Monday, 17 February 2020

Sharepoint RCE

Summary:
Few days ago I saw a post from alienvault which says attackers are still exploiting SharePoint vulnerability to attack middle east government organization. Having said that I found Income Tax Department India and MIT Sloan was also vulnerable to CVE-2019-0604 a remote code execution vulnerability which exists in Microsoft SharePoint. A malicious actor could exploit this vulnerability by simply sending a specially crafted SharePoint application package.

Technical analysis:
I found this vulnerability during my free time while I was browsing to ZoomEye to find such component. The application (incometaxindia.gov.in) was found to be vulnerable as it was using SharePoint as a technology to host its service. To verify this I've sent a crafted payload which enable the remote server (incometaxindia.gov.in) to perform a DNS lookup on my burp collaborator. You can do this manual by sending the crafted XML payload or via desharialize.


Aside, MIT Sloan School of Management was also found to be vulnerable with CVE-2019-0604.


Responsible Disclosure:
CERT-In (IncomeTaxIndia):
This was sent to CERT-In on Feb 12, 2020, got initial response by them on Feb 13, 2020. Post that the vulnerability was patch silently.
For MIT:
This was sent to MIT security team on Feb 13, 2020, got initial response by them on Feb 14, 2020. Post that the vulnerability was patch silently on Feb 15, 2020.
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