A vulnerability in the Representational State Transfer (REST) interface of the Cisco Unified Communications Manager IM and Presence Service could allow an unauthenticated, remote attacker to cause a partial denial of service (DoS) condition because the Cisco Session Initiation Protocol (SIP) proxy service can unexpectedly restart. The vulnerability is due to lack of proper input validation of the HTTP request when it is sent to the REST interface. An attacker could exploit this vulnerability by sending a crafted HTTP request to the REST interface of the affected application. An exploit could allow the attacker to cause a partial DoS condition because the Cisco SIP proxy service can unexpectedly restart. Cisco has confirmed the vulnerability; however, software updates are not available. To exploit the vulnerability, an unauthenticated attacker must reach the REST interface and send a crafted HTTP request to the device. This requirement may reduce 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.
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.
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.
| Version | Description | Section | Status | Date |
| 1.0 | Initial Release | NA | Final | 2015-Oct-02 |
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy, and may lack important information or contain factual errors. The information in this document is intended for end-users of Cisco products.
Vulmon