Bug 660642 (CVE-2010-4478)

Summary:	CVE-2010-4478 openssh: J-PAKE authentication bypass
Product:	[Other] Security Response	Reporter:	Tomas Hoger <thoger>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	jchadima, rcvalle, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Fixed In Version:		Doc Type:	Bug Fix
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Last Closed:	2010-12-07 13:05:11 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tomas Hoger 2010-12-07 13:03:26 UTC

Common Vulnerabilities and Exposures assigned an identifier CVE-2010-4478 to the following vulnerability:

OpenSSH 5.6 and earlier, when J-PAKE is enabled, does not properly validate the public parameters in the J-PAKE protocol, which allows remote attackers to bypass the need for knowledge of the shared secret, and successfully authenticate, by sending crafted values in each round of the protocol, a related issue to CVE-2010-4252.

References:
http://seb.dbzteam.org/crypto/jpake-session-key-retrieval.pdf
https://github.com/seb-m/jpake
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/jpake.c#rev1.5

Comment 1 Tomas Hoger 2010-12-07 13:05:11 UTC

As noted in Sébastien Martini's paper, J-PAKE support in OpenSSH is experimental work-in-progress.  It's not enabled in Red Hat Enterprise Linux and Fedora openssh packages.

Statement:

Not vulnerable. This issue did not affect the versions of openssh as shipped with Red Hat Enterprise Linux 4, 5, or 6.