Cisco Unified Presence contains a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are not available.
A vulnerability in the web framework of Cisco Unified Presence could allow an unauthenticated, remote attacker to cause an increase in memory utilization.
The vulnerability is due to improper handling of memory allocation when the affected system is flooded with malformed TCP packets. An attacker could exploit this vulnerability by sending malformed TCP packets to the affected system. An exploit could allow the attacker to cause an increase in memory utilization. Memory utilization does not return to a normal state when the attack is terminated. A reboot is of the system is required to restore free memory.
Cisco has confirmed the vulnerability in a security notice; however, software updates are not available.
At the time this alert was first published, Cisco Unified Presence versions 9.5 and prior were vulnerable. Later versions of Cisco Unified Presence may also be affected.
To exploit the vulnerability, an attacker would likely need access to an internal, trusted network to send malformed TCP packets to the targeted system, decreasing the likelihood of a successful exploit.
Customers are advised to review the bug report in the "Vendor Announcements" section for a current list of affected versions.
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 to cause an increase in memory utilization on a targeted system. If an exploit is successful, a reboot of the vulnerable device is require to restore free memory, resulting in a denial of service (DoS) condition.
The vulnerability is due to improper handling of memory allocation when the affected system is flooded with malformed TCP packets.
An unauthenticated, remote attacker could exploit this vulnerability by sending malformed TCP packets to the affected system. If successful, the attacker could cause excessive memory utilization on the targeted device, which will not return to a normal state when the attack is terminated. For the targeted system to restore free memory, a reboot is required, resulting in a DoS condition.
Administrators are advised to contact the vendor regarding future updates and releases.
Administrators are advised to allow only trusted users to have network access.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators can help protect affected systems from external attacks by using a solid firewall strategy.
Administrators are advised to monitor affected systems.
The security vulnerability applies to the following combinations of products.
Cisco Unified Presence Server
9.0 Base | 9.5 Base
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.