CVE-2024-7531: firefox — Fix

Description

Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1.

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CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-367 CWE-367

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 129.0
mozilla	firefox_esr	< 115.14.0
mozilla	firefox_esr	All

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2024-33/ https://www.mozilla.org/security/advisories/mfsa2024-34/ https://www.mozilla.org/security/advisories/mfsa2024-35/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=1905691

Frequently Asked Questions

What is CVE-2024-7531? +

Calling `PK11_Encrypt()` in NSS using CKM_CHACHA20 and the same buffer for input and output can result in plaintext on an Intel Sandy Bridge processor. In Firefox this only affects the QUIC header protection feature when the connection is using the ChaCha20-Poly1305 cipher suite. The most likely outcome is connection failure, but if the connection persists despite the high packet loss it could be possible for a network observer to identify packets as coming from the same source despite a network path change. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2024-7531? +

CVE-2024-7531 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-2024-7531? +

CVE-2024-7531 affects products from mozilla, specifically: firefox, firefox_esr. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-7531? +

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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