

    Multiple vulnerabilities have been discovered in the Apache HTTP server,     which may result in authentication bypass, execution of scripts in     directories not directly reachable by any URL, server-side request     forgery or denial of service.

    For the oldstable distribution (bullseye), these problems have been fixed     in version 2.4.61-1~deb11u1.

    For the stable distribution (bookworm), these problems have been fixed in     version 2.4.61-1~deb12u1.

    We recommend that you upgrade your apache2 packages.

    For the detailed security status of apache2 please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/apache2

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian 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 Fedora 40 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2024-39f1a828ed advisory.

    - version update
    - security update

Tenable has extracted the preceding description block directly from the Fedora 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 Ubuntu 20.04 LTS / 22.04 LTS / 23.10 / 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6885-1 advisory.

    Marc Stern discovered that the Apache HTTP Server incorrectly handled serving WebSocket protocol upgrades     over HTTP/2 connections. A remote attacker could possibly use this issue to cause the server to crash,     resulting in a denial of service. (CVE-2024-36387)

    Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly sent certain request URLs     with incorrect encodings to backends. A remote attacker could possibly use this issue to bypass     authentication. (CVE-2024-38473)

    Orange Tsai discovered that the Apache HTTP Server mod_rewrite module incorrectly handled certain     substitutions. A remote attacker could possibly use this issue to execute scripts in directories not     directly reachable by any URL, or cause a denial of service. Some environments may require using the new     UnsafeAllow3F flag to handle unsafe substitutions. (CVE-2024-38474, CVE-2024-38475, CVE-2024-39573)

    Orange Tsai discovered that the Apache HTTP Server incorrectly handled certain response headers. A remote     attacker could possibly use this issue to obtain sensitive information, execute local scripts, or perform     SSRF attacks. (CVE-2024-38476)

    Orange Tsai discovered that the Apache HTTP Server mod_proxy module incorrectly handled certain requests.
    A remote attacker could possibly use this issue to cause the server to crash, resulting in a denial of     service. (CVE-2024-38477)

    It was discovered that the Apache HTTP Server incorrectly handled certain handlers configured via AddType.
    A remote attacker could possibly use this issue to obtain source code. (CVE-2024-39884)

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.

According to its banner, the version of Apache running on the remote host is 2.4.x prior to 2.4.60. It is, therefore, affected by multiple vulnerabilities:

 - Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference, leading to a crash of the server process, degrading performance. (CVE-2024-36387)

 - SSRF in Apache HTTP Server on Windows allows to potentially leak NTML hashes to a malicious server via SSRF and malicious requests or content. (CVE-2024-38472)

 - Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect encoding to be sent to backend services, potentially bypassing authentication via crafted requests. (CVE-2024-38473)

 - Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to execute scripts in directories permitted by the configuration but not directly reachable by any URL or source disclosure of scripts meant to only to be executed as CGI. (CVE-2024-38474)

 - Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. (CVE-2024-38475)

 - Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are vulnerably to information disclosure, SSRF or local script execution via backend applications whose response headers are malicious or exploitable. (CVE-2024-38476)

 - Null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to crash the server via a malicious request. (CVE-2024-38477)

 - Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to cause unsafe RewriteRules to unexpectedly setup URL's to be handled by mod_proxy. (CVE-2024-39573)

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 httpd installed on the remote host is prior to 2.4.60. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2024-184-01 advisory.

    New httpd packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the httpd 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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the d7efc2ad-37af-11ef-b611-84a93843eb75 advisory.

    The Apache httpd project reports:
    DoS by Null pointer in websocket over HTTP/2 (CVE-2024-36387) (Low).
                Serving WebSocket protocol upgrades over a HTTP/2 connection could                 result in a Null Pointer dereference, leading to a crash of the server                 process, degrading performance.
    Proxy encoding problem (CVE-2024-38473) (Moderate).
                Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier                 allows request URLs with incorrect encoding to be sent to backend                 services, potentially bypassing authentication via crafted requests.
    Weakness with encoded question marks in backreferences                 (CVE-2024-38474) (Important). Substitution encoding issue in                 mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker                 to execute scripts in directories permitted by the configuration but                 not directly reachable by any URL or source disclosure of scripts                 meant to only to be executed as CGI.
    Weakness in mod_rewrite when first segment of substitution matches                 filesystem path (CVE-2024-38475) (Important). Improper escaping of                 output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows                 an attacker to map URLs to filesystem locations that are permitted to                 be served by the server but are not intentionally/directly reachable                 by any URL, resulting in code execution or source code disclosure.
                Substitutions in server context that use a backreferences or variables                 as the first segment of the substitution are affected. Some unsafe                 RewiteRules will be broken by this change and the rewrite flag                 UnsafePrefixStat can be used to opt back in once ensuring the                 substitution is appropriately constrained.
    may use exploitable/malicious backend application output to run local                 handlers via internal redirect (CVE-2024-38476) (Important).
                Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are                 vulnerable to information disclosure, SSRF or local script execution                 via backend applications whose response headers are malicious or                 exploitable.
    Crash resulting in Denial of Service in mod_proxy via a malicious                 request (CVE-2024-38477) (Important). Null pointer dereference in                 mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker                 to crash the server via a malicious request.
    mod_rewrite proxy handler substitution (CVE-2024-39573) (Moderate).
                Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier                 allows an attacker to cause unsafe RewriteRules to unexpectedly setup                 URL's to be handled by mod_proxy.

