Remote code execution in Schneider Electric InduSoft Web Studio and InTouch Machine Edition

1) Stack-based buffer overflow

EUVDB-ID: #VU11894

Risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-8840

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to stack-based buffer overflow. A remote unauthenticated attacker can send a carefully crafted packet during a tag, alarm, or event related action such as read and write, trigger memory corruption and execute arbitrary code with elevated privileges.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update to version 8.1 SP1.

Vulnerable software versions

InTouch Edge HMI: 8.0 - 8.1

AVEVA Edge: 8.0 - 8.1

External links

http://software.schneider-electric.com/pdf/security-bulletin/lfsec00000125/%20

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.

Is there known malware, which exploits this vulnerability?

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