CVE-2019-12529

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.

• CWE-125

• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00053.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlMailing List, Third Party Advisory
• http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
• http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patchPatch, Vendor Advisory
• https://github.com/squid-cache/squid/commits/v4Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/07/msg00018.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
• https://seclists.org/bugtraq/2019/Aug/42Mailing List, Third 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 List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00056.htmlMailing List, Third Party Advisory
• http://www.squid-cache.org/Versions/v4/changesets/Vendor Advisory
• http://www.squid-cache.org/Versions/v4/changesets/squid-4-dd46b5417809647f561d8a5e0e74c3aacd235258.patchPatch, Vendor Advisory
• https://github.com/squid-cache/squid/commits/v4Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/07/msg00018.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/07/msg00009.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SPXN2CLAGN5QSQBTOV5IGVLDOQSRFNTZ/
• https://seclists.org/bugtraq/2019/Aug/42Mailing List, Third 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

Published

Jul 11, 2019

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2019-12523An issue was discovered in Squid before 4.9. When handling a…9.1
• CVE-2019-12524An issue was discovered in Squid through 4.7. When handling …9.8
• CVE-2019-12525An issue was discovered in Squid 3.3.9 through 3.5.28 and 4.…9.8
• CVE-2019-12526An issue was discovered in Squid before 4.9. URN response ha…9.8
• CVE-2019-12527An issue was discovered in Squid 4.0.23 through 4.7. When ch…8.8
• CVE-2019-12528An issue was discovered in Squid before 4.10. It allows a cr…7.5
• CVE-2019-1253An elevation of privilege vulnerability exists when the Wind…7.8
• CVE-2019-12530Incorrect access control was discovered in the stdonato Dash…
• CVE-2019-12532Improper access control in the Insyde software tools may all…7.8
• CVE-2019-12537An issue was discovered in Zoho ManageEngine AssetExplorer. …6.1
• CVE-2019-12538An issue was discovered in Zoho ManageEngine ServiceDesk Plu…
• CVE-2019-12539An issue was discovered in the Purchase component of Zoho Ma…6.1