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Backdoor.Win32.Vernet.axt MVID-2021-0413 Insecure Permissions

Backdoor.Win32.Vernet.axt MVID-2021-0413 Insecure Permissions
Posted Dec 3, 2021
Authored by malvuln | Site malvuln.com

Backdoor.Win32.Vernet.axt malware suffers from an insecure permissions vulnerability.

tags | exploit
systems | windows
SHA-256 | 999d275a7d62a955295dc2d227ba2e5020fc3c66b3f92c960a9457494396d749

Backdoor.Win32.Vernet.axt MVID-2021-0413 Insecure Permissions

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Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/f529d60abbdafccce3dc5e5ffd6cdfa6.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Vernet.axt
Vulnerability: Insecure Permissions
Description: The malware writes an .EXE with insecure permissions under c:\ drive granting change (C) permissions to the authenticated user group. Standard users can rename the executable dropped by the malware to disable it or replace it with their own executable. Then wait for a privileged user to logon to the infected machine to potentially escalate privileges.
Type: PE32
MD5: f529d60abbdafccce3dc5e5ffd6cdfa6
Vuln ID: MVID-2021-0413
Disclosure: 12/03/2021


Exploit/PoC:
C:\>cacls chikean.exe
C:\chikean.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C


C:\>dir chikean.exe
Volume in drive C has no label.

Directory of C:\

06/17/2012 01:43 AM 146,944 chikean.exe
1 File(s) 146,944 bytes


Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).
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