CVE-2019-12529

Publication date 11 July 2019

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
squid	19.04 disco	Fixed 4.4-1ubuntu2.2
	18.10 cosmic	Ignored end of life
	18.04 LTS bionic	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
squid3	19.04 disco	Not in release
	18.10 cosmic	Not in release
	18.04 LTS bionic	Fixed 3.5.27-1ubuntu1.3
	16.04 LTS xenial	Fixed 3.5.12-1ubuntu7.8
	14.04 LTS trusty	Not in release

Notes

mdeslaur

as of 2019-07-12, no equivalent fix in 3.5.x tree

Patch details

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

Package	Patch details
squid	Upstream: dd46b54

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N