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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 Software


CPE Name Name Version
squid-cache:squid squid-cache squid 3.5.28
squid-cache:squid squid-cache squid 4.7
squid-cache:squid squid-cache squid 5.0.1
canonical:ubuntu_linux canonical ubuntu linux 16.04
canonical:ubuntu_linux canonical ubuntu linux 18.04
canonical:ubuntu_linux canonical ubuntu linux 19.10
canonical:ubuntu_linux canonical ubuntu linux 20.04
debian:debian_linux debian debian linux 9.0
debian:debian_linux debian debian linux 10.0
opensuse:leap opensuse leap 15.1

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