Bug 873262 (CVE-2012-5821)

Summary:	CVE-2012-5821 lynx: Does not verify that the server's certificate is signed by a trusted certification authority
Product:	[Other] Security Response	Reporter:	Jan Lieskovsky <jlieskov>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	kdudka
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:	2012-11-06 16:13:02 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:	873278
Bug Blocks:	873282

Description Jan Lieskovsky 2012-11-05 13:24:28 UTC

Common Vulnerabilities and Exposures assigned an identifier CVE-2012-5821 to the following vulnerability:

Lynx does not verify that the server's certificate is signed by a trusted certification authority, which allows man-in-the-middle attackers to spoof SSL servers via a crafted certificate, related to improper use of a certain GnuTLS function.

References:
[1] http://www.cs.utexas.edu/~shmat/shmat_ccs12.pdf
[2] https://crypto.stanford.edu/~dabo/pubs/abstracts/ssl-client-bugs.html
[3] http://www.sigsac.org/ccs/CCS2012/techprogram.shtml

Comment 1 Jan Lieskovsky 2012-11-05 13:44:53 UTC

Created lynx tracking bugs for this issue

Affects: fedora-all [bug 873278]

Comment 2 Kamil Dudka 2012-11-05 13:58:07 UTC

We build lynx against OpenSSL, not GnuTLS.  So this CVE does not apply, does it?

Comment 3 Jan Lieskovsky 2012-11-05 14:45:23 UTC

(In reply to comment #2)
> We build lynx against OpenSSL, not GnuTLS.  So this CVE does not apply, does
> it?

In all supported versions? (me didn't check)

Comment 4 Kamil Dudka 2012-11-05 15:44:36 UTC

Yes, lynx was built against OpenSSL in RHEL-3 already.

Comment 5 Jan Lieskovsky 2012-11-06 16:09:27 UTC

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

--

This issue did not affect the versions of the lynx package, as shipped with Fedora release of 16 and 17.

Comment 6 Jan Lieskovsky 2012-11-06 16:13:02 UTC

Statement:

Not vulnerable. This issue did not affect the versions of lynx as shipped with Red Hat Enterprise Linux 5 and 6 as they were not build against GnuTLS.