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Bug 1536942 - (CVE-2018-1000027) CVE-2018-1000027 squid: Incorrect pointer handling in HTTP processing and certificate download can lead to denial of service
CVE-2018-1000027 squid: Incorrect pointer handling in HTTP processing and cer...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180119,repor...
: Security
Depends On: 1582301 1536940
Blocks: 1536944
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Reported: 2018-01-22 00:32 EST by Sam Fowler
Modified: 2018-11-01 11:39 EDT (History)
6 users (show)

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Fixed In Version: squid 3.5.27, squid 4.0.23
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Description Sam Fowler 2018-01-22 00:32:15 EST 
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 00:34:58 EST 
Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1536940]
Comment 2 Stefan Cornelius 2018-05-24 07:24:21 EDT 
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).
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