Bug 1536942 (CVE-2018-1000027)

Summary: CVE-2018-1000027 squid: Incorrect pointer handling in HTTP processing and certificate download can lead to denial of service
Product: [Other] Security Response Reporter: Sam Fowler <sfowler>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bnater, code, jenander, jonathansteffan, luhliari, scorneli, sfowler, thozza, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: squid 3.5.28, squid 4.0.23 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-03-31 22:32:03 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1536940, 1582301    
Bug Blocks: 1536944    

Description Sam Fowler 2018-01-22 05:32:15 UTC
Due to incorrect pointer handling, Squid versions 3.x (prior to 3.5.27) and 4.x (prior to 4.0.23) are vulnerable to a denial of service attack when processing HTTP messages or downloading intermediate CA certificates. This problem allows a remote client delivering certain HTTP requests in conjunction with certain trusted server responses to trigger a denial of service for all clients accessing the Squid service.

Upstream Advisory:
http://www.squid-cache.org/Advisories/SQUID-2018_2.txt

Upstream Patches:
http://www.squid-cache.org/Versions/v3/3.5/changesets/SQUID-2018_2.patch
http://www.squid-cache.org/Versions/v4/changesets/SQUID-2018_2.patch

Comment 1 Sam Fowler 2018-01-22 05:34:58 UTC
Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1536940]

Comment 2 Stefan Cornelius 2018-05-24 11:24:21 UTC
Mitigation:

A workaround for this issue is to set the "log_uses_indirect_client off" configuration directive in the squid configuration file (for example /etc/squid/squid.conf).

Comment 9 errata-xmlrpc 2020-03-31 19:19:55 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1068 https://access.redhat.com/errata/RHSA-2020:1068

Comment 10 Product Security DevOps Team 2020-03-31 22:32:03 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-2018-1000027