CVE-2023-33933 – Apache Traffic Server versions 8.0.0 through 9.... (How to Fix)

Q: What is the severity of CVE-2023-33933?

CVE-2023-33933 has a CVSS score of 7.5 (HIGH). Apache Traffic Server versions 8.0.0 through 9.2.0 contain an information disclosure vulnerability that allows unauthorized actors to access sensitive information. This affects all users running vulnerable versions of the proxy server software. The vulnerability exposes internal data that should remain confidential.

📋 TL;DR

Apache Traffic Server versions 8.0.0 through 9.2.0 contain an information disclosure vulnerability that allows unauthorized actors to access sensitive information. This affects all users running vulnerable versions of the proxy server software. The vulnerability exposes internal data that should remain confidential.

💻 Affected Systems

Products:

Apache Traffic Server

Versions: 8.0.0 through 9.2.0

Operating Systems: All platforms running Apache Traffic Server

Default Config Vulnerable: ⚠️ Yes

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

📦 What is this software?

Traffic Server by Apache

View all CVEs affecting Traffic Server →

Traffic Server by Apache

View all CVEs affecting Traffic Server →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could access sensitive configuration data, internal network information, or credentials that could lead to further compromise of the infrastructure.

🟠

Likely Case

Unauthorized access to internal server information, configuration details, or metadata that could aid in reconnaissance for further attacks.

🟢

If Mitigated

Limited exposure of non-critical information with proper network segmentation and access controls in place.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

The CWE-200 classification suggests this is an information exposure vulnerability that likely requires minimal technical skill to exploit.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 8.1.7 or later for 8.x, 9.2.1 or later for 9.x

Vendor Advisory: https://lists.apache.org/thread/tns2b4khyyncgs5v5p9y35pobg9z2bvs

Restart Required: Yes

Instructions:

1. Download the patched version from Apache Traffic Server website. 2. Stop the Traffic Server service. 3. Install the updated version. 4. Restart the Traffic Server service. 5. Verify the new version is running.

🔧 Temporary Workarounds

Network Access Restriction

linux

Restrict network access to Traffic Server instances to only trusted sources

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 access controls to limit exposure to trusted sources only
Monitor logs for unusual access patterns or information disclosure attempts

🔍 How to Verify

Check if Vulnerable:

Check the Traffic Server version using 'traffic_server -V' or examine the running process version

Check Version:

traffic_server -V

Verify Fix Applied:

Verify the version is 8.1.7+ for 8.x or 9.2.1+ for 9.x using 'traffic_server -V'

📡 Detection & Monitoring

Log Indicators:

Unusual access patterns to sensitive endpoints
Requests that trigger information disclosure

Network Indicators:

Unusual traffic patterns to Traffic Server instances from unauthorized sources

SIEM Query:

source="traffic_server" AND (event_type="error" OR event_type="warning") AND message="*information*" OR message="*exposure*"

📊 Metadata

CVE ID: CVE-2023-33933

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: June 14, 2023

Last Updated: February 13, 2025

🔗 References

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