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CosaNostra MVID-2022-0471 Builder Insecure Permissions

CosaNostra MVID-2022-0471 Builder Insecure Permissions
Posted Jan 25, 2022
Authored by malvuln | Site malvuln.com

CosaNostra Builder malware suffers from an insecure permissions vulnerability.

tags | exploit
SHA-256 | 6ac2d987dd89e8d52954e26a83c2885d18e6c66d1f4376b26089db79e278495b

CosaNostra MVID-2022-0471 Builder Insecure Permissions

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Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source: https://malvuln.com/advisory/61285c988de52b7c067fb2e703f2ab83.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: CosaNostra Builder
Vulnerability: Insecure Permissions
Description: The malware creates PE files with insecure permissions when writing to 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: 61285c988de52b7c067fb2e703f2ab83
Vuln ID: MVID-2022-0471
Disclosure: 01/24/2022

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

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

Directory of C:\

01/23/2022 11:37 PM 112,140 hate.exe
1 File(s) 112,140 bytes
0 Dir(s) 27,572,977,664 bytes free

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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