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Category:   Application (VPN)  >   OpenSSL Vendors:   OpenSSL.org
OpenSSL TLS Handshake Bug Lets Remote Servers Crash the Connected Client
SecurityTracker Alert ID:  1020122
SecurityTracker URL:  http://securitytracker.com/id/1020122
CVE Reference:   CVE-2008-1672   (Links to External Site)
Date:  May 28 2008
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 0.9.8f, 0.9.8g
Description:   A vulnerability was reported in OpenSSL. A remote server can cause denial of service conditions on the target client.

A remote server can return specially crafted data to the connected client during a TLS handshake to cause the target client to crash.

This can be triggered when certain cipher suites are used and the remote server omits the 'Server Key exchange message' from the TLS handshake.

Codenomicon reported this vulnerability.

Impact:   A remote server can cause the connected client to crash.
Solution:   The vendor has issued a fix (0.9.8h).

The vendor's advisory is available at:

http://www.openssl.org/news/secadv_20080528.txt

Vendor URL:  www.openssl.org/news/secadv_20080528.txt (Links to External Site)
Cause:   State error
Underlying OS:   Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.


 Source Message Contents

Date:  Wed, 28 May 2008 05:40:10 -0400
Subject:  OpenSSL


http://www.openssl.org/news/secadv_20080528.txt

OpenSSL Security Advisory [28-Mar-2008]

Two moderate severity security flaws have been fixed in OpenSSL
0.9.8h.  The OpenSSL security team would like to thank Codenomicon for
reporting these issues.


OpenSSL Server Name extension crash
-----------------------------------

Testing using the Codenomicon TLS test suite discovered a flaw in the
handling of server name extension data in OpenSSL 0.9.8f and OpenSSL
0.9.8g.  If OpenSSL has been compiled using the non-default TLS server
name extensions, a remote attacker could send a carefully crafted
packet to a server application using OpenSSL and cause it to crash.
(CVE-2008-0891).

Please note this issue does not affect any other released versions of
OpenSSL, and does not affect versions compiled without TLS server name
extensions.

Users of OpenSSL 0.9.8f or 0.9.8g should update to the OpenSSL 0.9.8h
release which contains a patch to correct this issue.


OpenSSL Omit Server Key Exchange message crash
----------------------------------------------

Testing using the Codenomicon TLS test suite discovered a flaw if the
'Server Key exchange message' is omitted from a TLS handshake in
OpenSSL 0.9.8f and OpenSSL 0.9.8g.  If a client connects to a
malicious server with particular cipher suites, the server could cause
the client to crash.  (CVE-2008-1672).

Please note this issue does not affect any other released versions of
OpenSSL.

Users of OpenSSL 0.9.8f or 0.9.8g should update to the OpenSSL 0.9.8h
release which contains a patch to correct this issue.





 
 


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