CVE-2025-9386
📋 TL;DR
CVE-2025-9386 is a use-after-free vulnerability in tcpreplay's tcprewrite component that allows local attackers to potentially execute arbitrary code or cause denial of service. The vulnerability affects tcpreplay versions up to 4.5.1 and requires local access to exploit. Organizations using tcpreplay for network testing or packet manipulation are affected.
💻 Affected Systems
- appneta tcpreplay
📦 What is this software?
Tcpreplay by Broadcom
⚠️ Risk & Real-World Impact
Worst Case
Local privilege escalation leading to full system compromise or persistent backdoor installation
Likely Case
Application crash (denial of service) or limited memory corruption
If Mitigated
Minimal impact if proper access controls limit local user privileges
🎯 Exploit Status
Exploit requires local access and knowledge of tcprewrite usage. Public exploit details available in disclosed references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.5.2-beta3 or later
Vendor Advisory: https://github.com/appneta/tcpreplay/issues/973
Restart Required: No
Instructions:
1. Download latest version from GitHub releases. 2. Compile and install following tcpreplay documentation. 3. Verify installation with version check.
🔧 Temporary Workarounds
Restrict tcprewrite access
allLimit execution of tcprewrite to trusted users only using file permissions
chmod 750 /usr/local/bin/tcprewrite
chown root:trustedgroup /usr/local/bin/tcprewrite
Disable vulnerable component
allRemove or disable tcprewrite if not essential for operations
rm /usr/local/bin/tcprewrite
mv /usr/local/bin/tcprewrite /usr/local/bin/tcprewrite.disabled
🧯 If You Can't Patch
- Implement strict access controls to limit who can execute tcprewrite
- Monitor system logs for unusual tcprewrite execution patterns
🔍 How to Verify
Check if Vulnerable:
Check tcpreplay version: tcpreplay --version | grep -i versionCheck Version:
tcpreplay --versionVerify Fix Applied:
Verify version is 4.5.2-beta3 or higher: tcpreplay --version📡 Detection & Monitoring
Log Indicators:
- Segmentation faults in tcprewrite
- Abnormal memory usage patterns in tcprewrite processes
Network Indicators:
- None - local exploitation only
SIEM Query:
process.name:"tcprewrite" AND (event.action:"segmentation_fault" OR event.action:"memory_violation")