Cisco Security Agent versions prior to 220.127.116.110, 18.104.22.168, 22.214.171.124, and 126.96.36.199 contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges.
The vulnerability exists due to an input validation error in a Windows system driver. An unauthenticated, remote attacker could exploit this vulnerability to cause a buffer overflow by sending a malicious SMB request to an affected system. An exploit could allow the attacker to cause a crash of the affected system or execute arbitrary code with elevated privileges.
Cisco has confirmed this vulnerability and released updated software.
Indicators of Compromise
Cisco Security Agent versions prior to 188.8.131.520, 184.108.40.206, 220.127.116.11, and 18.104.22.168 are vulnerable.
This vulnerability exists due to insufficient input validation by a Windows system driver. An unauthenticated, remote attacker could exploit this vulnerability by sending a malicious request via TCP ports 139 or 445. These ports are used by the Microsoft Server Message Block protocol. When the malicious request is processed, the attacker's data could trigger a buffer overflow condition, resulting in memory corruption. The attacker could leverage the resulting memory corruption to cause a system panic, resulting in a crash of the system, or execute arbitrary code with elevated privileges.
This vulnerability affects both managed and standalone implementations of the Cisco Security Agent. Cisco IP Communications application servers or systems running the Cisco Security Manager contain standalone implementations of Cisco Security Agent.
The vendor indicates that this vulnerability was reported by a Chinese security firm. This report raises concerns because both governmental and business infrastructures are often significant users of the Cisco Security Agent. A remotely exploitable vulnerability such as this, one that likely affects a large number of highly sensitive systems, is a very attractive target and may garner significant interest from agencies or individuals perpetrating attacks. Public knowledge of the details of this vulnerability may place these sensitive systems at increased risk.
The vendor's CVSS score indicates that exploit code exists for this vulnerability. However, this code is not known to be publicly available at this time.
Administrators are advised to apply the appropriate update.
Administrators are advised to use tACLs to restrict access to TCP ports 139 and 445.
Administrators may consider creating a Cisco Security Agent rule to block TCP traffic to ports 139 and 445.
Administrators are advised to monitor critical system for signs of suspicious activity.
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-20071205-csa
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 firstname.lastname@example.org.
IntelliShield is re-releasing this alert to include common vulnerability identification information.
2007-December-24 19:16 GMT
Cisco Security Agent contains a buffer overflow vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition or execute arbitrary code. Updates are available.
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.