Cisco Secure Access Control System contains a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting attacks. Updates are available.
A vulnerability in the web interface of Cisco Secure Access Control System (ACS) could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web interface of the affected system.
The vulnerability is due to insufficient input validation of a user-supplied value. An attacker could exploit this vulnerability by convincing the user to access a malicious link.
Cisco has confirmed this vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco ACS 18.104.22.168.3 and prior were vulnerable. Later releases of Cisco ACS may also be affected.
To exploit the vulnerability, the attacker may provide a link that directs a user to a malicious site and use misleading language or instructions to persuade the user to follow the provided link.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
Cisco has released a security notice at the following link: CVE-2013-3423
Customers should refer to Cisco bug ID CSCud75174 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit the vulnerability to execute arbitrary HTML or script code in the user's browser session in the security context of the affected site. An exploit could allow the attacker to obtain sensitive information, such as authentication cookies or recently submitted data.
The vulnerability is due to insufficient validation of user-supplied input processed by the affected software.
An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to visit a malicious web page that is designed to submit crafted input to the affected software. If successful, the attacker could execute arbitrary script code in the user's browser session under the context of an affected site.
Administrators are advised to apply the appropriate updates.
Users should verify that unsolicited links are safe to follow.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts should contact their Cisco support team for assistance in upgrading to a software version that includes fixes for this vulnerability. Cisco customers without contracts may contact the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at firstname.lastname@example.org for assistance.
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