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CVE-2019-12529

Published: 11 July 2019

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.

Priority

Medium

CVSS 3 base score: 5.9

Status

Package Release Status
squid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Ignored
(reached end-of-life)
disco
Released (4.4-1ubuntu2.2)
precise Does not exist

trusty Does not exist

upstream
Released (4.8)
xenial Does not exist

Patches:
upstream: https://github.com/squid-cache/squid/commit/dd46b5417809647f561d8a5e0e74c3aacd235258 (v4)
squid3
Launchpad, Ubuntu, Debian
bionic
Released (3.5.27-1ubuntu1.3)
cosmic Does not exist

disco Does not exist

precise
Released (3.1.19-1ubuntu3.12.04.10)
trusty Does not exist

upstream Needed

xenial
Released (3.5.12-1ubuntu7.8)