Bug 892700 (CVE-2012-6087)

Summary:	CVE-2012-6087 moodle (Amazon S3 module): Improper use of cURL API might lead to improper SSL certificate verification (MiTM)
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	gwync
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-04-05 16:16:38 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:	892701, 892702
Bug Blocks:

Description Jan Lieskovsky 2013-01-07 16:12:34 UTC

A security flaw was found in the way Moodle, a course management system (CMS), used (lib)cURL's CURLOPT_SSL_VERIFYHOST variable, when doing certificate validation (value of '1' meaning only check for the existence of a common name was used instead of value '2' - which also checks if the particular common name matches the requested hostname of the server). A rogue service could use this flaw to conduct man-in-the-middle (MiTM) attacks.

References:
[1] http://www.openwall.com/lists/oss-security/2013/01/02/1
[2] http://www.openwall.com/lists/oss-security/2013/01/03/1
[3] https://github.com/tpyo/amazon-s3-php-class/pull/36

Relevant upstream patch:
[4] https://github.com/tmuras/amazon-s3-php-class/commit/07bb73fe2ad2c74e0d1af395a391ddb8d0fcaa7c

Comment 1 Jan Lieskovsky 2013-01-07 16:14:59 UTC

This issue affects the versions of the moodle package, as shipped with Fedora release of 16 and 17. Please schedule an update.

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This issue affects the version of the moodle package, as shipped with Fedora EPEL 6. Please schedule an update.

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This issue did NOT affect the version of the moodle package, as shipped with Fedora EPEL 5 (it does not provide support for Amazon S3 module yet).

Comment 2 Jan Lieskovsky 2013-01-07 16:16:06 UTC

Created moodle tracking bugs for this issue

Affects: fedora-all [bug 892701]
Affects: epel-6 [bug 892702]

Comment 3 Gwyn Ciesla 2013-01-15 15:33:26 UTC

This appears to affect all rawhide and f18 as well, and the most recent 2.4.1, does it not?

Comment 4 Jan Lieskovsky 2013-01-15 16:29:21 UTC

(In reply to comment #3)

Hi Jon,

> This appears to affect all rawhide and f18 as well, and the most recent
> 2.4.1, does it not?

Yes, according to: http://git.moodle.org/gw?p=moodle.git;a=blob_plain;f=repository/s3/S3.php;hb=62b48ad7ada1e9b88c68ffcfa20d560e490b43cc this would affect most recent v.2.4.1 version too (thus rawhide and F18 too).

(got there from http://git.moodle.org/gw?p=moodle.git;a=tree;h=3097afdeb5e55c4ee82e7fe00be78fc6006ee209;hb=62b48ad7ada1e9b88c68ffcfa20d560e490b43cc link).