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SopCast 3.4.7 (Diagnose.exe) Improper Permissions

Medium
Advisory ID
ZSL-2011-5062
Release Date
05 December 2011
Vendor
Affected Version
3.4.7.45585
Tested On
Microsoft Windows XP Professional SP3 (EN)
Summary

SopCast is a simple, free way to broadcast video and audio or watch the video and listen to radio on the Internet. Adopting P2P(Peer-to-Peer) technology, It is very efficient and easy to use. SoP is the abbreviation for Streaming over P2P. Sopcast is a Streaming Direct Broadcasting System based on P2P. The core is the communication protocol produced by Sopcast Team, which is named sop://, or SoP technology.

Description

SopCast is vulnerable to an elevation of privileges vulnerability which can be used by a simple user that can change the executable file with a binary of choice. The vulnerability exist due to the improper permissions, with the 'F' flag (full control) for the 'Everyone' group, for the 'Diagnose.exe' binary file which is bundled with the SopCast installation package.

Proof of Concept
Disclosure Timeline
30.11.2011Vulnerability discovered.
01.12.2011Contact with the vendor with sent detailed info.
04.12.2011No response from the vendor.
05.12.2011Public security advisory released.
Credits
Vulnerability discovered by Gjoko Krstic
References
Changelog
05.12.2011Initial release
06.12.2011Added reference [3], [4] and [5]
08.12.2011Added reference [6]
15.12.2011Added reference [7]
15.01.2012Added reference [8]