October 28, 2017 Karn Ganeshen

[ICS] SpiderControl SCADA Web Server Improper Privilege Management Vulnerability

Vendor: SpiderControl
Equipment: SCADA Web Server
Vulnerability: Improper Privilege Management

ICS-CERT Advisory
https://ics-cert.us-cert.gov/advisories/ICSA-17-250-01

CVE-ID
CVE-2017-12728

AFFECTED PRODUCTS

The following versions of SCADA Web Server, a software management platform, are affected:
SCADA Web Server Version 2.02.0007 and prior.

BACKGROUND

Critical Infrastructure Sector: Critical Manufacturing
Countries/Areas Deployed: Europe
Company Headquarters Location: Switzerland

IMPACT
Successful exploitation of this vulnerability could allow authenticated system users to escalate their privileges under certain conditions.

VULNERABILITY OVERVIEW

IMPROPER PRIVILEGE MANAGEMENT CWE-269

Authenticated, non-administrative local users are able to alter service executables with escalated privileges which could allow an attacker to execute arbitrary code under the context of the current system services.

CVE-2017-12728 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L).

Vulnerability Details

1. Untrusted Users Can Modify Windows Service Executables
It is possible for non-administrative local users to replace some of the Windows Service executables with malicious programs. This could be abused to execute programs with the privileges of the Windows services concerned.

The programs below have FILE_WRITE, WRITE_DAC or WRITE_OWNER permission granted to non-administrative users:

2. Delete Permission Granted On Windows Service Executables
It is possible for non-administrative local users to delete some of the Windows Service executables with malicious programs. This could lead to disruption or denial of service.

The programs below have DELETE permission granted to non-administrative users:

3. Append Permission Granted Windows Service Executables
It is possible for non-administrative local users to append to some of the Windows Service executables with malicious programs. This is unlikely to be exploitable for .exe files, but is it bad security practise to allow more access than necessary to low-privileged users.

The programs below have FILE_APPEND permission granted to non-administrative users:

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