Bug 1770371 (CVE-2019-12523) - CVE-2019-12523 squid: Improper input validation in URI processor
Summary: CVE-2019-12523 squid: Improper input validation in URI processor
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-12523
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1770372 1771274 1771275
Blocks: 1770374
TreeView+ depends on / blocked
 
Reported: 2019-11-08 20:02 UTC by Pedro Sampaio
Modified: 2023-03-24 15:57 UTC (History)
6 users (show)

Fixed In Version: squid 4.9
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Clone Of:
Environment:
Last Closed: 2020-11-04 02:23:06 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:4743 0 None None None 2020-11-04 03:31:49 UTC

Description Pedro Sampaio 2019-11-08 20:02:30 UTC 
Due to improper input validation Squid is vulnerable to security bypass attacks. Attacker can gain access to restricted HTTP servers.

References:

http://www.squid-cache.org/Advisories/SQUID-2019_8.txt
Comment 1 Pedro Sampaio 2019-11-08 20:02:43 UTC 
Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1770372]
Comment 2 Huzaifa S. Sidhpurwala 2019-11-12 05:33:47 UTC 
Upstream patch: http://www.squid-cache.org/Versions/v4/changesets/squid-4-fbbdf75efd7a5cc244b4886a9d42ea458c5a3a73.patch
Comment 3 Huzaifa S. Sidhpurwala 2019-11-12 05:33:51 UTC 
External References:

http://www.squid-cache.org/Advisories/SQUID-2019_8.txt
Comment 7 Huzaifa S. Sidhpurwala 2020-07-07 03:25:43 UTC 
Mitigation:

Access to manager services can be prevented by enabling the Via header: (in /etc/squid/squid.conf)
~~~ 
via on
~~~
There are no reliable workarounds to prevent access to restricted upstream servers.
Comment 8 Product Security DevOps Team 2020-11-04 02:23:06 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-2019-12523
Comment 9 errata-xmlrpc 2020-11-04 03:31:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2020:4743 https://access.redhat.com/errata/RHSA-2020:4743
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