Out-of-bounds Write Affecting squid package, versions <4.11-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
4.62% (93rd percentile)

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  • Snyk IDSNYK-DEBIAN13-SQUID-5696213
  • published23 Apr 2020
  • disclosed15 Apr 2020

Introduced: 15 Apr 2020

CVE-2019-12521  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Debian:13 squid to version 4.11-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream squid package and not the squid package as distributed by Debian. See How to fix? for Debian:13 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