CVE-2019-12525

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 61.21% Top 5%
Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory fedoraproject.org Vendor Advisory debian.org Vendor Advisory opensuse.org Vendor Advisory opensuse.org Vendor Advisory squid-cache.org Vendor Advisory squid-cache.org
Affected: n/a n/a
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2019-12525?
CVE-2019-12525 has been scored as a critical severity vulnerability.
How to fix CVE-2019-12525?
To fix CVE-2019-12525, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-12525 being actively exploited in the wild?
It is possible that CVE-2019-12525 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~61% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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