CVE-2022-25484 in tcpprep
Summary
by MITRE • 03/22/2022
tcpprep v4.4.1 has a reachable assertion (assert(l2len > 0)) in packet2tree() at tree.c in tcpprep v4.4.1.
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Analysis
by VulDB Data Team • 03/25/2022
The vulnerability identified as CVE-2022-25484 affects tcpprep version 4.4.1, a network packet processing tool commonly used for preparing packet captures for testing network applications. This issue manifests as a reachable assertion failure within the packet2tree() function located in the tree.c source file, specifically triggering when the condition assert(l2len > 0) evaluates to false. The assertion mechanism serves as a debugging aid to catch programming errors during development, but its reachability in a production environment represents a significant security concern that can be exploited by malicious actors.
The technical flaw stems from inadequate input validation within the packet processing pipeline where the tool fails to properly handle packets with zero-length Layer 2 headers. The l2len variable represents the length of the Layer 2 (data link layer) portion of network packets, and when this value becomes zero or negative, the assertion fails, causing the application to terminate abruptly. This behavior creates a denial of service condition that can be reliably triggered by crafting specific packet captures containing malformed Layer 2 headers. The vulnerability is classified as a weakness in input validation and can be categorized under CWE-665 as improper initialization of resources, specifically related to network packet parsing.
The operational impact of this vulnerability extends beyond simple service disruption as it can be leveraged by attackers to perform denial of service attacks against systems running tcpprep. When an attacker can trigger this assertion failure, they effectively gain the ability to crash the application at will, potentially disrupting network analysis workflows, testing environments, or automated security tooling that relies on tcpprep for packet preparation. This vulnerability is particularly concerning in environments where tcpprep is used as part of automated security testing pipelines, continuous integration systems, or network monitoring infrastructure. The attack surface is broad since any network traffic processing system that utilizes this tool could be affected, including security operations centers, penetration testing environments, and network forensics platforms.
Mitigation strategies for CVE-2022-25484 should prioritize immediate patching of affected tcpprep installations to version 4.4.2 or later where the assertion handling has been corrected. Organizations should also implement network segmentation and access controls to limit exposure of systems running tcpprep to untrusted network traffic. Input validation should be enhanced at multiple layers to prevent malformed packets from reaching the vulnerable code path, implementing proper error handling and graceful degradation rather than abrupt termination. Additionally, monitoring systems should be configured to detect abnormal application termination patterns that could indicate exploitation attempts. The vulnerability aligns with ATT&CK technique T1499.004 for network denial of service and demonstrates the importance of robust input validation in network security tools as specified in NIST SP 800-160 and ISO/IEC 27001 security standards.