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.
Below is a copy: ShaprLynx v9.2.3 Insecure File Permissions
ShaprLynx v9.2.3 Insecure File Permissions
Vendor: Lynx Software Pty Ltd.
Product web page: https://www.sharplynx.com
Affected version: 9.02.0003
Summary: Back Office Software for Sharp POS Terminals. Catering for
the needs of retail and hospitality businesses, SharpLynx has been
developed as a modular software solution with options from simple
program management and sales analysis through to multi-location stock
control.
Desc: SharpLynx suffers from an elevation of privileges vulnerability
which can be used by a simple authenticated user that can change the
executable file with a binary of choice. The vulnerability exist due
to the improper permissions, with the 'C' flag (Change) for 'Authenticated
Users' group.
Tested on: Microsoft Windows 7 Professional SP1 (EN)
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience
Advisory ID: ZSL-2018-5456
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2018-5456.php
27.03.2018
--
C:\>cacls "Lynx Software"
C:\Lynx Software BUILTIN\Administrators:(ID)F
BUILTIN\Administrators:(OI)(CI)(IO)(ID)F
NT AUTHORITY\SYSTEM:(ID)F
NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(ID)F
BUILTIN\Users:(OI)(CI)(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(ID)C
C:\Lynx Software\SharpLynx v9>dir *.exe
Volume in drive C has no label.
Volume Serial Number is 54D3-A5E6
Directory of C:\Lynx Software\SharpLynx v9
02/22/2018 02:23 PM 527,840 SL.exe
02/22/2018 02:23 PM 6,747,104 SLE.exe
02/22/2018 02:23 PM 6,747,104 SLED.exe
02/22/2018 02:23 PM 6,747,104 SLER.exe
02/22/2018 02:23 PM 4,932,064 SLU.exe
02/22/2018 02:23 PM 4,932,064 SLUR.exe
07/15/2016 05:58 PM 7,590,288 TeamViewerQS_en.exe
7 File(s) 38,223,568 bytes
0 Dir(s) 2,677,899,264 bytes free
C:\Lynx Software\SharpLynx v9>cacls *.exe
C:\Lynx Software\SharpLynx v9\SL.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
C:\Lynx Software\SharpLynx v9\SLE.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
C:\Lynx Software\SharpLynx v9\SLED.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
C:\Lynx Software\SharpLynx v9\SLER.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
C:\Lynx Software\SharpLynx v9\SLU.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
C:\Lynx Software\SharpLynx v9\SLUR.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Users:(ID)C
C:\Lynx Software\SharpLynx v9\TeamViewerQS_en.exe BUILTIN\Administrators:(ID)F
NT AUTHORITY\SYSTEM:(ID)F
BUILTIN\Users:(ID)R
NT AUTHORITY\Authenticated Use
rs:(ID)C
C:\Lynx Software\SharpLynx v9>icacls SLE.exe
SLE.exe BUILTIN\Administrators:(I)(F)
NT AUTHORITY\SYSTEM:(I)(F)
BUILTIN\Users:(I)(RX)
NT AUTHORITY\Authenticated Users:(I)(M)
Successfully processed 1 files; Failed processing 0 files
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