CVE-2005-2242

Vulnerability

Cisco CallManager (CCM) versions 3.2 and earlier, 3.3 before 3.3(5), 4.0 before 4.0(2a)SR2b, and 4.1 before 4.1(3)SR1 are vulnerable to a denial of service condition. The vulnerability exists in the CTI Manager (ctimgr.exe) and CallManager (ccm.exe) components. An attacker can send crafted packets to these services, leading to excessive memory consumption and subsequent restart of the affected service. [1]

Exploitation

An attacker with network access to the affected Cisco CallManager system can exploit this vulnerability by sending specially crafted packets to the CTI Manager or CallManager services. No authentication is required. The attacker simply needs to send the malicious packets to the appropriate ports (typically TCP 2748 for CTI Manager and TCP 2000 for CallManager, though not specified in the description). The crafted packets trigger a memory leak or memory allocation error, causing the service to consume all available memory and eventually crash or restart. [1]

Impact

Successful exploitation results in a denial of service (DoS) condition. The affected service (CTI Manager or CallManager) will consume excessive memory and restart, disrupting voice communications and call processing. This can lead to complete loss of telephony services until the service recovers or is manually restarted. The impact is limited to availability; no data confidentiality or integrity is compromised. [1]

Mitigation

Cisco has released fixed versions: 3.3(5), 4.0(2a)SR2b, and 4.1(3)SR1. Users should upgrade to these or later versions. For versions 3.2 and earlier, no fix is mentioned; they are likely end-of-life and should be upgraded to a supported version. Workarounds may include restricting network access to the affected services via access control lists. The vulnerability is not listed on CISA's Known Exploited Vulnerabilities catalog as of the publication date. [1]