CVE-2024-25140: rustdesk Cert Validation Flaw — Exploit

Description

A default installation of RustDesk 1.2.3 on Windows places a WDKTestCert certificate under Trusted Root Certification Authorities with Enhanced Key Usage of Code Signing (1.3.6.1.5.5.7.3.3), valid from 2023 until 2033. This is potentially unwanted, e.g., because there is no public documentation of security measures for the private key, and arbitrary software could be signed if the private key were to be compromised. NOTE: the vendor's position is "we do not have EV cert, so we use test cert as a workaround." Insertion into Trusted Root Certification Authorities was the originally intended behavior, and the UI ensured that the certificate installation step (checked by default) was visible to the user before proceeding with the product installation.

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CVSS v3.1 Score

9.8

CRITICAL

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

Weakness Type (CWE)

CWE-295 CWE-295

Affected Products

Vendor	Product	Versions
rustdesk	rustdesk	All
microsoft	windows	All

References

Exploits

https://github.com/rustdesk/rustdesk/discussions/6444 https://github.com/rustdesk/rustdesk/discussions/6444

Other References

https://news.ycombinator.com/item?id=39256493 https://serverfault.com/questions/837994 https://news.ycombinator.com/item?id=39256493 https://serverfault.com/questions/837994

Frequently Asked Questions

What is CVE-2024-25140? +

A default installation of RustDesk 1.2.3 on Windows places a WDKTestCert certificate under Trusted Root Certification Authorities with Enhanced Key Usage of Code Signing (1.3.6.1.5.5.7.3.3), valid from 2023 until 2033. This is potentially unwanted, e.g., because there is no public documentation of security measures for the private key, and arbitrary software could be signed if the private key were to be compromised. NOTE: the vendor's position is "we do not have EV cert, so we use test cert as a workaround." Insertion into Trusted Root Certification Authorities was the originally intended behavior, and the UI ensured that the certificate installation step (checked by default) was visible to the user before proceeding with the product installation. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2024-25140? +

CVE-2024-25140 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2024-25140? +

CVE-2024-25140 affects products from microsoft, rustdesk, specifically: rustdesk, windows. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-25140? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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