Off-by-one Error Affecting squid:4/libecap-devel package, versions <0:1.0.1-2.module_el8.6.0+2741+01592ae8
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Test your applications- Snyk ID SNYK-ALMALINUX8-SQUID-5617017
- published 28 May 2023
- disclosed 3 Nov 2020
How to fix?
Upgrade AlmaLinux:8 squid:4/libecap-devel to version 0:1.0.1-2.module_el8.6.0+2741+01592ae8 or higher.
This issue was patched in ALSA-2020:4743.
NVD Description
Note: Versions mentioned in the description apply only to the upstream squid:4/libecap-devel package and not the squid:4/libecap-devel package as distributed by AlmaLinux.
See How to fix? for AlmaLinux:8 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.
References
- https://errata.almalinux.org/8/ALSA-2020-4743.html
- https://vulners.com/cve/CVE-2019-12521
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html
- http://www.openwall.com/lists/oss-security/2020/04/23/1
- https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
- https://security.gentoo.org/glsa/202005-05
- https://security.netapp.com/advisory/ntap-20210205-0006/
- https://usn.ubuntu.com/4356-1/
- https://www.debian.org/security/2020/dsa-4682