A remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This occurs because the attacker can overflow the nonce reference counter, which may result in Remote code execution if the pooled token credentials are freed.
Created squid tracking bugs for this issue: Affects: fedora-all [bug 1827564]
Upstream Fix: https://github.com/squid-cache/squid/pull/585
External References: http://www.squid-cache.org/Advisories/SQUID-2020_4.txt
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions Via RHSA-2020:2038 https://access.redhat.com/errata/RHSA-2020:2038
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Extended Update Support Via RHSA-2020:2039 https://access.redhat.com/errata/RHSA-2020:2039
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-2020-11945