CVE-2024-55627 – This vulnerability in Suricata allows an attack... (How to Fix)

Q: What is the severity of CVE-2024-55627?

CVE-2024-55627 has a CVSS score of 5.9 (MEDIUM). This vulnerability in Suricata allows an attacker to trigger a large buffer overflow via specially crafted TCP streams, potentially leading to denial of service or remote code execution. It affects all systems running Suricata versions prior to 7.0.8. The issue stems from an unsigned integer underflow during buffer initialization.

📋 TL;DR

This vulnerability in Suricata allows an attacker to trigger a large buffer overflow via specially crafted TCP streams, potentially leading to denial of service or remote code execution. It affects all systems running Suricata versions prior to 7.0.8. The issue stems from an unsigned integer underflow during buffer initialization.

💻 Affected Systems

Products:

Suricata

Versions: All versions prior to 7.0.8

Operating Systems: All operating systems running Suricata

Default Config Vulnerable: ⚠️ Yes

Notes: All Suricata deployments processing TCP traffic are vulnerable regardless of configuration.

📦 What is this software?

Suricata by Oisf

View all CVEs affecting Suricata →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise, allowing attacker to execute arbitrary code with Suricata's privileges.

🟠

Likely Case

Denial of service causing Suricata to crash, disrupting network security monitoring and potentially allowing undetected attacks.

🟢

If Mitigated

Limited impact if Suricata runs with minimal privileges and proper segmentation, though service disruption still occurs.

🌐 Internet-Facing: HIGH - Suricata typically processes network traffic from untrusted sources, making internet-facing instances directly vulnerable.

🏢 Internal Only: MEDIUM - Internal systems could be exploited by compromised internal hosts or lateral movement attempts.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires crafting malicious TCP streams but no authentication is needed. The vulnerability is in core TCP processing code.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 7.0.8

Vendor Advisory: https://github.com/OISF/suricata/security/advisories/GHSA-h2mv-7gg8-8x7v

Restart Required: Yes

Instructions:

1. Download Suricata 7.0.8 from official sources. 2. Stop Suricata service. 3. Install the new version. 4. Restart Suricata service. 5. Verify the version is 7.0.8 or higher.

🔧 Temporary Workarounds

TCP Stream Processing Disable

all

Disable TCP stream reassembly to prevent exploitation (severely impacts detection capabilities)

suricata -c suricata.yaml --set stream.tcp.enabled=no

Network Segmentation

linux

Restrict access to Suricata monitoring interfaces to trusted sources only

iptables -A INPUT -p tcp --dport <suricata_port> -s <trusted_ip> -j ACCEPT
iptables -A INPUT -p tcp --dport <suricata_port> -j DROP

🧯 If You Can't Patch

Implement strict network segmentation to limit traffic to Suricata from trusted sources only
Run Suricata with minimal privileges and in a containerized environment to limit potential impact

🔍 How to Verify

Check if Vulnerable:

Check Suricata version: suricata --build-info | grep 'Version'

Check Version:

suricata --build-info | grep 'Version'

Verify Fix Applied:

Verify version is 7.0.8 or higher: suricata --build-info | grep 'Version'

📡 Detection & Monitoring

Log Indicators:

Suricata crash logs
Unexpected termination of suricata process
High memory usage spikes in system logs

Network Indicators:

Malformed TCP streams with unusual patterns
Repeated connection attempts to Suricata monitoring ports

SIEM Query:

process_name:suricata AND (event_type:crash OR exit_code:139 OR exit_code:11)

📊 Metadata

CVE ID: CVE-2024-55627

CVSS v3 Score: 5.9 (MEDIUM)

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

CWE: CWE-122

EPSS Score: 0.16% exploit probability (37.1th percentile)

Published: January 6, 2025

Last Updated: March 31, 2025

🔗 References

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