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Oracle Solaris 11: CVE-2019-12521: Vulnerability in Squid

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Oracle Solaris 11: CVE-2019-12521: Vulnerability in Squid

Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:N/A:P)
Published
04/15/2020
Created
01/20/2021
Added
01/19/2021
Modified
02/17/2022

Description

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.

Solution(s)

  • oracle-solaris-11-4-upgrade-web-proxy-squid-4-11-11-4-22-0-1-69-4

References

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