Due to an input validation bug Squid is vulnerable to a Denial of Service against all clients using the proxy. This problem allows a malicious server in collaboration with a trusted client to consume arbitrarily large amounts of memory on the server running Squid. Lack of available memory resources impacts all services on the machine running Squid. Once initiated the DoS situation will persist until Squid is shutdown.
Upstream security advisory:
Created squid tracking bugs for this issue:
Affects: fedora-all [bug 1963391]
This flaw exists due to a memory leak when processing URN resource identifiers in urnParseReply() in src/urn.cc. The bug was fixed by releasing the temporary buffer at the end of the function.
Upstream pull request:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 8
Via RHSA-2021:4292 https://access.redhat.com/errata/RHSA-2021:4292
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):