CVE-2024-28755: mbed tls Weak Crypto — Fix

Description

An issue was discovered in Mbed TLS 3.5.x before 3.6.0. When an SSL context was reset with the mbedtls_ssl_session_reset() API, the maximum TLS version to be negotiated was not restored to the configured one. An attacker was able to prevent an Mbed TLS server from establishing any TLS 1.3 connection, potentially resulting in a Denial of Service or forced version downgrade from TLS 1.3 to TLS 1.2.

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CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-326 CWE-326

Affected Products

Vendor	Product	Versions
arm	mbed_tls	3.5.0 — 3.6.0

References

Advisories & Patches

https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/ https://mbed-tls.readthedocs.io/en/latest/tech-updates/security-advisories/

Other References

https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 https://github.com/hey3e https://hey3e.github.io https://github.com/Mbed-TLS/mbedtls/releases/tag/v3.6.0 https://github.com/hey3e https://hey3e.github.io

Frequently Asked Questions

What is CVE-2024-28755? +

An issue was discovered in Mbed TLS 3.5.x before 3.6.0. When an SSL context was reset with the mbedtls_ssl_session_reset() API, the maximum TLS version to be negotiated was not restored to the configured one. An attacker was able to prevent an Mbed TLS server from establishing any TLS 1.3 connection, potentially resulting in a Denial of Service or forced version downgrade from TLS 1.3 to TLS 1.2. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2024-28755? +

CVE-2024-28755 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-28755? +

CVE-2024-28755 affects products from arm, specifically: mbed_tls. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-28755? +

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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