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CVE-2019-12521

MEDIUM

5.9

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.

CVE Details

CVSS v3.1 Score5.9

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published4/15/2020

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

canonical:ubuntu_linuxdebian:debian_linuxopensuse:leapsquid-cache:squid

Weaknesses (CWE)

CWE-193CWE-787

References

http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2020/04/23/1(cve@mitre.org)

https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt(cve@mitre.org)

https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html(cve@mitre.org)

https://security.gentoo.org/glsa/202005-05(cve@mitre.org)

https://security.netapp.com/advisory/ntap-20210205-0006/(cve@mitre.org)

https://usn.ubuntu.com/4356-1/(cve@mitre.org)

https://www.debian.org/security/2020/dsa-4682(cve@mitre.org)

http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2020/04/23/1(af854a3a-2127-422b-91ae-364da2661108)

https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html(af854a3a-2127-422b-91ae-364da2661108)

https://security.gentoo.org/glsa/202005-05(af854a3a-2127-422b-91ae-364da2661108)

https://security.netapp.com/advisory/ntap-20210205-0006/(af854a3a-2127-422b-91ae-364da2661108)

https://usn.ubuntu.com/4356-1/(af854a3a-2127-422b-91ae-364da2661108)

https://www.debian.org/security/2020/dsa-4682(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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