What’s Vulnerable › Vulnerabilities

CVE-2019-12525

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 24.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-07-11 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Canonical Ubuntu Linux: 12.04, 16.04, 18.04, 19.04
• Debian Linux: 8.0, 9.0, 10.0
• Fedoraproject Fedora: 29
• openSUSE Leap: 15.0, 15.1
• Squid: from 3.3.9 through 3.5.28; from 4.0 through 4.7

References

• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.html
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.html
• http://www.squid-cache.org/Versions/v4/changesets/
• http://www.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patch
• https://github.com/squid-cache/squid/commits/v4
• https://lists.debian.org/debian-lts-announce/2019/07/msg00018.html
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
• https://seclists.org/bugtraq/2019/Aug/42
• https://usn.ubuntu.com/4065-1/
• https://usn.ubuntu.com/4065-2/
• https://www.debian.org/security/2019/dsa-4507

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