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:bbIn 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.
