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 Access Control System Help index page of Cisco 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 parameter. An attacker could exploit this vulnerability by convincing the user to access a malicious link.
Cisco has confirmed the vulnerability in a security notice and released software updates.
At the time this alert was first published, Cisco Secure Access Control System versions 5.3 and 5.4 were vulnerable. Other versions of Cisco Secure Access Control System 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 has released a security notice at the following link: CVE-2013-3421
Customers should refer to Cisco Bug ID CSCud75170 for the most complete list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to conduct cross-site scripting attacks, allowing the attacker to gain access to sensitive browser-based information.
The vulnerability is due to improper validation of user-supplied input to parameters used by the affected application.
An unauthenticated, remote attacker could exploit this vulnerability by convincing a targeted user to follow a link designed to submit malicious input to the vulnerable parameters. The application may return the malicious parameters to the user within the security context of the affected application, allowing the attacker to execute arbitrary script or HTML code in the user's browser.
Administrators are advised to apply the appropriate updates.
Users are advised not to open email messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in email messages are safe, they are advised not to open them.
Administrators are advised to monitor affected systems.
Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at firstname.lastname@example.org.
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