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Category:   Application (Security)  >   OpenSSL Vendors:   OpenSSL.org
OpenSSL DTLS Bug May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018810
SecurityTracker URL:  http://securitytracker.com/id/1018810
CVE Reference:   CVE-2007-4995   (Links to External Site)
Date:  Oct 12 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.9.8 to prior to 0.9.8f
Description:   A vulnerability was reported in OpenSSL. A remote user may be able to execute arbitrary code on the target system.

A remote user can send specially crafted DTLS data to trigger a flaw and potentially execute arbitrary code on the target system. The code will run with the privileges of the target service.

Only clients and servers that have DTLS enabled are affected.

SSL and TLS are not affected.

Andy Polyakov reported this vulnerability.

Impact:   A remote user may be able to execute arbitrary code on the target system.
Solution:   The vendor has issued a fixed version (0.9.8f).

The OpenSSL advisory is available at:

http://www.openssl.org/news/secadv_20071012.txt

Vendor URL:  www.openssl.org/news/secadv_20071012.txt (Links to External Site)
Cause:   Not specified
Underlying OS:   Linux (Any), UNIX (Any), Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 12 2007 (Red Hat Issues Fix) OpenSSL DTLS Bug May Let Remote Users Execute Arbitrary Code   (bugzilla@redhat.com)
Red Hat has released a fix for Red Hat Enterprise Linux 5.



 Source Message Contents

Date:  Fri, 12 Oct 2007 10:02:54 -0400
Subject:  OpenSSL


http://www.openssl.org/news/secadv_20071012.txt

OpenSSL Security Advisory [12-Oct-2007]

OpenSSL Vulnerabilities
-----------------------

Vulnerability A
---------------

Andy Polyakov discovered a flaw in OpenSSL's DTLS implementation which
could lead to the compromise of clients and servers with DTLS enabled.

DTLS is a datagram variant of TLS specified in RFC 4347 first
supported in OpenSSL version 0.9.8. Note that the vulnerabilities do
not affect SSL and TLS so only clients and servers explicitly using
DTLS are affected.

We believe this flaw will permit remote code execution.

This vulnerability is tracked as CVE-2007-4995.

Versions Affected
-----------------

All releases of 0.9.8 prior to 0.9.8f.

Recommendation
--------------

Either

a) Upgrade to the latest version of OpenSSL (0.9.8f) and rebuild all
packages using OpenSSL for DTLS.

or,

b) Disable DTLS.

Vulnerability B
---------------

Moritz Jodeit found an off-by-one error in SSL_get_shared_ciphers(), a
function that should normally only be used for logging or debugging.

The impact of this overflow is unclear.

This vulnerability is tracked as CVE-2007-5135.

Versions Affected
-----------------

All releases of 0.9.8 prior to 0.9.8f. All releases of 0.9.7 prior to
0.9.7m.

(Note that versions prior to 0.9.8d and 0.9.7l actually had a worse
problem in the same function).

Recommendation
--------------

a) Don't use SSL_get_shared_ciphers().

OR

b) Upgrade to 0.9.8f.

 
 


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