#VU58081 Out-of-bounds read in Siemens products - CVE-2021-31881

Vulnerability identifier: #VU58081

Vulnerability risk: Medium

CVSSv4.0: 5 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-31881

CWE-ID: CWE-125

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Nucleus NET
Server applications / Other server solutions
Nucleus Source Code
Server applications / Other server solutions
Capital VSTAR
Server applications / Other server solutions
Nucleus ReadyStart
Server applications / Other server solutions

Vendor: Siemens

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition. A remote attacker on the local network can create a specially crafted file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system or cause a denial of service (DoS) condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nucleus NET: All versions

Nucleus Source Code: All versions

Capital VSTAR: All versions

Nucleus ReadyStart: before 4.1.1

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-044112.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 local network (LAN).

Is there known malware, which exploits this vulnerability?

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