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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0162
                          libssh security update
                              6 February 2013

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libssh
Publisher:         IBM
Operating System:  UNIX variants (UNIX, Linux, OSX)
                   Windows
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-0176  

Original Bulletin: 
   http://xforce.iss.net/xforce/xfdb/81595

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libssh publickey_from_privatekey() function denial of service 

libssh-publickeyfromprivatekey-dos (81595) 

The risk level is classified as Medium Risk

Description:

libssh is vulnerable to a denial of service, caused by a NULL pointer 
dereference error when processing "Client: Diffie-Hellman Key Exchange Init" 
packet. A remote attacker could exploit this vulnerability to cause the 
application to crash.

*CVSS:

Base Score: 		7.8 
Access Vector: 		Network Access 
Complexity: 		Low 
Authentication: 	None 
Confidentiality Impact: None 
Integrity Impact: 	None 
Availability Impact: 	Complete

Temporal Score: 	6.8 
Exploitability: 	High 
Remediation Level: 	Official-Fix 
Report Confidence: 	Confirmed

Consequences:

Denial of Service

Remedy:

Upgrade to the latest version of libssh (0.5.4 or later), available from the 
libssh Web site. See References.

References:

libssh Web Site: libssh
http://www.libssh.org/2013/01/22/libssh-0-5-4-security-release/

Red Hat Bugzilla Bug 894407: CVE-2013-0176 libssh: NULL dereference leads to 
denial of service. 
https://bugzilla.redhat.com/show_bug.cgi?id=894407
 
BID-57571: libssh CVE-2013-0176 Denial of Service Vulnerability 
http://www.securityfocus.com/bid/57571

CVE-2013-0176: ** RESERVED ** 
This candidate has been reserved by an organization or individual that will 
use it when announcing a new security problem. When the candidate has been 
publicized, the details for this candidate will be provided.
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0176

Platforms Affected:

    libssh libssh 0.5.3

Reported:

Jan 22, 2013

The information within this database may change without notice. Use of this 
information constitutes acceptance for use in an AS IS condition. There are NO
warranties, implied or otherwise, with regard to this information or its use.
Any use of this information is at the user's risk. In no event shall the 
author/distributor (IBM Internet Security Systems X-Force) be held liable for
any damages whatsoever arising out of or in connection with the use or spread
of this information.

For corrections or additions please email xforce@us.ibm.com

* According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard 
designed to convey vulnerability severity and help to determine urgency and 
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY 
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT 
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. The information within this
database may change without notice. Use of this information constitutes 
acceptance for use in an AS IS condition. There are NO warranties, implied or
otherwise, with regard to this information or its use. Any use of this 
information is at the user's risk. In no event shall IBM be held liable for 
any damages whatsoever arising out of or in connection with the use or spread
of this information. About IBM Internet Security Systems IBM Internet Security
Systems is a trusted security advisor to thousands of the world's leading 
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networks, desktops and servers. The IBM Proventia? integrated security 
platform is designed to automatically protect against both known and unknown 
threats, helping to keep networks up and running and shield customers from 
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in vulnerability and threat research. The IBM Internet Security Systems 
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and Professional Security Services. For more information, visit the IBM 
Internet Security Systems Web site at www.iss.net or call 800-776-2362.

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