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Published on November 23rd, 2021 📆 | 4322 Views ⚑

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Backdoor.Win32.Curioso.zp Insecure Permissions – Torchsec

Discovery / credits: Malvuln – malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/1ae08493913b2a0c8cbcb0541da5a8bc.txt
Contact: [email protected]
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Curioso.zp
Vulnerability: Insecure Permissions
Description: The malware creates a dir 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: 1ae08493913b2a0c8cbcb0541da5a8bc
Vuln ID: MVID-2021-0402
Disclosure: 11/21/2021

Exploit/PoC:
C:>cacls test
C:test BUILTINAdministrators:(OI)(CI)(ID)F
NT AUTHORITYSYSTEM:(OI)(CI)(ID)F
BUILTINUsers:(OI)(CI)(ID)R
NT AUTHORITYAuthenticated Users:(ID)C
NT AUTHORITYAuthenticated Users:(OI)(CI)(IO)(ID)C

C:>dir /a test
Volume in drive C has no label.

Directory of C:test

02/17/2013 03:34 PM 733,184 svchost.exe
1 File(s) 733,184 bytes

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