Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.11, 3.0.12, and 3.1.10, Rack::CommonLogger can be exploited by crafting input that includes newline characters to manipulate log entries. The supplied proof-of-concept demonstrates injecting malicious content into logs. When a user provides the authorization credentials via Rack::Auth::Basic, if success, the username will be put in env['REMOTE_USER'] and later be used by Rack::CommonLogger for logging purposes. The issue occurs when a server intentionally or unintentionally allows a user creation with the username contain CRLF and white space characters, or the server just want to log every login attempts. If an attacker enters a username with CRLF character, the logger will log the malicious username with CRLF characters into the logfile. Attackers can break log formats or insert fraudulent entries, potentially obscuring real activity or injecting malicious data into log files. Versions 2.2.11, 3.0.12, and 3.1.10 contain a fix.

The remote Debian 12 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-5886 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-5886-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     March 25, 2025                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : ruby-rack     CVE ID         : CVE-2025-25184 CVE-2025-27111 CVE-2025-27610

    Multiple security issues were found in Rack, an interface for developing     web applications in Ruby, which could result in log injection or     information disclosure.

    For the stable distribution (bookworm), these problems have been fixed in     version 2.2.13-1~deb12u1.

    We recommend that you upgrade your ruby-rack packages.

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

    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 Debian 11 host has a package installed that is affected by multiple vulnerabilities as referenced in the dla-4090 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4090-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Adrian Bunk     March 24, 2025                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : ruby-rack     Version        : 2.1.4-3+deb11u3     CVE ID         : CVE-2025-25184 CVE-2025-27111 CVE-2025-27610     Debian Bug     : 1098257 1099546 1100444

    Multiple vulnerabilities have been fixed in ruby-rack,     an interface for developing web applications in Ruby.

    CVE-2025-25184

        Log Injection in Rack::CommonLogger

    CVE-2025-27111

        Log Injection in Rack::Sendfile

    CVE-2025-27610

        Local file inclusion in Rack::Static

    For Debian 11 bullseye, these problems have been fixed in version     2.1.4-3+deb11u3.

    We recommend that you upgrade your ruby-rack packages.

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

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

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 Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7366-1 advisory.

    Nht Thi  discovered that Rack incorrectly handled certain usernames. A remote attacker could     possibly use this issue to perform CRLF injection. (CVE-2025-25184)

    Phm Quang Minh discovered that Rack incorrectly handled certain headers. A remote attacker could     possibly use this issue to perform log injection. (CVE-2025-27111)

    Phm Quang Minh discovered that Rack did not properly handle relative file paths. A remote attacker     could potentially exploit this to include local files that should have been inaccessible. (CVE-2025-27610)

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 SUSE Linux SLES15 / openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:0874-1 advisory.

    - CVE-2025-25184: Fixed escape sequence injection vulnerability in rack leading to possible log injection     (bsc#1237141)
    - CVE-2025-27111: Fixed escape sequence injection vulnerability in rack leading to possible log injection     (bsc#1238607)
    - CVE-2025-27610: Fixed improper sanitization of user-supplied paths (bsc#1239298)

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 openSUSE 15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:0858-1 advisory.

    - CVE-2025-27610: Fixed improper sanitization of user-supplied paths when serving files leading to local     file inclusion (bsc#1239298).
    - CVE-2025-25184: Fixed Rack::CommonLogger log entry manipulation (bsc#1237141).

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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.11, 3.0.12, and     3.1.10, Rack::CommonLogger can be exploited by crafting input that includes newline characters to     manipulate log entries. The supplied proof-of-concept demonstrates injecting malicious content into logs.
    When a user provides the authorization credentials via Rack::Auth::Basic, if success, the username will be     put in env['REMOTE_USER'] and later be used by Rack::CommonLogger for logging purposes. The issue occurs     when a server intentionally or unintentionally allows a user creation with the username contain CRLF and     white space characters, or the server just want to log every login attempts. If an attacker enters a     username with CRLF character, the logger will log the malicious username with CRLF characters into the     logfile. Attackers can break log formats or insert fraudulent entries, potentially obscuring real activity     or injecting malicious data into log files. Versions 2.2.11, 3.0.12, and 3.1.10 contain a fix.
    (CVE-2025-25184)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
233339	Debian dsa-5886 : ruby-rack - security update	Nessus	Debian Local Security Checks	medium
233303	Debian dla-4090 : ruby-rack - security update	Nessus	Debian Local Security Checks	medium
233300	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 24.10 : Rack vulnerabilities (USN-7366-1)	Nessus	Ubuntu Local Security Checks	medium
232756	SUSE SLES15 / openSUSE 15 Security Update : rubygem-rack (SUSE-SU-2025:0874-1)	Nessus	SuSE Local Security Checks	medium
232719	openSUSE 15 Security Update : rubygem-rack-1_6 (SUSE-SU-2025:0858-1)	Nessus	SuSE Local Security Checks	high
230824	Linux Distros Unpatched Vulnerability : CVE-2025-25184	Nessus	Misc.	high

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