Cisco Security Advisory
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AV:R/AC:H/Au:NR/C:N/I:P/A:N/B:N/E:F/RL:O/RC:C
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Cisco CallManager versions 4.3(1) and prior contain a vulnerability that could allow an unauthenticated, remote attacker to bypass security restrictions and conduct cross-site scripting attacks.
This vulnerability exists due to insufficient sanitization of user-supplied input to the CallManager web interface search form. 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 code within a user's browser session.
A functional URL is publicly available.
Cisco confirmed this vulnerability in a security response and released updated software.
Attackers rely on user interaction to accomplish an exploit. An attacker must convince a user to follow a malicious URL, likely provided as part of an e-mail or other type of message. By following a malicious link, the attacker could execute arbitrary HTML code in the user's browser session. Because the attacker can use HTML elements to reference external Flash, scripting, or other active content, the attacker could likely run scripts within a user's browser, depending on the configuration. Such a script could recover recently submitted browser information or other confidential information.
Server-side input has been improved to prevent the injection of unauthorized code in later versions from the vendor.
The vendor also has indicated that this type of exploitation is currently blocked by the web application firewall on version 4.2(3)SR2 and higher.
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Cisco has released a security response for Cisco Bug ID CSCsi12374 at the following link: cisco-sr-20070523-ccm
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Administrators are advised to apply the appropriate software updates.
Administrators may consider using a filtering proxy or firewall to remove malicious characters and character sequences.
Users are advised not to open e-mail from untrusted sources. Users are advised to verify unexpected e-mail messages from trusted sources before opening them.
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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 2007-May-23
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