#VU56664 Modification of assumed-immutable data in SINEMA Remote Connect Server - CVE-2021-37193

Vulnerability identifier: #VU56664

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-37193

CWE-ID: CWE-471

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
SINEMA Remote Connect Server
Server applications / SCADA systems

Vendor: Siemens

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to application does not perform validation of the attacker-controlled data, assuming that data is valid and safe. A remote attacker on the local network can manipulate certain parameters and set a valid user of the affected software as invalid (or vice-versa).

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SINEMA Remote Connect Server: before 3.0

---

External links
https://cert-portal.siemens.com/productcert/pdf/ssa-334944.pdf

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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