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AUSCERT External Security Bulletin Redistribution
ESB-2013.0162
libssh security update
6 February 2013
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AusCERT Security Bulletin Summary
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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
businesses and governments, helping to provide pre-emptive protection for
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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of its X-Force? research and development team ? an unequivocal world authority
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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