CVE-2019-12521

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.

Link	Resource
https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt	Third Party Advisory
http://www.openwall.com/lists/oss-security/2020/04/23/1	Mailing List Patch
https://www.debian.org/security/2020/dsa-4682	Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html	Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202005-05	Third Party Advisory
https://usn.ubuntu.com/4356-1/	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html	Mailing List Third Party Advisory
https://security.netapp.com/advisory/ntap-20210205-0006/	Third Party Advisory

Configuration 1

cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:* cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*

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Published : 2020-04-15 07:15

Updated : 2021-07-21 11:39

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NVD link : CVE-2019-12521

Mitre link : CVE-2019-12521

No products.

CWE-193

Off-by-one Error

CWE-787