CVE-2023-41752 – Apache Traffic Server versions 8.0.0-8.1.8 and ... (How to Fix)

Q: What is the severity of CVE-2023-41752?

CVE-2023-41752 has a CVSS score of 7.5 (HIGH). Apache Traffic Server versions 8.0.0-8.1.8 and 9.0.0-9.2.2 expose sensitive information to unauthorized actors. This CWE-200 vulnerability allows attackers to access confidential data they shouldn't have permission to view. Organizations using affected versions of this reverse proxy and caching server are at risk.

📋 TL;DR

Apache Traffic Server versions 8.0.0-8.1.8 and 9.0.0-9.2.2 expose sensitive information to unauthorized actors. This CWE-200 vulnerability allows attackers to access confidential data they shouldn't have permission to view. Organizations using affected versions of this reverse proxy and caching server are at risk.

💻 Affected Systems

Products:

Apache Traffic Server

Versions: 8.0.0 through 8.1.8, 9.0.0 through 9.2.2

Operating Systems: All operating systems running affected versions

Default Config Vulnerable: ⚠️ Yes

Notes: All configurations of affected versions are vulnerable; no special configuration required for exploitation.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could access sensitive configuration data, authentication credentials, or internal network information, potentially leading to full system compromise or data breach.

🟠

Likely Case

Unauthorized access to configuration files, logs, or other sensitive information that could facilitate further attacks.

🟢

If Mitigated

Limited exposure of non-critical information if proper network segmentation and access controls are implemented.

🌐 Internet-Facing: HIGH - Apache Traffic Server is typically deployed as an internet-facing reverse proxy, making it directly accessible to attackers.

🏢 Internal Only: MEDIUM - Even internally deployed instances could be exploited by internal threats or compromised internal systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

The vulnerability allows information exposure without authentication, suggesting relatively simple exploitation.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 8.1.9 or 9.2.3

Vendor Advisory: https://lists.apache.org/thread/5py8h42mxfsn8l1wy6o41xwhsjlsd87q

Restart Required: Yes

Instructions:

1. Download Apache Traffic Server 8.1.9 or 9.2.3 from official Apache mirrors. 2. Stop the Traffic Server service. 3. Backup configuration files. 4. Install the new version following platform-specific installation procedures. 5. Restore configurations. 6. Start the service and verify functionality.

🔧 Temporary Workarounds

Network Access Restriction

linux

Restrict network access to Traffic Server instances using firewall rules to limit exposure.

iptables -A INPUT -p tcp --dport 8080 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 8080 -j DROP

🧯 If You Can't Patch

Implement strict network segmentation to isolate Traffic Server instances from sensitive systems
Deploy web application firewall (WAF) rules to detect and block information disclosure attempts

🔍 How to Verify

Check if Vulnerable:

Check Traffic Server version: traffic_server -v | grep -E '8\.(0\.0|1\.[0-8])|9\.(0\.[0-9]|1\.[0-9]|2\.[0-2])'

Check Version:

traffic_server -v

Verify Fix Applied:

Verify version is 8.1.9 or higher for 8.x branch, or 9.2.3 or higher for 9.x branch: traffic_server -v

📡 Detection & Monitoring

Log Indicators:

Unusual access patterns to configuration endpoints
Requests for sensitive paths that normally shouldn't be accessible

Network Indicators:

Unusual traffic patterns to Traffic Server management interfaces
External IPs accessing sensitive endpoints

SIEM Query:

source="traffic_server" AND (uri_path="/config/*" OR uri_path="/admin/*") AND src_ip NOT IN internal_networks

📊 Metadata

CVE ID: CVE-2023-41752

CVSS v3 Score: 7.5 (HIGH)

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

CWE: CWE-200

Published: October 17, 2023

Last Updated: June 12, 2025

🔗 References

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