#VU10353 Privilege escalation in TeleControl Server Basic - CVE-2018-4836

Vulnerability identifier: #VU10353

Vulnerability risk: Low

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-4836

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TeleControl Server Basic
Client/Desktop applications / Other client software

Vendor: Siemens

Description
The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The weakness exists due to improper access and privileges controls. A remote attacker with network access to Port 8000/TCP can escalate his privileges and perform administrative operations.

Mitigation
Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:
• If TeleControl Server Basic is operated in standalone mode, then customers can close port 8000/tcp on the Windows firewall.
• If Telecontrol Server Basic is operated in redundancy mode, then customers can use the Windows firewall to restrict access to port 8000/tcp to the second Telecontrol Server Basics’ IP address.

Vulnerable software versions

TeleControl Server Basic: 3.1

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External links
https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-651454.pdf

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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.