Cisco Unified Presence Server contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available.
Description
Cisco Unified Presence Server contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability is due to the improper processing of crafted packets by the affected system. An unauthenticated, remote attacker could exploit this vulnerability by sending a series of crafted packets via Session Initiation Protocol (SIP) TCP port 5060 to the targeted device. Processing the crafted packets could cause an increase in CPU utilization on the system that could lead to a disruption of services, resulting in a DoS condition.
Cisco has confirmed this vulnerability and software updates are available.
Warning Indicators
Cisco Unified Presence Server versions 8.6, 9.0, and 9.1 are vulnerable.
IntelliShield Analysis
To exploit the vulnerability, an attacker would likely need access to an internal, trusted network to send crafted packets to the targeted system, decreasing the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available.
An unauthenticated, remote attacker could exploit this vulnerability to cause high CPU utilization on an affected device, resulting in a DoS condition.
Technical Information
The vulnerability is due to the improper processing of crafted packets by the affected system.
An unauthenticated, remote attacker could exploit this vulnerability by sending a series of crafted packets via TCP port 5060 to a targeted device. Processing the crafted packets could cause an increase in CPU utilization on the system that could lead to a disruption of services, resulting in a DoS condition.
Safeguards
Administrators are advised to apply the appropriate updates.
Administrators may consider using a solid firewall strategy to filter traffic from untrusted sources on TCP port 5060.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
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 e-mail at tac@cisco.com for assistance.
Signatures
Cisco Systems Cisco Intrusion Prevention System (IPS) 6.0
The security vulnerability applies to the following combinations of products.
Primary Products:
Cisco
Cisco Unified Communications Manager IM and Presen
9.0 (1) | 9.1 (1)
Cisco
Cisco Unified Presence Server
8.6 .4
Associated Products:
N/A
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