Tenable has extracted the preceding description block directly from the FreeBSD 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 version of Apache httpd installed on the remote host is prior to 2.4.60. It is, therefore, affected by multiple vulnerabilities as referenced in the 2.4.60 advisory.

  - Serving WebSocket protocol upgrades over a HTTP/2 connection could result in a Null Pointer dereference,     leading to a crash of the server process, degrading performance. (CVE-2024-36387)

  - SSRF in Apache HTTP Server on Windows allows to potentially leak NTML hashes to a malicious server via     SSRF and malicious requests or content Users are recommended to upgrade to version 2.4.60 which fixes this     issue. Note: Existing configurations that access UNC paths will have to configure new directive UNCList     to allow access during request processing. (CVE-2024-38472)

  - Encoding problem in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows request URLs with incorrect     encoding to be sent to backend services, potentially bypassing authentication via crafted requests. Users     are recommended to upgrade to version 2.4.60, which fixes this issue. (CVE-2024-38473)

  - Substitution encoding issue in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows attacker to     execute scripts in directories permitted by the configuration but not directly reachable by any URL or     source disclosure of scripts meant to only to be executed as CGI. Users are recommended to upgrade to     version 2.4.60, which fixes this issue. Some RewriteRules that capture and substitute unsafely will now     fail unless rewrite flag UnsafeAllow3F is specified. (CVE-2024-38474)

  - Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to     map URLs to filesystem locations that are permitted to be served by the server but are not     intentionally/directly reachable by any URL, resulting in code execution or source code disclosure.
    Substitutions in server context that use a backreferences or variables as the first segment of the     substitution are affected. Some unsafe RewiteRules will be broken by this change and the rewrite flag     UnsafePrefixStat can be used to opt back in once ensuring the substitution is appropriately constrained.
    (CVE-2024-38475)

  - Vulnerability in core of Apache HTTP Server 2.4.59 and earlier are vulnerably to information disclosure,     SSRF or local script execution via backend applications whose response headers are malicious or     exploitable. Users are recommended to upgrade to version 2.4.60, which fixes this issue. (CVE-2024-38476)

  - null pointer dereference in mod_proxy in Apache HTTP Server 2.4.59 and earlier allows an attacker to crash     the server via a malicious request. Users are recommended to upgrade to version 2.4.60, which fixes this     issue. (CVE-2024-38477)

  - Potential SSRF in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to cause unsafe     RewriteRules to unexpectedly setup URL's to be handled by mod_proxy. Users are recommended to upgrade to     version 2.4.60, which fixes this issue. (CVE-2024-39573)

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

ID	Name	Product	Family	Severity
202252	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : apache2 (SUSE-SU-2024:2405-1)	Nessus	SuSE Local Security Checks	high
202232	Debian dsa-5729 : apache2 - security update	Nessus	Debian Local Security Checks	critical
201986	Fedora 40 : httpd (2024-39f1a828ed)	Nessus	Fedora Local Security Checks	critical
201972	Ubuntu 20.04 LTS / 22.04 LTS / 23.10 / 24.04 LTS : Apache HTTP Server vulnerabilities (USN-6885-1)	Nessus	Ubuntu Local Security Checks	critical
114360	Apache 2.4.x < 2.4.60 Multiple Vulnerabilities	Web App Scanning	Component Vulnerability	critical
201303	Slackware Linux 15.0 / current httpd Multiple Vulnerabilities (SSA:2024-184-01)	Nessus	Slackware Local Security Checks	critical
201253	FreeBSD : Apache httpd -- Multiple vulnerabilities (d7efc2ad-37af-11ef-b611-84a93843eb75)	Nessus	FreeBSD Local Security Checks	critical
201198	Apache 2.4.x < 2.4.60 Multiple Vulnerabilities	Nessus	Web Servers	critical

Detections

Analytics

CVE-2024-38477

high

Tenable Plugins

high

critical

critical

critical

critical

critical

critical

critical