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CVE-2019-12525

9.8 · CRITICAL

An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.x through 4.7.

Published Jul 11, 2019CWE-787EPSS 24.40%

Overview

CVE-2019-12525 is a critical-severity vulnerability. It was published on July 11, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlReflists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlRefwww.squid-cache.org/Versions/v4/changesets/Refwww.squid-cache.org/Versions/v4/changesets/squid-4-7f73e9c5d17664b882ed32590e6af310c247f320.patchGitHubgithub.com/squid-cache/squid/commits/v4Reflists.debian.org/debian-lts-announce/2019/07/msg00018.htmlReflists.debian.org/debian-lts-announce/2020/07/msg00009.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/Refseclists.org/bugtraq/2019/Aug/42Refusn.ubuntu.com/4065-1/

How CyberStrike helps

Frequently asked questions

What is CVE-2019-12525?

CVE-2019-12525 is a critical-severity vulnerability. It was published on July 11, 2019 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2019-12525?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2019-12525?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-12525?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-12525 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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