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AUSCERT External Security Bulletin Redistribution
ESB-2013.0534
Secure Shell Denial of Service Vulnerability
16 April 2013
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Adaptive Security Appliance (ASA) Software
Cisco Firewall Services Module (FWSM)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2013-1193
Original Bulletin:
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-1193
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Secure Shell Denial of Service Vulnerability
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-1193
CVE ID: CVE-2013-1193
Release Date: 2013 April 12 10:39 UTC (GMT)
Last Updated: 2013 April 12 10:39 UTC (GMT)
Summary
A vulnerability in the implementation of the Secure Shell (SSH)
function could allow an unauthenticated, remote attacker to deny SSH
management access to legitimate users.
The vulnerability is due to improper implementation of the logic to terminate
SSH sessions. An attacker could exploit this vulnerability by starting an SSH
session to the affected system. This vulnerability affects both SSHv1 and v2.
An exploit could allow the attacker to deny SSH management access to
legitimate users. The attacker can deny the access for 60 seconds, and then
the affected system will release the resource and users will be able to use
the SSH service again. However, repeated exploitation may lead to a denial of
service condition.
Affected Products
Product More Information CVSS
Cisco Adaptive Security Appliance
(ASA) Software CSCue63881, CSCuf51892 5.0/4.1
Cisco Firewall Services Module (FWSM) CSCue78671, CSCug26937 5.0/4.5
What Is a Cisco Security Notice?
The Cisco Product Security Incident Response Team (PSIRT) publishes Cisco
Security Notices to inform customers of low- to mid-level severity security
issues involving Cisco products.
Customers who wish to upgrade to a software version that includes fixes for
these issues should contact their normal support channels. Free software
updates will not be provided for issues that are disclosed through a Cisco
Security Notice.
For additional information about Cisco PSIRT publications, see the Cisco
Security Vulnerability Policy at
http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html
Customers Using Third-Party Support Organizations
Customers may have Cisco products that are provided or maintained through
prior or existing agreements with third-party support organizations, such as
Cisco Partners, authorized resellers, or service providers. For these
products, customers should consult their service providers or support
organizations to ensure that any applied workaround or fix is the most
appropriate in the intended network before it is deployed.
Disclaimer
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS
LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO
CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy, and may lack important information
or contain factual errors.
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