CVE-2019-12525

CRITICAL

Squid 3.3.9-3.5.28 and 4.x-4.7 - Out-of-bounds Write via Digest Authentication Header Parsing

Title source: llm
STIX 2.1

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 (12)

Core 12
Core References
Vendor Advisory x_refsource_confirm
http://www.squid-cache.org/Versions/v4/changesets/
Patch, Third Party Advisory x_refsource_confirm
https://github.com/squid-cache/squid/commits/v4
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4065-1/
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html
Third Party Advisory vendor-advisory x_refsource_ubuntu
https://usn.ubuntu.com/4065-2/
Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2019/dsa-4507
Mailing List, Third Party Advisory mailing-list x_refsource_bugtraq
https://seclists.org/bugtraq/2019/Aug/42
Mailing List, Third Party Advisory vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html
Mailing List, Third Party Advisory vendor-advisory x_refsource_suse
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html

Scores

CVSS v3 9.8
EPSS 0.5485
EPSS Percentile 98.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-787
Status published
Products (11)
canonical/ubuntu_linux 12.04
canonical/ubuntu_linux 16.04
canonical/ubuntu_linux 18.04
canonical/ubuntu_linux 19.04
debian/debian_linux 8.0
debian/debian_linux 9.0
debian/debian_linux 10.0
fedoraproject/fedora 29
opensuse/leap 15.0
opensuse/leap 15.1
... and 1 more
Published Jul 11, 2019
Tracked Since Feb 18, 2026