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
Link | Resource |
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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 |
Configurations
Configuration 1 (hide)
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Configuration 2 (hide)
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Configuration 3 (hide)
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Configuration 4 (hide)
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History
11 Feb 2021, 14:47
Type | Values Removed | Values Added |
---|---|---|
References | (CONFIRM) https://security.netapp.com/advisory/ntap-20210205-0006/ - Third Party Advisory | |
References | (SUSE) http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html - Mailing List, Third Party Advisory | |
References | (MLIST) http://www.openwall.com/lists/oss-security/2020/04/23/1 - Mailing List, Patch, Third Party Advisory | |
References | (MLIST) https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html - Mailing List, Third Party Advisory | |
CPE | cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* |
05 Feb 2021, 14:15
Type | Values Removed | Values Added |
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References |
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Information
Published : 2020-04-15 19:15
Updated : 2023-12-10 13:27
NVD link : CVE-2019-12521
Mitre link : CVE-2019-12521
CVE.ORG link : CVE-2019-12521
JSON object : View
Products Affected
squid-cache
- squid
debian
- debian_linux
opensuse
- leap
canonical
- ubuntu_linux