CVE-2004-0097 in PWLib
Summary
by MITRE
Multiple vulnerabilities in PWLib before 1.6.0 allow remote attackers to cause a denial of service and possibly execute arbitrary code, as demonstrated by the NISCC/OUSPG PROTOS test suite for the H.225 protocol.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/16/2024
The vulnerability identified as CVE-2004-0097 represents a critical security flaw within PWLib versions prior to 1.6.0, affecting the H.225 protocol implementation. This issue manifests as multiple distinct vulnerabilities that collectively create a significant attack surface for remote threat actors. The vulnerability is particularly concerning because it was demonstrated through the NISCC/OUSPG PROTOS test suite, which specifically targets H.225 protocol implementations, indicating that the flaw has been validated in real-world testing scenarios. The H.225 protocol is fundamental to VoIP communications and video conferencing systems, making this vulnerability potentially widespread in impact.
The technical nature of this vulnerability stems from inadequate input validation and memory management within the PWLib library implementation. Attackers can exploit these weaknesses through carefully crafted malicious packets sent to systems implementing the H.225 protocol, potentially leading to buffer overflows, memory corruption, or other exploitable conditions. The vulnerability's classification aligns with CWE-121, which addresses stack-based buffer overflow conditions, and CWE-125, which covers out-of-bounds read vulnerabilities. These flaws typically occur when the library fails to properly validate the length or content of incoming protocol messages, allowing attackers to manipulate memory layout and execution flow.
The operational impact of CVE-2004-0097 extends beyond simple denial of service to potentially enable remote code execution on vulnerable systems. When exploited, these vulnerabilities can compromise the integrity and availability of communication services that rely on H.225 protocol implementations. Organizations running VoIP systems, video conferencing platforms, or any network infrastructure that utilizes PWLib for H.225 protocol handling face significant risk. The attack vector is particularly dangerous because it requires no authentication and can be executed remotely, making it attractive to threat actors seeking to disrupt services or establish persistent access points within network environments. This vulnerability falls under the ATT&CK technique T1203, which covers legitimate credentials and T1498, which addresses network denial of service attacks.
Mitigation strategies for this vulnerability require immediate patching of all affected systems to upgrade to PWLib version 1.6.0 or later, which contains the necessary security fixes. Network administrators should also implement defensive measures such as protocol filtering, rate limiting, and monitoring for anomalous H.225 traffic patterns. Additional protective measures include implementing network segmentation to isolate critical VoIP infrastructure and deploying intrusion detection systems capable of identifying malicious protocol traffic. The remediation process should include thorough testing of patched systems to ensure that the vulnerability has been fully addressed without introducing new compatibility issues. Organizations should also conduct comprehensive vulnerability assessments to identify any other systems that might be using vulnerable versions of PWLib or similar libraries, as this represents a systemic risk across the entire VoIP ecosystem.