Heap-based Buffer Overflow Affecting squid-sysvinit package, versions *


Severity

Recommended
0.0
medium
0
10

Based on CentOS security rating.

Threat Intelligence

EPSS
4.62% (93rd percentile)

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  • Snyk IDSNYK-CENTOS7-SQUIDSYSVINIT-1996694
  • published26 Jul 2021
  • disclosed24 Apr 2020

Introduced: 24 Apr 2020

CVE-2019-12521  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

There is no fixed version for Centos:7 squid-sysvinit.

NVD Description

Note: Versions mentioned in the description apply only to the upstream squid-sysvinit package and not the squid-sysvinit package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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.

CVSS Scores

version 3.1