CVE-2012-1008 in OfficeSIP Server
Summary
by MITRE
OfficeSIP Server 3.1 allows remote attackers to cause a denial of service (daemon crash) via a crafted To header in a SIP INVITE message.
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Analysis
by VulDB Data Team • 07/11/2025
The vulnerability identified as CVE-2012-1008 affects OfficeSIP Server version 3.1 and represents a significant denial of service weakness that can be exploited by remote attackers to crash the SIP daemon. This vulnerability specifically targets the processing of SIP INVITE messages, where an attacker can craft a malicious To header that triggers an unhandled exception in the server's SIP processing engine. The flaw demonstrates a classic buffer overflow or memory corruption issue that occurs when the system fails to properly validate or sanitize input parameters from incoming SIP messages, particularly focusing on the To header field which contains the target URI for the SIP session.
The technical implementation of this vulnerability exploits the server's insufficient input validation mechanisms within the Session Initiation Protocol processing stack. When a SIP INVITE message with a specially crafted To header is received, the OfficeSIP Server daemon attempts to parse and process this header without adequate bounds checking or parameter validation. This processing failure results in a crash of the SIP daemon service, effectively rendering the server unable to process legitimate SIP requests until manual intervention or system restart occurs. The vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and specifically relates to improper input validation in network protocol implementations. The attack vector requires only network access to the SIP server, making it particularly dangerous as it can be exploited from anywhere on the internet without requiring authentication or privileged access.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the reliability and availability of communication services that depend on the OfficeSIP Server. Organizations relying on this server for VoIP communications, unified messaging, or SIP-based collaboration services would experience immediate service degradation or complete outages when exploited. The vulnerability creates a persistent threat that can be repeatedly exploited to maintain service disruption, making it particularly attractive to attackers seeking to cause sustained operational damage. From an attacker's perspective, the low complexity and high impact nature of this vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and T1566.002, representing spearphishing with social engineering techniques that could be used to deliver the malicious SIP traffic. The vulnerability also represents a failure in the principle of least privilege and input sanitization, as the server should be designed to gracefully handle malformed input rather than crashing.
Mitigation strategies for this vulnerability should include immediate application of vendor patches or updates to OfficeSIP Server version 3.2 or later, which contain proper input validation for SIP headers. Network administrators should implement SIP-specific firewalls or intrusion prevention systems that can detect and filter malformed SIP messages before they reach the server. Additional protective measures include implementing rate limiting for SIP traffic, deploying monitoring solutions that can detect daemon crashes or restarts, and establishing redundant SIP server configurations to maintain service availability. Organizations should also consider implementing network segmentation to isolate SIP services from critical business networks and maintain comprehensive logging of SIP traffic for forensic analysis. The vulnerability highlights the importance of robust input validation in network protocol implementations and demonstrates the necessity of following security best practices such as those outlined in the OWASP Top Ten and NIST Cybersecurity Framework for protecting communication infrastructure against similar threats.