CVE-2023-50269

Squid is a caching proxy for the Web. Due to an Uncontrolled Recursion bug in versions 2.6 through 2.7.STABLE9, versions 3.1 through 5.9, and versions 6.0.1 through 6.5, Squid may be vulnerable to a Denial of Service attack against HTTP Request parsing. This problem allows a remote client to perform Denial of Service attack by sending a large X-Forwarded-For header when the follow_x_forwarded_for feature is configured. This bug is fixed by Squid version 6.6. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
squid	24.04 LTS noble	Fixed 6.5-1ubuntu3
	23.10 mantic	Fixed 6.1-2ubuntu1.2
	23.04 lunar	Fixed 5.7-1ubuntu3.2
	22.04 LTS jammy	Fixed 5.7-0ubuntu0.22.04.3
	20.04 LTS focal	Fixed 4.10-1ubuntu1.9
	18.04 LTS bionic	Ignored end of standard support
	16.04 LTS xenial	Ignored end of standard support
	14.04 LTS trusty	Ignored end of standard support
squid3	24.04 LTS noble	Not in release
	23.10 mantic	Not in release
	23.04 lunar	Not in release
	22.04 LTS jammy	Not in release
	20.04 LTS focal	Not in release
	18.04 LTS bionic	Fixed 3.5.27-1ubuntu1.14+esm2 Ubuntu Pro
	16.04 LTS xenial	Fixed 3.5.12-1ubuntu7.16+esm3 Ubuntu Pro
	14.04 LTS trusty	Ignored end of standard support

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
squid	Upstream: http://www.squid-cache.org/Versions/v5/SQUID-2023_10.patch Upstream: http://www.squid-cache.org/Versions/v6/SQUID-2023_10.patch

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVE-2023-50269

Cvss 3 Severity Score

Status

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Patch details

Severity score breakdown

References

Related Ubuntu Security Notices (USN)

Other references