Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Squid-Cache | Squid | >= 2.0, < 2.7 |
| Debian | Debian Linux | 8.0 |
| Fedoraproject | Fedora | 29 |
| Opensuse | Leap | 15.0 |
| Canonical | Ubuntu Linux | 12.04 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlMailing ListThird Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8aPatchVendor Advisory
- https://github.com/squid-cache/squid/commits/v4PatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/07/msg00018.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://seclists.org/bugtraq/2019/Aug/42Mailing ListThird Party Advisory
- https://usn.ubuntu.com/4065-1/Third Party Advisory
- https://usn.ubuntu.com/4065-2/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4507Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlMailing ListThird Party Advisory
- http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
FAQ
What is CVE-2019-12529?
CVE-2019-12529 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 uu...
How severe is CVE-2019-12529?
CVE-2019-12529 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-12529?
Check the references section above for vendor advisories and patch information. Affected products include: Squid-Cache Squid, Debian Debian Linux, Fedoraproject Fedora, Opensuse Leap, Canonical Ubuntu Linux.