CVE-2019-12525

critical

Description

An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7. When Squid is configured to use Digest authentication, it parses the header Proxy-Authorization. It searches for certain tokens such as domain, uri, and qop. Squid checks if this token's value starts with a quote and ends with one. If so, it performs a memcpy of its length minus 2. Squid never checks whether the value is just a single quote (which would satisfy its requirements), leading to a memcpy of its length minus 1.

References

https://www.debian.org/security/2019/dsa-4507

https://usn.ubuntu.com/4065-2/

https://usn.ubuntu.com/4065-1/

https://seclists.org/bugtraq/2019/Aug/42

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/

https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html

https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html

https://github.com/squid-cache/squid/commits/v4

http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch

http://www.squid-cache.org/Versions/v4/changesets/

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html

http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html

Details

Source: Mitre, NVD

Published: 2019-07-11

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical