CVE-2022-27940 – CVE-2022-27940 is a heap-based buffer over-read... (How to Fix)

📋 TL;DR

CVE-2022-27940 is a heap-based buffer over-read vulnerability in tcprewrite component of Tcpreplay 4.4.1. This allows attackers to read sensitive memory contents, potentially leading to information disclosure or crash of the application. Users running Tcpreplay 4.4.1 with tcprewrite are affected.

💻 Affected Systems

Products:

Tcpreplay

Versions: 4.4.1 specifically

Operating Systems: Linux, Unix-like systems

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects tcprewrite component when processing IPv6 packets

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution through memory corruption leading to complete system compromise

🟠

Likely Case

Application crash (denial of service) or information disclosure from memory contents

🟢

If Mitigated

Limited impact if tcprewrite is not processing untrusted input files

🌐 Internet-Facing: LOW - tcprewrite typically processes local packet capture files

🏢 Internal Only: MEDIUM - Could be exploited by malicious internal users feeding crafted pcap files

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Requires feeding malicious pcap files to tcprewrite

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 4.4.2 and later

Vendor Advisory: https://github.com/appneta/tcpreplay/issues/718

Restart Required: No

Instructions:

1. Upgrade Tcpreplay to version 4.4.2 or later
2. Recompile if using source distribution
3. Verify installation with tcpreplay --version

🔧 Temporary Workarounds

Avoid processing untrusted pcap files

all

Only use tcprewrite with trusted packet capture files

Disable IPv6 processing

linux

Filter out IPv6 packets before processing with tcprewrite

tcpdump -r input.pcap 'not ip6' -w filtered.pcap

🧯 If You Can't Patch

Restrict tcprewrite usage to trusted users only
Implement file integrity monitoring on pcap files processed by tcprewrite

🔍 How to Verify

Check if Vulnerable:

Run: tcprewrite --version | grep -q '4.4.1' && echo 'VULNERABLE'

Check Version:

tcprewrite --version

Verify Fix Applied:

Run: tcprewrite --version | grep -q '4.4.2\|4.4.3\|4.5' && echo 'PATCHED'

📡 Detection & Monitoring

Log Indicators:

Segmentation fault or crash logs from tcprewrite
Unexpected memory access errors

Network Indicators:

Unusual pcap file transfers to systems running tcprewrite

SIEM Query:

process_name:tcprewrite AND (event_type:crash OR exit_code:139)

📊 Metadata

CVE ID: CVE-2022-27940

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE: CWE-125

Published: March 26, 2022

Last Updated: November 21, 2024

🔗 References

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🔗 Related Vulnerabilities

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📋 TL;DR

💻 Affected Systems

📦 What is this software?

Fedora by Fedoraproject

Fedora by Fedoraproject

Fedora by Fedoraproject

Tcpreplay by Broadcom

⚠️ Risk & Real-World Impact

Worst Case

Likely Case

If Mitigated

🎯 Exploit Status

🛠️ Fix & Mitigation

✅ Official Fix

Instructions:

🔧 Temporary Workarounds

Avoid processing untrusted pcap files

Disable IPv6 processing

🧯 If You Can't Patch

🔍 How to Verify

Check if Vulnerable:

Check Version:

Verify Fix Applied:

📡 Detection & Monitoring

Log Indicators:

Network Indicators:

SIEM Query:

📊 Metadata

🔗 References

📤 Share & Export

🔗 Related Vulnerabilities