Bug 1218118 (CVE-2015-3455)

Summary:	CVE-2015-3455 squid: incorrect X509 server certificate validation (SQUID-2015:1)
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	henrik, jonathansteffan, jrusnack, luhliari, psimerda, thozza
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	squid 3.5.4, squid 3.4.13, squid 3.3.14, squid 3.2.14	Doc Type:	Bug Fix
Doc Text:	It was found that Squid configured with client-first SSL-bump did not correctly validate X.509 server certificate host name fields. A man-in-the-middle attacker could use this flaw to spoof a Squid server using a specially crafted X.509 certificate.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-20 04:58:35 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:	1218119, 1233265
Bug Blocks:	1210268, 1218121

Description Martin Prpič 2015-05-04 08:47:25 UTC

It was found that when Squid was configured with client-first SSL-bump it did not correctly validate X509 server certificate domain / host name fields. A man-in-the-middle attacker could use this flaw to spoof a Squid server using a specially crafted X.509 certificate.

This flaw is only exploitable Squid is configured to perform SSL Bumping with the "client-first" or "bump" mode of operation. Sites that do not use SSL-Bump are not vulnerable.

This flaw is fixed in Squid versions 3.5.4, 3.4.13, 3.3.14, and 3.2.14. All Squid-2.x, 3.0 and 3.1 are not vulnerable to this flaw.

External References:

http://www.squid-cache.org/Advisories/SQUID-2015_1.txt

Comment 1 Martin Prpič 2015-05-04 08:48:31 UTC

Statement:

This issue did not affect the versions of squid as shipped with Red Hat Enterprise Linux 5 and 6.

Comment 2 Martin Prpič 2015-05-04 08:48:56 UTC

Created squid tracking bugs for this issue:

Affects: fedora-all [bug 1218119]

Comment 4 errata-xmlrpc 2015-11-19 12:20:36 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:2378 https://rhn.redhat.com/errata/RHSA-2015-2378.html

Comment 5 Fedora Update System 2016-05-06 19:54:34 UTC

libecap-1.0.0-1.fc22, squid-3.5.10-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.