CVE-2025-6175: Geodi CRLF Injection Vulnerability

CVE-2025-6175 Overview

CVE-2025-6175 is a CRLF Injection vulnerability affecting DECE Software Geodi that allows attackers to perform HTTP Request Splitting attacks. The vulnerability stems from improper neutralization of CRLF (Carriage Return Line Feed) sequences in user-controlled input, enabling malicious actors to manipulate HTTP headers and potentially compromise application integrity.

This flaw allows remote attackers to inject arbitrary HTTP headers into responses, which can lead to cache poisoning, cross-site scripting (XSS), session hijacking, and other web-based attacks. The network-accessible nature of this vulnerability significantly expands the potential attack surface.

Critical Impact

Remote attackers can exploit this CRLF Injection flaw to split HTTP requests and responses, potentially enabling cache poisoning, session fixation, and cross-site scripting attacks without authentication.

Affected Products

• DECE Software Geodi versions prior to GEODI Setup 9.0.146

Discovery Timeline

• 2025-07-29 - CVE-2025-6175 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-6175

Vulnerability Analysis

This vulnerability is classified as CWE-93 (Improper Neutralization of CRLF Sequences in HTTP Headers). CRLF Injection occurs when an application fails to properly sanitize user input containing carriage return (\r or %0d) and line feed (\n or %0a) characters before incorporating them into HTTP responses.

In the context of DECE Software Geodi, attackers can inject these control characters into input fields or URL parameters that are reflected in HTTP response headers. When the web server processes these malformed requests, it interprets the injected CRLF sequences as legitimate header terminators, allowing attackers to insert arbitrary headers or even split the HTTP response entirely.

The network-based attack vector with no authentication requirements makes this vulnerability particularly concerning, as any remote attacker can attempt exploitation without needing valid credentials or user interaction.

Root Cause

The root cause of CVE-2025-6175 lies in insufficient input validation within the DECE Software Geodi application. The software fails to properly sanitize or reject user-supplied data containing CRLF character sequences before including them in HTTP response headers. This lack of neutralization allows special characters to be interpreted as header delimiters by the HTTP protocol, breaking the intended response structure.

Attack Vector

The attack vector is network-based, requiring no privileges or user interaction. An attacker can craft malicious HTTP requests containing CRLF sequences in parameters, headers, or URL paths that are reflected in the server's response. By injecting %0d%0a (URL-encoded CRLF) followed by arbitrary header content, attackers can:

1. Inject malicious headers - Add arbitrary HTTP headers like Set-Cookie for session fixation
2. Split HTTP responses - Create a second, attacker-controlled response body for XSS attacks
3. Poison web caches - Insert malicious content that gets cached and served to other users

The vulnerability manifests when user-controlled input is reflected in HTTP response headers without proper sanitization. For technical details on CRLF injection attack patterns, refer to the USOM Security Notification TR-25-0182.

Detection Methods for CVE-2025-6175

Indicators of Compromise

• Presence of URL-encoded CRLF sequences (%0d%0a, %0D%0A) in HTTP request logs
• Unusual Set-Cookie headers or unexpected HTTP headers appearing in responses
• Web cache entries containing suspicious or malformed content
• Evidence of HTTP response splitting in proxy or WAF logs

Detection Strategies

• Configure Web Application Firewalls (WAF) to detect and block requests containing CRLF sequences in headers and parameters
• Implement log analysis rules to identify patterns indicative of HTTP header injection attempts
• Deploy intrusion detection signatures targeting URL-encoded control characters in HTTP traffic
• Enable verbose logging on web servers to capture full request headers for forensic analysis

Monitoring Recommendations

• Monitor web server access logs for requests containing %0d, %0a, \r\n, or similar encoded sequences
• Set up alerts for anomalous HTTP response sizes or unexpected header counts
• Review cache server logs for evidence of cache poisoning attempts
• Implement real-time monitoring of HTTP response header integrity

How to Mitigate CVE-2025-6175

Immediate Actions Required

• Upgrade DECE Software Geodi to version GEODI Setup 9.0.146 or later immediately
• Implement input validation to reject or sanitize CRLF characters from all user-supplied data
• Deploy WAF rules to block HTTP requests containing CRLF injection patterns
• Audit existing application logs for evidence of exploitation attempts

Patch Information

DECE Software has addressed this vulnerability in GEODI Setup version 9.0.146 and later releases. Organizations running affected versions should prioritize upgrading to the patched version. For additional details, refer to the USOM Security Notification TR-25-0182.

Workarounds

• Deploy a Web Application Firewall (WAF) configured to block CRLF injection patterns
• Implement server-side input validation to strip or encode CR and LF characters from all user input
• Use HTTP response header encoding libraries that automatically neutralize control characters
• Consider placing vulnerable instances behind a reverse proxy with strict header validation

# Example WAF rule pattern for ModSecurity to block CRLF injection
# Add to modsecurity.conf or rules file
SecRule REQUEST_URI|ARGS|REQUEST_HEADERS "@rx (%0[aAdD]|\\r|\\n)" \
    "id:100001,phase:1,deny,status:403,msg:'CRLF Injection Attempt Blocked'"