Cisco Security Advisory
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AV:N/AC:M/Au:N/C:N/I:P/A:N/E:U/RL:OF/RC:C
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Cisco IOS Software contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary HTML and script code in the user's browser session.
The vulnerability exists due to an input sanitization error in the embedded HTTP server. An unauthenticated, remote attacker could exploit this vulnerability by convincing a user to follow a malicious link. This action could allow the attacker to execute arbitrary HTML and script code in the user's browser session.
Cisco has confirmed this vulnerability and released updated software.
The vulnerability exists due to an error in the embedded HTTP server in Cisco IOS Software. Security best practices dictate that administrators disable this server when it is not in use. Administrators are advised to review their networks to determine the purposes of any Cisco IOS devices that are running the embedded HTTP server.
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Cisco has released a security response to address Cisco bug ID CSCsi13344 at the following link: cisco-sr-20090114-http
Vulnerable Products
Cisco IOS systems that run with the embedded HTTP server enabled may be vulnerable. Customers are advised to contact their support organizations to determine whether their software version is vulnerable.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to disable the HTTP server if it is not necessary for business operations. Reference the Disable Unused Services section of the Cisco Guide to Harden Cisco IOS Devices document for more information.
Administrators are advised to apply access control lists to restrict access to the HTTP server.
Users are advised not to follow unsolicited links. Users should verify the authenticity of unexpected links prior to following them.
The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software: cisco-amb-20060922-understanding-xss
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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 e-mail at tac@cisco.com.
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The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.0 Initial Release NA Final 2009-Jan-14
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