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FreeBSD : www/varnish7 -- Request Smuggling Attack (89c668d5-2f80-11f0-9632-641c67a117d8)

high Nessus Plugin ID 235916

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 89c668d5-2f80-11f0-9632-641c67a117d8 advisory.

 The Varnish Development Team reports:
 A client-side desync vulnerability can be triggered in Varnish Cache and Varnish Enterprise. This vulnerability can be triggered under specific circumstances involving malformed HTTP/1 requests.
 An attacker can abuse a flaw in Varnish's handling of chunked transfer encoding which allows certain malformed HTTP/1 requests to exploit improper framing of the message body to smuggle additional requests. Specifically, Varnish incorrectly permits CRLF to be skipped to delimit chunk boundaries.

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

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

Solution

Update the affected packages.

See Also

https://varnish-cache.org/security/VSV00016.html

http://www.nessus.org/u?c596822c

Plugin Details

Severity: High

ID: 235916

File Name: freebsd_pkg_89c668d52f8011f09632641c67a117d8.nasl

Version: 1.1

Type: local

Published: 5/13/2025

Updated: 5/13/2025

Supported Sensors: Nessus

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:varnish7

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 5/12/2025

Vulnerability Publication Date: 5/12/2025