CVE-2015-0612 in Unity Connection
Summary
by MITRE
The Connection Conversation Manager (aka CuCsMgr) process in Cisco Unity Connection 8.5 before 8.5(1)SU6, 8.6 before 8.6(2a)SU4, and 9.x before 9.1(2)SU2, when SIP trunk integration is enabled, allows remote attackers to cause a denial of service (SIP outage) via a crafted UDP packet, aka Bug ID CSCuh25062.
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Analysis
by VulDB Data Team • 05/02/2022
The vulnerability identified as CVE-2015-0612 affects Cisco Unity Connection systems running specific versions of the Connection Conversation Manager process, which is responsible for managing SIP trunk integrations within the communication platform. This flaw exists in versions 8.5 before 8.5(1)SU6, 8.6 before 8.6(2a)SU4, and 9.x before 9.1(2)SU2, making it a significant concern for organizations relying on Cisco's unified communication solutions for their voice and collaboration infrastructure.
The technical flaw manifests when the CuCsMgr process receives a specially crafted UDP packet that triggers an improper handling mechanism within the SIP trunk integration functionality. This vulnerability specifically targets the process's ability to parse and process incoming SIP messages, causing the system to become unresponsive and ultimately leading to a complete SIP outage that affects all connected telephony services. The attack vector requires only remote access to send malicious UDP packets to the affected system, making it particularly dangerous as it can be exploited without authentication or physical access to the network.
The operational impact of this vulnerability extends beyond simple service disruption, as it can severely compromise an organization's communication infrastructure and business continuity. When the SIP outage occurs, all SIP trunk connections fail, resulting in inability to make or receive calls through the affected Cisco Unity Connection system. This affects not only voice communication but also any integrated services that depend on SIP trunk functionality, including video conferencing, instant messaging, and unified messaging services. The vulnerability can be exploited by attackers to perform sustained denial of service attacks that may require manual intervention to restore service, potentially causing significant operational disruption and financial loss for affected organizations.
Organizations should prioritize immediate remediation by applying the relevant software updates and security patches provided by Cisco, specifically targeting the versions mentioned in the vulnerability description. The mitigation strategy should include implementing network segmentation to limit access to the affected systems, deploying intrusion detection systems to monitor for suspicious UDP traffic patterns, and establishing network access controls to restrict unauthorized communication with the affected services. Additionally, organizations should consider implementing redundant communication paths and backup systems to maintain business continuity during the patching process. This vulnerability aligns with CWE-121 and CWE-122 categories related to buffer overflow conditions and memory management issues, while also mapping to ATT&CK technique T1499.004 for network disruption attacks and T1071.004 for application layer protocol usage in communication disruption scenarios.