Your submission was sent successfully! Close

CVE-2019-12521

Published: 15 April 2020

An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.

Priority

Medium

CVSS 3 base score: 5.9

Status

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

eoan
Released (4.8-1ubuntu2.3)
focal
Released (4.10-1ubuntu1.1)
groovy
Released (4.10-1ubuntu2)
hirsute
Released (4.10-1ubuntu2)
precise Does not exist

trusty Does not exist

upstream
Released (4.11)
xenial Does not exist

squid3
Launchpad, Ubuntu, Debian
bionic
Released (3.5.27-1ubuntu1.6)
eoan Does not exist

focal Does not exist

groovy Does not exist

hirsute Does not exist

precise Ignored
(end of ESM support, was needs-triage)
trusty Does not exist

upstream Needs triage

xenial
Released (3.5.12-1ubuntu7.11)