Hi all, I would like to disclose a vulnerability that I just found today. Details below: Vulnerable Software and Version: 1. Rufus 3.17.1846 executable 2. Rufus 3.17.1846 portable executable Vulnerable software download link: https://rufus.ie/en/ https://github.com/pbatard/rufus/releases/tag/v3.17 Date discovered and reported: 25 Feb 2022 Description: Both Rufus 3.17.1846 executable AND portable executable are suffering from DLL Hijacking by placing x86 MSASN1.dll or VERSION.dll in the same directory as the executables, which could cause arbitrary code execution and privilege escalation. Taking MSASN1.dll as an example, craft a malicious x86 DLL with an entry point with DllMain and place in the same directory, once double click the executable, an x86 admin shell could be obtained as the executable requires admin right to run by design. Attack vector: Taking MSASN1.dll as an example PoC code of dll can be found in my repository Attack steps: 1. Craft and drop a malicious DLL named as "MSASN1.dll" with entry point DllMain [image: image] <https://user-images.githubusercontent.com/21979646/155570972-1ca622d7-f75e-42ba-b9e5-45eace8fd8d3.png> 2. Double click the executable "Rufus", administrator privilege is required to run 3. Malicious DLL has been called and an admin shell can be obtained as PoC [image: image] <https://user-images.githubusercontent.com/21979646/155571105-aabc503a-47e9-4489-b6f8-df1aad548b70.png> This issue has been submitted to github as well and is acknowledged by the owner, https://github.com/pbatard/rufus/issues/1877 Thanks and regards, James Tsz Ko Yeung