Thursday 19 April 2018

Foxit Reader 8.3.1.21155 ( Unsafe DLL Loading Vulnerability )

1. OVERVIEW

The Foxit Reader is vulnerable to Insecure DLL Hijacking
Vulnerability. Similar terms that describe this vulnerability
have been come up with Remote Binary Planting, and Insecure DLL
Loading/Injection/Hijacking/Preloading.

2. PRODUCT DESCRIPTION

Foxit Reader is a multilingual freemium PDF tool that can create, view, edit, digitally sign, and print PDF files. Foxit Reader is developed by Fremont, California-based Foxit Software Incorporated. Early versions of Foxit Reader were notable for startup performance and small file size.

3. VULNERABILITY DESCRIPTION

The Foxit Reader application passes an insufficiently qualified path in
loading an external library when a user launch the application

Affected Library List
---------------------

[*] RICHED20.DLL
[*] CRYPTSP.dll
[*] USERENV.dll
[*] profapi.dll
[*] RpcRtRemote.dll
[*] apphelp.dll
[*] ntmarta.dll
[*] DEVRTL.dll
[*] credssp.dll
[*] DNSAPI.dll
[*] rasadhlp.dll
[*] schannel.DLL
[*] RASAPI32.dll
[*] rtutils.dll
[*] sensapi.dll
[*] dhcpcsvc.DLL
[*] secur32.dll
[*] ncrypt.dll
[*] bcrypt.dll
[*] GPAPI.dll
[*] cryptnet.dll
[*] dhcpcsvc6.DLL
[*] Cabinet.dll
[*] WindowsCodecs.dll

4. VERSIONS AFFECTED

8.3.1.21155 and prior

5. PROOF-OF-CONCEPT/EXPLOIT


TBA


Tested Platform: Windows 7 x64 (Fresh Windows)

6. IMPACT

This occurs when an application fails to resolve a DLL because the DLL does not exist in the specified path or search directories. If this happens, a malicious Dll with the same name can be placed in the specified path directory leading to remote code execution.


7. SOLUTION

Update the latest version of Foxit PDF reader
https://www.foxitsoftware.com/support/security-bulletins.php

For both groups:
    Microsoft has a great article explaining the DLL-related registry keys and how they can be used to protect applications -
 http://blogs.technet.com/b/srd/archive/2010/08/23/more-information-about-dll-preloading-remote-attack-vector.aspx


8. VENDOR

Foxit
https://www.foxitsoftware.com/pdf-reader/

9. CREDIT

This vulnerability was discovered by Ye Yint Min Thu htut, http://pentest.space

10. DISCLOSURE TIME-LINE

07-30-2017: vulnerability discovered
07-30-2017: notified vendor
04-18-2018: vendor fixed and patch released (https://www.foxitsoftware.com/support/security-bulletins.php)
04-20-2018: vulnerability disclosed

11. REFERENCES
https://support.microsoft.com/en-us/help/2389418/secure-loading-of-libraries-to-prevent-dll-preloading-attacks
https://cwe.mitre.org/data/definitions/427.html