Ubuntu 23.10 : Rack vulnerabilities (USN-6689-1)

medium Nessus Plugin ID 191925


The remote Ubuntu host is missing one or more security updates.


The remote Ubuntu 23.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-6689-1 advisory.

- Rack is a modular Ruby web server interface. Carefully crafted Range headers can cause a server to respond with an unexpectedly large response. Responding with such large responses could lead to a denial of service issue. Vulnerable applications will use the `Rack::File` middleware or the `Rack::Utils.byte_ranges` methods (this includes Rails applications). The vulnerability is fixed in and (CVE-2024-26141)

- Rack is a modular Ruby web server interface. Carefully crafted headers can cause header parsing in Rack to take longer than expected resulting in a possible denial of service issue. Accept and Forwarded headers are impacted. Ruby 3.2 has mitigations for this problem, so Rack applications using Ruby 3.2 or newer are unaffected. This vulnerability is fixed in,,, and (CVE-2024-26146)

- The Ruby on Rails advisory describes this vulnerability as follows: (CVE-2023-27539)

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


Update the affected ruby-rack package.

See Also


Plugin Details

Severity: Medium

ID: 191925

File Name: ubuntu_USN-6689-1.nasl

Version: 1.0

Type: local

Agent: unix

Published: 3/12/2024

Updated: 3/12/2024

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information


Risk Factor: Low

Score: 2.4


Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2024-26141


Risk Factor: Medium

Base Score: 5.8

Temporal Score: 5.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:23.10, p-cpe:/a:canonical:ubuntu_linux:ruby-rack

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 3/12/2024

Vulnerability Publication Date: 3/24/2023

Reference Information

CVE: CVE-2023-27539, CVE-2024-26141, CVE-2024-26146

USN: 6689-1