Nginx Null Byte Code Execution

Description

Allowing null byte character (ASCII 0x00) in the URL can lead to a severe security risk. If the user can manipulate file contents on the server, this vulnerability may result in arbitrary PHP code execution, enabling attackers to take control of the server and execute unauthorized commands.

Recommendation

Upgrade Nginx to a version that properly sanitizes input and disallows null byte characters in URLs.

References

• CVE-2013-2028
• CVE-2013-2028: Nginx Null Byte Code Execution Vulnerability
• CWE-158
• Nginx
• OWASP 2021-A6