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. Reference: http://www.squid-cache.org/Versions/v4/changesets/ https://github.com/squid-cache/squid/commits/v4 Upstream patches: squid-4 : http://www.squid-cache.org/Versions/v4/changesets/squid-4-409956536647b3a05ee1e367424a24ae6b8f13fd.patch squid-3.5 : http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-ec0d0f39cf28da14eead0ba5e777e95855bc2f67.patch
Created squid tracking bugs for this issue: Affects: fedora-all [bug 1730536]
External References: http://www.squid-cache.org/Advisories/SQUID-2019_3.txt
Mitigation: Remove 'auth_param digest ...' configuration settings from squid.conf.
upstream fixes : Squid 3.5: http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-ec0d0f39cf28da14eead0ba5e777e95855bc2f67.patch Squid 4: http://www.squid-cache.org/Versions/v4/changesets/squid-4-409956536647b3a05ee1e367424a24ae6b8f13fd.patch
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:2041 https://access.redhat.com/errata/RHSA-2020:2041
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:2040 https://access.redhat.com/errata/RHSA-2020:2040
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2019-12525