A vulnerability was found in mod_auth_mellon before v0.14.2. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.

The remote Redhat Enterprise Linux 6 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - mod_auth_mellon: open redirect in logout url when using URLs with backslashes (CVE-2019-3877)

  - The am_read_post_data function in mod_auth_mellon before 0.11.1 does not check if the ap_get_client_block     function returns an error, which allows remote attackers to cause a denial of service (segmentation fault     and process crash) via a crafted POST data. (CVE-2016-2145)

  - The am_read_post_data function in mod_auth_mellon before 0.11.1 does not limit the amount of data read,     which allows remote attackers to cause a denial of service (worker process crash, web server deadlock, or     memory consumption) via a large amount of POST data. (CVE-2016-2146)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2019-3421 advisory.

    - Resolves: rhbz#1692471 - CVE-2019-3877 appstream/mod_auth_mellon: open                                redirect in logout url when using URLs with                                backslashes [rhel-8]
    - Resolves: rhbz#1692471 - CVE-2019-3877 appstream/mod_auth_mellon: open                                redirect in logout url when using URLs with                                backslashes [rhel-8]
    - Resolves: rhbz#1692457 - CVE-2019-3878 mod_auth_mellon: authentication                                bypass in ECP flow [rhel-8.1.0]

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

Note that Nessus has not tested for this issue 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 a vulnerability as referenced in the CESA-2019:3421 advisory.

  - mod_auth_mellon: open redirect in logout url when using URLs with backslashes (CVE-2019-3877)

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

An update for mod_auth_mellon is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The mod_auth_mellon module for the Apache HTTP Server is an authentication service that implements the SAML 2.0 federation protocol. The module grants access based on the attributes received in assertions generated by an IdP server.

Security Fix(es) :

* mod_auth_mellon: authentication bypass in ECP flow (CVE-2019-3878)

* mod_auth_mellon: open redirect in logout url when using URLs with backslashes (CVE-2019-3877)

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.

Bug Fix(es) :

* mod_auth_mellon Cert files name wrong when hostname contains a number (fixed in upstream package) (BZ#1697487)

Note that Tenable Network Security has attempted to extract the preceding description block directly from the corresponding Red Hat security advisory. Virtuozzo provides no description for VZLSA advisories. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4597-1 advisory.

    Franois Kooman discovered that mod_auth_mellon incorrectly handled cookies. An attacker could possibly     use this issue to cause a Cross-Site Session Transfer attack. (CVE-2017-6807)

    It was discovered that mod_auth_mellon incorrectly handled certain requests. An attacker could possibly     use this issue to redirect a user to a malicious URL. (CVE-2019-3877)

    It was discovered that mod_auth_mellon incorrectly handled certain requests. An attacker could possibly     use this issue to access sensitive information. (CVE-2019-3878)

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.

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2019:3421 advisory.

    The mod_auth_mellon module for the Apache HTTP Server is an authentication service that implements the     SAML 2.0 federation protocol. The module grants access based on the attributes received in assertions     generated by an IdP server.

    Security Fix(es):

    * mod_auth_mellon: open redirect in logout url when using URLs with backslashes (CVE-2019-3877)

    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 8.1 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 this issue but has instead relied only on the application's self-reported version number.

The remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has mod_auth_mellon packages installed that are affected by multiple vulnerabilities:

  - A vulnerability was found in mod_auth_mellon before     v0.14.2. An open redirect in the logout URL allows     requests with backslashes to pass through by assuming     that it is a relative URL, while the browsers silently     convert backslash characters into forward slashes     treating them as an absolute URL. This mismatch allows     an attacker to bypass the redirect URL validation logic     in apr_uri_parse function. (CVE-2019-3877)

  - A vulnerability was found in mod_auth_mellon. If Apache     is configured as a reverse proxy and mod_auth_mellon is     configured to only let through authenticated users (with     the require valid-user directive), adding special HTTP     headers that are normally used to start the special SAML     ECP (non-browser based) can be used to bypass     authentication. (CVE-2019-3878)

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

A vulnerability was found in a previous version of mod_auth_mellon. An open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function.(CVE-2019-3877)

A vulnerability was found in mod_auth_mellon. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.(CVE-2019-3878)

A vulnerability was found in mod_auth_mellon. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication. (CVE-2019-3878)

A vulnerability was found in mod_auth_mellon where an open redirect in the logout URL allows requests with backslashes to pass through by assuming that it is a relative URL, while the browsers silently convert backslash characters into forward slashes treating them as an absolute URL. This mismatch allows an attacker to bypass the redirect URL validation logic in apr_uri_parse function. (CVE-2019-3877)

New upstream release 0.14.2 which also fixes CVE-2019-3878 and CVE-2019-3877

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

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

  - mod_auth_mellon: authentication bypass in ECP flow     (CVE-2019-3878)

  - mod_auth_mellon: open redirect in logout url when using     URLs with backslashes (CVE-2019-3877)

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.

Security Fix(es) :

  - mod_auth_mellon: authentication bypass in ECP flow     (CVE-2019-3878)

  - mod_auth_mellon: open redirect in logout url when using     URLs with backslashes (CVE-2019-3877)

Bug Fix(es) :

  - mod_auth_mellon Cert files name wrong when hostname     contains a number (fixed in upstream package)

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2019:0766 advisory.

