Bug 1827563 (CVE-2020-11945)

Summary: CVE-2020-11945 squid: improper access restriction upon Digest Authentication nonce replay could lead to remote code execution
Product: [Other] Security Response Reporter: Marian Rehak <mrehak>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anon.amish, bnater, jonathansteffan, luhliari, pavlix, scorneli, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: squid 4.11, squid 5.0.2 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in Squid, where a remote attacker can replay a sniffed Digest Authentication nonce to gain access to resources that are otherwise forbidden. This issue occurs because the attacker can overflow the nonce reference counter, which results in remote code execution if the pooled token credentials are freed.
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-05-06 16:32:00 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1828361, 1828369, 1827564, 1828359, 1828363, 1828365, 1828367    
Bug Blocks: 1827553    

Description Marian Rehak 2020-04-24 08:19:57 UTC
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.

Comment 1 Marian Rehak 2020-04-24 08:20:26 UTC
Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1827564]

Comment 2 Marian Rehak 2020-04-24 08:20:44 UTC
Upstream Fix:

https://github.com/squid-cache/squid/pull/585

Comment 3 Stefan Cornelius 2020-04-24 12:13:54 UTC
External References:

http://www.squid-cache.org/Advisories/SQUID-2020_4.txt

Comment 8 errata-xmlrpc 2020-05-06 12:14:29 UTC
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

Comment 9 errata-xmlrpc 2020-05-06 13:24:25 UTC
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

Comment 10 errata-xmlrpc 2020-05-06 13:48:11 UTC
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

Comment 11 errata-xmlrpc 2020-05-06 13:48:35 UTC
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

Comment 12 Product Security DevOps Team 2020-05-06 16:32:00 UTC
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