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CVE-2025-51006: Double Free Vulnerability in Tcpreplay’s Tcprewrite

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Overview

The vulnerability identified as CVE-2025-51006 is a critical flaw found within tcpreplay’s tcprewrite. This flaw could potentially lead to system compromise or data leakage, affecting any system relying on the tcpreplay software for packet replay. The presence of this vulnerability in an environment could lead to a successful DoS attack, causing significant operational disruptions.

Vulnerability Summary

CVE ID: CVE-2025-51006
Severity: High (CVSS score: 7.8)
Attack Vector: Local
Privileges Required: Low
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Tcpreplay’s Tcprewrite | All versions prior to patch

How the Exploit Works

The exploit takes advantage of a double free vulnerability in the dlt_linuxsll2_cleanup() function within the tcpreplay’s tcprewrite. The vulnerability is triggered when tcpedit_dlt_cleanup() indirectly invokes the cleanup routine multiple times on the same memory region. By supplying a specifically crafted pcap file to the tcprewrite binary, an attacker can cause memory corruption, leading to a Denial of Service (DoS).

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited. This example uses a shell command to feed a malicious pcap file to the tcprewrite binary:

./tcprewrite --infile=malicious.pcap --outfile=clean.pcap --dlt=EN10MB --enet-dmac=00:11:22:33:44:55 --enet-smac=66:77:88:99:aa:bb

In this example, “malicious.pcap” is a pcap file crafted to exploit the double free vulnerability in the tcprewrite.

Mitigation

Affected users should apply vendor patches as soon as they become available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be used as temporary mitigation against potential attacks exploiting this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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