Bug 623483 (CVE-2010-2939)

Summary:	CVE-2010-2939 openssl: double-free vulnerability in ssl3_get_key_exchange()
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	unspecified	CC:	bressers, tmraz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2010-08-12 16:34:07 UTC	Type:	---
Regression:	---	Mount Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Vincent Danen 2010-08-11 21:41:54 UTC

George Guninski reported [1] a double-free flaw in openssl's client implementation that could lead to a crash when ECDH is used.  It was reported against 1.0.0a but the code being patched [2] to correct the flaw has also been identified in 0.9.8 [3].

[1] http://marc.info/?l=openssl-dev&m=128118163216952&w=2
[2] http://marc.info/?l=openssl-dev&m=128128256314328&w=2
[3] http://article.gmane.org/gmane.comp.security.oss.general/3298

Comment 1 Vincent Danen 2010-08-11 21:44:01 UTC

I'm not 100% sure of the impact here as it looks like it might just be in the openssl client.  I don't know if this code is used by other clients linked to the openssl libraries or not, so at this point cannot say if other applications are impacted by this.

Comment 2 Tomas Mraz 2010-08-11 22:10:24 UTC

Except this code is not compiled in on our openssl - no ECC support there.

Comment 3 Vincent Danen 2010-08-12 04:03:30 UTC

ECC or ECDH?  So where this problem falls, we don't compile that support into any version of openssl we provide?

Comment 4 Tomas Mraz 2010-08-12 07:20:08 UTC

Yes, it's in #ifndef OPENSSL_NO_ECDH. And the ECDH is not even in the source tarball due to patent concerns with ECC.

Comment 6 Vincent Danen 2010-08-12 16:34:07 UTC

Statement:

This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 3, 4, or 5 as they did not include support for ECDH.