Cisco Wednesday issued two separate security alerts concerning its unified communications products – the third UC-related alert of this year. One of the alerts issued this week concern flaws in Cisco’s Unified IP Phone models, specifically related to the company’s Skinny Call Control Protocol (SCCP, or “Skinny”) and Session Initiation Protocol (SIP), while the other relates to an SQL Injection attack that could affect Cisco’s Unified Communications Manager – formerly CallManager.
According to Cisco, a number of its IP phones contain multiple overflow and denial-of-service vulnerabilities. Certain phones running SCCP and/or SIP firmware are vulnerable (see the list at the Cisco advisory). SCCP- and SIP-based phones contain a buffer overflow vulnerability in the handling of DNS responses. A specially-crafted DNS response may be able to trigger a buffer overflow and execute arbitrary code on a vulnerable phone, says Cisco. The hole is fixed in SCCP firmware version 8.0(8) and SIP firmware version 8.8(0).