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CVE-2019-12521

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.


Affected Package


OS OS Version Package Name Package Version
Debian 12 squid 5.7-1
Debian 11 squid 4.13-10+deb11u1
Debian 10 squid 4.6-1+deb10u7
Debian 999 squid 5.7-1

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