DedeCMS PHP Code Injection Vulnerability Allows Remote Code Execution

DedeCMS through 5.8.1-beta contains a PHP code injection vulnerability in ShowMsg(), where the HTTP Referer header is written into a DedeTemplate string and included.

Unauthenticated attackers can send a crafted Referer to /plus/flink.php?dopost=save with an empty validate code to execute arbitrary PHP and system commands.

• Affected versions: DedeCMS through 5.8.1-beta
• Attack vector: unauthenticated HTTP request with crafted Referer
• Impact: arbitrary PHP and system command execution
• Exploitation observed by the Shadowserver Foundation on 2023-10-14