CVE-2019-12529

Description

An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.

References

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

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

http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patch

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

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

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

https://lists.fedoraproject.org/archives/list/[email protected]/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/

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

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

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

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

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

Details

Risk Information

CVSS v2

CVSS v3