    The mod_auth_mellon module for the Apache HTTP Server is an authentication service that implements the     SAML 2.0 federation protocol. The module grants access based on the attributes received in assertions     generated by an IdP server.

    Security Fix(es):

    * mod_auth_mellon: authentication bypass in ECP flow (CVE-2019-3878)

    * mod_auth_mellon: open redirect in logout url when using URLs with backslashes (CVE-2019-3877)

    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.

    Bug Fix(es):

    * mod_auth_mellon Cert files name wrong when hostname contains a number (fixed in upstream package)     (BZ#1697487)

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 Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2019-0766 advisory.

    - Resolves: rhbz#1697488 - CVE-2019-3877 mod_auth_mellon: open redirect                                in logout url when using URLs with backslashes
    - Resolves: rhbz#1697488 - CVE-2019-3877 mod_auth_mellon: open redirect                                in logout url when using URLs with backslashes                                [rhel-7] [rhel-7.6.z]

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.

An update for mod_auth_mellon is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The mod_auth_mellon module for the Apache HTTP Server is an authentication service that implements the SAML 2.0 federation protocol. The module grants access based on the attributes received in assertions generated by an IdP server.

Security Fix(es) :

* mod_auth_mellon: authentication bypass in ECP flow (CVE-2019-3878)

* mod_auth_mellon: open redirect in logout url when using URLs with backslashes (CVE-2019-3877)

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.

Bug Fix(es) :

* mod_auth_mellon Cert files name wrong when hostname contains a number (fixed in upstream package) (BZ#1697487)

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3924-1 advisory.

    It was discovered that mod_auth_mellon incorrectly handled certain requests. An attacker could possibly     use this issue to redirect a user to a malicious URL. (CVE-2019-3877)

    It was discovered that mod_auth_mellon incorrectly handled certain requests. An attacker could possibly     use this issue to access sensitive information. (CVE-2019-3878)

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.

Several issues have been discovered in Apache module auth_mellon, which provides SAML 2.0 authentication.

  - CVE-2019-3877     It was possible to bypass the redirect URL checking on     logout, so the module could be used as an open redirect     facility.

  - CVE-2019-3878     When mod_auth_mellon is used in an Apache configuration     which serves as a remote proxy with the http_proxy     module, it was possible to bypass authentication by     sending SAML ECP headers.

ID	Name	Product	Family	Severity
199605	RHEL 6 : mod_auth_mellon (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	medium
195521	RHEL 6 : mod_auth_mellon (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	medium
180754	Oracle Linux 8 : mod_auth_mellon (ELSA-2019-3421)	Nessus	Oracle Linux Local Security Checks	medium
145579	CentOS 8 : mod_auth_mellon (CESA-2019:3421)	Nessus	CentOS Local Security Checks	medium
144266	Virtuozzo 7 : mod_auth_mellon / mod_auth_mellon-diagnostics (VZLSA-2019-0766)	Nessus	Virtuozzo Local Security Checks	high
141824	Ubuntu 16.04 LTS : mod_auth_mellon vulnerabilities (USN-4597-1)	Nessus	Ubuntu Local Security Checks	high
130538	RHEL 8 : mod_auth_mellon (RHSA-2019:3421)	Nessus	Red Hat Local Security Checks	medium
127286	NewStart CGSL CORE 5.04 / MAIN 5.04 : mod_auth_mellon Multiple Vulnerabilities (NS-SA-2019-0077)	Nessus	NewStart CGSL Local Security Checks	high
125287	Amazon Linux 2 : mod_auth_mellon (ALAS-2019-1200)	Nessus	Amazon Linux Local Security Checks	high
124653	Amazon Linux AMI : mod24_auth_mellon (ALAS-2019-1200)	Nessus	Amazon Linux Local Security Checks	high
124481	Fedora 30 : mod_auth_mellon (2019-2d8ee47f61)	Nessus	Fedora Local Security Checks	high
124448	EulerOS 2.0 SP5 : mod_auth_mellon (EulerOS-SA-2019-1321)	Nessus	Huawei Local Security Checks	high
124447	EulerOS 2.0 SP3 : mod_auth_mellon (EulerOS-SA-2019-1320)	Nessus	Huawei Local Security Checks	high
124446	EulerOS 2.0 SP2 : mod_auth_mellon (EulerOS-SA-2019-1319)	Nessus	Huawei Local Security Checks	high
124100	Scientific Linux Security Update : mod_auth_mellon on SL7.x x86_64 (20190416)	Nessus	Scientific Linux Local Security Checks	high
124099	RHEL 7 : mod_auth_mellon (RHSA-2019:0766)	Nessus	Red Hat Local Security Checks	high
124097	Oracle Linux 7 : mod_auth_mellon (ELSA-2019-0766)	Nessus	Oracle Linux Local Security Checks	high
124093	CentOS 7 : mod_auth_mellon (CESA-2019:0766)	Nessus	CentOS Local Security Checks	high
123573	Fedora 29 : mod_auth_mellon (2019-db1e9b3002)	Nessus	Fedora Local Security Checks	high
123503	Ubuntu 18.04 LTS : mod_auth_mellon vulnerabilities (USN-3924-1)	Nessus	Ubuntu Local Security Checks	high
123024	Debian DSA-4414-1 : libapache2-mod-auth-mellon - security update	Nessus	Debian Local Security Checks	high

Detections

Analytics

CVE-2019-3877

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Tenable Plugins

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