TLS Private Key Accessible to External Parties - CEV-2023-2538

CVE-2023-2538

Summary

A CWE-552 "Files or Directories Accessible to External Parties” in the web interface of the Tyan S5552 BMC version 3.00 allows an attacker to retrieve the private key of the TLS certificate in use by the BMC via forced browsing.

Impact

An unauthenticated remote attacker would be able to perform Man-in-the-Middle (MitM) attacks against victims that access the web interface through HTTPS.

Issue Date

July 5, 2023

Affects

The vulnerability affects: Tyan S5552 BMC version 3.00

CVE Name

CVE-2023-2538

CVSS Details

CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

CVSS Score

6.3

Solution

The affected component has reached end of life. It is suggested to replace it with a supported equivalent.

Mitigations

Acknowledgements

Andrea Palanca of Nozomi Networks

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Research Projects

TRITON

TRITON is the first known cyberattack that directly interacted with a Safety Instrumented System (SIS). Labs reverse engineered the TriStation suite of software and delivered a report and two free tools for security researchers. This research was presented at Black Hat USA 2018.

GreyEnergy

The Labs team reverse engineered the GreyEnergy malicious document (maldoc) that leads to the installation of the malware (backdoor) on a victim’s network. Project outcomes include a report, multiple blogs and two free tools for security researchers.

IEC 62351

IEC Working Group 15 (WG15) is developing technology standards for secure-by-design power systems. Labs contributes to the standards and has demonstrated how they can be used to identify hard-to-detect cyberattacks. Research from this effort was presented at Black Hat USA 2019.

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