CVE-2018-18408 in tcpreplay
Summary
by MITRE
A use-after-free was discovered in the tcpbridge binary of Tcpreplay 4.3.0 beta1. The issue gets triggered in the function post_args() at tcpbridge.c, causing a denial of service or possibly unspecified other impact.
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Analysis
by VulDB Data Team • 05/30/2023
The vulnerability CVE-2018-18408 represents a critical use-after-free condition in the tcpbridge component of Tcpreplay version 4.3.0 beta1, classified under CWE-416 as improper free or use of freed memory. This flaw occurs within the post_args() function in the tcpbridge.c source file, where memory that has been freed is subsequently accessed or referenced, creating a potential vector for exploitation that can lead to system instability and denial of service conditions.
The technical implementation of this vulnerability stems from improper memory management practices during the argument processing phase of the tcpbridge utility. When the post_args() function executes, it handles command-line arguments and internal state management that leads to a scenario where allocated memory structures are freed but not properly nullified, allowing subsequent code paths to reference these freed memory locations. This memory corruption pattern typically arises from inadequate defensive programming practices and insufficient validation of memory allocation states during program execution cycles.
From an operational impact perspective, this vulnerability creates significant risks for network security professionals and system administrators who rely on Tcpreplay for network traffic replay and analysis tasks. The use-after-free condition can manifest as immediate program termination, leading to denial of service for legitimate users attempting to utilize the tcpbridge functionality. In more sophisticated exploitation scenarios, attackers could potentially leverage this memory corruption to execute arbitrary code or escalate privileges, though the current reporting indicates the primary impact remains denial of service with possible unspecified consequences.
The vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1499.004 for network denial of service, as it enables adversaries to disrupt network operations through compromised network analysis tools. Security practitioners should consider this vulnerability as part of broader network infrastructure hardening efforts, particularly in environments where network traffic analysis and replay capabilities are essential for security monitoring and incident response operations.
Mitigation strategies for CVE-2018-18408 should prioritize immediate patching of affected Tcpreplay installations to version 4.3.0 or later, where the memory management issues have been addressed through proper free and nullification practices. Organizations should also implement monitoring for abnormal process termination patterns in tcpbridge usage and consider runtime protections such as address space layout randomization and stack canaries. Additionally, network security teams should validate that their network traffic analysis workflows do not rely on potentially compromised versions of Tcpreplay tools, and maintain updated inventories of all network analysis software components to prevent similar vulnerabilities from persisting in operational environments.