Man-in-the-middle attack in Siemens LOGO!8 BM

1) Man-in-the-middle attack

EUVDB-ID: #VU8048

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:T/RC:C]

CVE-ID: CVE-2017-12735

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform man-in-the-middle attack.

The weakness exists due to improper permissions and access controls.  A remote attacker with network access to the integrated web server on port 80/tcp can obtain the session ID of an active user session.

Mitigation

Siemens recommends applying the following mitigations for customers with existing
installations, and for mitigation of the second vulnerability:
- Configure the environment according to the recommendations in the user manual;
- Apply cell protection concept;
- Use VPN for protecting network communication between cells;
- Apply Defense-in-Depth.

Vulnerable software versions

LOGO!: All versions

CPE2.3

• cpe:2.3:h:siemens:logo!:*:*:*:*:*:*:*:*

External links

http://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-087240.pdf

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.