CVEvulnerability
CVE-2019-12521
5.9 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2020-04-15
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 4.3 MEDIUM — AV:N/AC:M/Au:N/C:N/I:N/A:P
- Weaknesses
- CWE-193, CWE-787
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 configurations
• squid-cache squid (>= 3.0 <= 3.5.28)
• squid-cache squid (>= 4.0 <= 4.7)
• squid-cache squid (>= 5.0 <= 5.0.1)
• canonical ubuntu linux 16.04
• canonical ubuntu linux 18.04
• canonical ubuntu linux 19.10
• canonical ubuntu linux 20.04
• debian debian linux 9.0
• debian debian linux 10.0
• opensuse leap 15.1
Related
References
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2020/04/23/1 Mailing List, Patch, Third Party Advisory
- https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202005-05 Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210205-0006/ Third Party Advisory
- https://usn.ubuntu.com/4356-1/ Third Party Advisory
- 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
- http://www.openwall.com/lists/oss-security/2020/04/23/1 Mailing List, Patch, Third Party Advisory
- https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202005-05 Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210205-0006/ Third Party Advisory
- https://usn.ubuntu.com/4356-1/ Third Party Advisory
- https://www.debian.org/security/2020/dsa-4682 Third Party Advisory