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Cisco Security Notice

Cisco AnyConnect VPNAPI COM Buffer Overflow Vulnerability

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-5559
CVE ID: CVE-2013-5559
Release Date: 2013 November 1 18:36  UTC (GMT)
Last Updated: 2013 November 4 18:25  UTC (GMT)
Related Documents:    

Summary

A vulnerability in the Active Template Library (ATL) framework used by a component of the Cisco AnyConnect Secure Mobility Client could allow an unauthenticated, remote attacker to execute arbitrary commands with the privilege of the user executing the web browser.

The vulnerability is due to insufficient input validation when the ATL framework is called by the VPNAPI COM module. An attacker could exploit this vulnerability by persuading the a user with the Cisco AnyConnect Secure Mobility Client to visit a crafted HTML page. An exploit could allow the attacker to create a buffer overflow condition and possibly execute arbitrary code. Arbitrary code injection is theoretical and has not been proven.

Note: The COM component is not marked safe for scripting or initialization; therefore, a user would be prompted multiple times before the control would load.

Depending on the device operating system where Cisco AnyConnect Secure Mobility Client is installed, the command execution will be performed with the privilege of the user accessing the malicious HTML. This vulnerability affects Cisco AnyConnect Secure Mobility Client version 2.x only. Cisco AnyConnect Secure Mobility Client 3.x is not affected.

Cisco would like to thank Alex Nikitin and Jarrod Johnson from Ixia BreakingPoint for reporting this vulnerability.

Affected Products

ProductMore InformationCVSS
Cisco AnyConnect Secure Mobility ClientCSCuj581396.8/5.6

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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