Cisco Security Advisory: On May 14 Cisco issued a security advisory for Cisco Unified Communications Manager (formerly Cisco CallManager). Patches are now available to fix four denial of service (DoS) vulnerabilities all of which were discovered internally by Cisco, the company says. The following Cisco Unified Communications Manager (CUCM) services are affected: Certificate Trust List (CTL) Provider, Certificate Authority Proxy Function (CAPF), Session Initiation Protocol (SIP), Simple Network Management Protocol (SNMP) Trap.

The CTL vulnerability affects CUCM version 5.x. It is a memory consumption hole that occurs when a series of malformed TCP packets are received by a vulnerable CUCM system and may result in a DoS condition. The CTL Provider service is enabled by default. The Certificate Authority Proxy Function (CAPF) vulnerability affects versions 4.1, 4.2 and 4.3. When handling malformed input, the hole may result in a DoS condition. The SIP vulnerabilities involve one that makes use of a hole in SIP JOIN and two that attack SIP INVITE. One of the holes for SIP INVITE does not have a workaround. The bug is fixed in the next service release, i.e. 4.1(3)SR7, 4.2(3)SR4, 4.3(2), 5.1(3) and 6.1(1).

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