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Cisco Security Notice

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)

Related Resources:

View related Alert


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

ProductMore InformationCVSS
Cisco Adaptive Security Appliance (ASA) SoftwareCSCue63881, CSCuf518925.0/4.1
Cisco Firewall Services Module (FWSM)CSCue78671, CSCug269375.0/4.5

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/web/about/security/psirt/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

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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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