Overview
This report presents an analysis of the CVE-2025-31698 vulnerability, a flaw that exists in the Apache Traffic Server’s Access Control List (ACL) settings. This vulnerability could potentially lead to system compromise or data leakage. Organizations utilizing the Apache Traffic Server versions 10.0.0 to 10.0.6 and 9.0.0 to 9.2.10 are at risk and thus, must take prompt action to secure their systems.
Vulnerability Summary
CVE ID: CVE-2025-31698
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage
Affected Products
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Product | Affected Versions
Apache Traffic Server | 10.0.0 through 10.0.6
Apache Traffic Server | 9.0.0 through 9.2.10
How the Exploit Works
The vulnerability lies within the ACL configuration in the ip_allow.config or remap.config files in the Apache Traffic Server. The server is not correctly utilizing the IP addresses provided by the PROXY protocol. This can allow an attacker to bypass the ACL and potentially gain unauthorized access to the system, leading to possible system compromise or data leakage.
Conceptual Example Code
This is a conceptual example of how the vulnerability might be exploited using HTTP requests:
GET / HTTP/1.1
Host: target.example.com
X-Forwarded-For: malicious_ip_addressNote: In this example, the attacker is using the X-Forwarded-For HTTP header to spoof an IP address (malicious_ip_address) that is not correctly processed by the ACL, thus potentially gaining unauthorized access to the system.
