Bug 1202406 – CVE-2015-1787 openssl: segmentation fault in client authentication with empty CKE and DHE

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Bug 1202406 - (CVE-2015-1787) CVE-2015-1787 openssl: segmentation fault in client authentication with empty CKE and DHE

Summary:	CVE-2015-1787 openssl: segmentation fault in client authentication with empty...

Status:	CLOSED NOTABUG

Aliases:	CVE-2015-1787

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20150319,repor...
Keywords:	Security

Depends On:
Blocks:	1202442
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Reported:	2015-03-16 10:43 EDT by Martin Prpič
Modified:	2015-03-19 11:44 EDT (History)
CC List:	2 users (show)

See Also:
Fixed In Version:	openssl 1.0.2a
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-03-17 23:38:36 EDT
Type:	---
Regression:	---
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Documentation:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Martin Prpič 2015-03-16 10:43:41 EDT

If client authentication is used, then a server can crash with a segmentation fault in the event of a DHE ciphersuite being selected and a zero length ClientKeyExchange (CKE) message being sent by the client. This could be exploited in a denial of service attack.

This issue affects OpenSSL version 1.0.2, and is fixed in version 1.0.2a.

Acknowledgements:

Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges Matt Caswell of the OpenSSL development team as the original reporter.

Comment 1 Huzaifa S. Sidhpurwala 2015-03-17 23:37:22 EDT

Statement:

This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 5, 6, and 7.

Comment 2 Martin Prpič 2015-03-19 10:34:24 EDT

External References:

https://openssl.org/news/secadv_20150319.txt
https://access.redhat.com/articles/1384453

Comment 3 Tomas Hoger 2015-03-19 11:44:37 EDT

Upstream commit:

https://git.openssl.org/?p=openssl.git;a=commitdiff;h=b19d8143212ae5fbc9cebfd51c01f802fabccd33

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