Overview
This report discusses the CVE-2025-31497 vulnerability, a critical flaw found in the TEIGarage webservice, specifically in its Document Conversion Service. This vulnerability is an XML External Entity (XXE) Injection vulnerability that could potentially allow unauthorized access to sensitive files from the server’s filesystem. The security flaw affects all users of the service and poses a significant risk due to the potential exposure of confidential information.
Vulnerability Summary
CVE ID: CVE-2025-31497
Severity: Critical (CVSS 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
TEIGarage Document Conversion Service | All versions before 1.2.4
How the Exploit Works
The vulnerability stems from the TEIGarage’s Document Conversion Service’s failure to disable external entity processing while converting XML files. This oversight could allow an attacker to perform an XXE Injection attack by manipulating XML data processed by the service to include references to external entities. These entities could point to local resources on the server, enabling an attacker to read arbitrary files, potentially exposing sensitive information. In certain server configurations, the vulnerability could also be exploited to perform server-side request forgery (SSRF) attacks.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited using a specially crafted XML payload:
POST /convert HTTP/1.1
Host: vulnerable-teigarage.example.com
Content-Type: application/xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY >
<!ENTITY xxe SYSTEM "file:///etc/passwd" >]>
<foo>&xxe;</foo>In this example, the attacker attempts to read the `/etc/passwd` file from the target server’s filesystem.
Mitigation
To mitigate this vulnerability, users are advised to update the TEIGarage Document Conversion Service to the patched version, 1.2.4. If unable to update immediately, consider disabling external entity processing in the XML parser by setting the appropriate security features, such as XMLConstants.FEATURE_SECURE_PROCESSING. As a temporary measure, use Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) to detect and block potential XXE Injection attacks.