Privilege escalation in AVEVA Vijeo Citect and Citect SCADA

1) Insecure DLL loading

EUVDB-ID: #VU15702

Risk: Low

CVSSv3.1: 7.1 [CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-7799

CWE-ID: CWE-427 - Uncontrolled Search Path Element

Exploit availability: No

Description

The vulnerability allows a local attacker to gain elevated privileges.

The vulnerability exists due to insecure .dll loading mechanism when opening files. A local attacker can place a file along with specially crafted .dll file on a remote SBM or WebDAV share, trick the victim into opening it and execute arbitrary code on the target system with privileges of the current victim.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Update the affected products to version 2.2.0.

Vulnerable software versions

Citect SCADA 2016: before 2.2.0

Citect SCADA 2015: before 2.2.0

Citect SCADA: before 2.2.0

Vijeo Citect 2015: before 2.2.0

Vijeo Citect: before 2.2.0

External links

http://sw.aveva.com/hubfs/assets-2018/pdf/security-bulletin/SecurityAdvisory_LFSec134.pdf

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.