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Sorax PDF Reader DLL Hijacking

Sorax PDF Reader DLL Hijacking
Posted Sep 13, 2010
Authored by Aung Khant | Site yehg.net

Sorax PDF Reader 2.0 suffers from an insecure DLL hijacking vulnerability.

tags | advisory
SHA-256 | 10e54b576b75282ef0d110601079921743d39ac0e676a85c2be8fbb153f3ade5

Sorax PDF Reader DLL Hijacking

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1. OVERVIEW

The Sorax PDF Reader application 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

Free and Easy-to-use PDF and eBook viewer. There is no need for
installation (for this reason, it can be started directly from any
kind of storage device - CD, PenDrive, etc.). Different language
versions may be created with the help of easily set local settings.


3. VULNERABILITY DESCRIPTION

The Sorax PDF Reader application passes an insufficiently qualified
path in loading its external library - "dwmapi.dll"
when a user opens its associated file with extensions - pdf .


4. VERSIONS AFFECTED

2.0 and probably lower versions


5. PROOF-OF-CONCEPT/EXPLOIT

http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/sorax_pdf_reader/poc/movie/sorax_pdf_reader-2.0.2274.32-dll_hijacking.mp4
http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/sorax_pdf_reader/poc/soax_pdf_reader-2.0.2274.32-dll_hijacking-poc.zip

Tested Platform: Windows XP Service Pack 3 (Fresh Windows)


6. IMPACT

Attackers can trigger a successful exploit against a victim user in a
number of ways such as placing a malicious external
library file made as hidden attribute and a seemingly interesting file
in network shares, usb drives, file sharing networks,
social networks, ..etc


7. SOLUTION

Fixed version from the vendor has not been released yet.
However, it is suggested that the following workarounds be deployed by
users to protect increasing mass exploitation of this
vulnerability class:
- Disable loading of libraries from WebDAV and remote network shares
- Disable the WebClient service
Please see workaround solution links in References section.


8. VENDOR

Sorax Software
http://www.soraxsoft.com/


9. CREDIT

This vulnerability was discovered by Aung Khant, http://yehg.net, YGN
Ethical Hacker Group, Myanmar.


10. DISCLOSURE TIME-LINE

09-11-2010: notified vendor
09-13-2010: vulnerability disclosed


11. REFERENCES

Original Advisory URL:
http://core.yehg.net/lab/pr0js/advisories/dll_hijacking/[sorax_pdf_reader]_2.0_insecure_dll_hijacking
Workaround Solution: http://support.microsoft.com/kb/2264107
Workaround Solution:
https://www.microsoft.com/technet/security/advisory/2269637.mspx#EGF
Developer Solution:
http://msdn.microsoft.com/en-us/library/ff919712%28v=VS.85%29.aspx
Unofficial DLL Hijacking List:
http://www.corelan.be:8800/index.php/2010/08/25/dll-hijacking-kb-2269637-the-unofficial-list/
Testing for DLL Hijacking:
http://core.yehg.net/lab/pr0js/view.php/when_testing_for_dll_hijacking.txt

#yehg [09-13-2010]

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