#VU57663 Out-of-bounds read in V-Server Lite and Tellus Lite V-Simulator - CVE-2021-38421

Vulnerability identifier: #VU57663

Vulnerability risk: High

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-38421

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
V-Server Lite
Server applications / Web servers
Tellus Lite V-Simulator
Server applications / Other server solutions

Vendor: Fuji Electric

Description

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

The vulnerability exists due to a boundary condition within the parsing of V8 files within the V-Simulator module. A remote attacker can trigger out-of-bounds read error and read contents of memory on the system, or perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

V-Server Lite: before 4.0.12.0

Tellus Lite V-Simulator: before 4.0.12.0

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External links
https://ics-cert.us-cert.gov/advisories/icsa-21-299-01
https://www.zerodayinitiative.com/advisories/ZDI-21-1264/

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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.