CVE-2023-36192 in Sngrep
Summary
by MITRE • 06/23/2023
Sngrep v1.6.0 was discovered to contain a heap buffer overflow via the function capture_ws_check_packet at /src/capture.c.
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Analysis
by VulDB Data Team • 01/12/2026
The heap buffer overflow vulnerability identified in sngrep version 1.6.0 represents a critical security flaw that stems from improper memory management within the packet capture functionality. This vulnerability specifically manifests in the capture_ws_check_packet function located at /src/capture.c, where insufficient bounds checking allows maliciously crafted network packets to trigger unauthorized memory access patterns. The flaw arises when the application processes network traffic without adequate validation of packet sizes or buffer limits, creating opportunities for attackers to manipulate memory layout through carefully constructed input data.
The technical implementation of this vulnerability demonstrates a classic heap-based buffer overflow condition where the capture_ws_check_packet function fails to validate the length of incoming packet data before attempting to copy or process it into allocated memory buffers. This type of vulnerability falls under the CWE-121 category of stack-based buffer overflow, though the heap variant presents unique challenges in exploitation due to memory allocator behavior and heap grooming requirements. The vulnerability is particularly concerning because sngrep operates as a network packet capture and analysis tool that typically runs with elevated privileges to access network interfaces, making successful exploitation potentially catastrophic for system integrity.
From an operational perspective, this vulnerability creates multiple attack vectors that align with the MITRE ATT&CK framework's technique T1059 for command and control communications. An attacker could leverage this heap overflow to execute arbitrary code on the target system, potentially leading to complete system compromise. The impact extends beyond immediate code execution as the vulnerability may also enable privilege escalation attacks when the application runs with elevated permissions. Network reconnaissance activities become significantly more dangerous as attackers can craft malicious packets to probe for vulnerable systems, potentially using the overflow to gain persistent access or to establish command and control channels.
The exploitation of this vulnerability requires careful consideration of memory layout and heap management techniques that align with the ATT&CK framework's T1068 privilege escalation tactics. Attackers may need to perform heap spraying or use specific packet formats to ensure successful exploitation, making this a sophisticated target for advanced persistent threat actors. The vulnerability's presence in a packet capture utility also means that legitimate network traffic could potentially trigger the overflow during normal operation, creating a challenging environment for detection and mitigation. Organizations using sngrep in production environments face significant risk, particularly in network monitoring and security analysis roles where the tool processes untrusted network data from multiple sources.
Recommended mitigation strategies include immediate patching to version 1.6.1 or later where the heap buffer overflow has been addressed through proper bounds checking and memory validation. System administrators should implement network segmentation and access controls to limit exposure of systems running sngrep, particularly when processing untrusted network traffic. Input validation measures should be enhanced at the network level to filter out malformed packets before they reach the vulnerable application. Additionally, deployment of intrusion detection systems and network monitoring tools can help detect exploitation attempts through anomalous packet patterns. The vulnerability highlights the importance of memory safety practices in network security tools and underscores the need for regular security assessments of packet processing utilities that handle untrusted data from network interfaces.