CVE-2024-7524: firefox XSS — Fix

Description

Firefox adds web-compatibility shims in place of some tracking scripts blocked by Enhanced Tracking Protection. On a site protected by Content Security Policy in "strict-dynamic" mode, an attacker able to inject an HTML element could have used a DOM Clobbering attack on some of the shims and achieved XSS, bypassing the CSP strict-dynamic protection. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1.

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CVSS v3.1 Score

6.1

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 129.0
mozilla	firefox_esr	< 115.14
mozilla	firefox_esr	116.0 — 128.1

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=1909241

Frequently Asked Questions

What is CVE-2024-7524? +

Firefox adds web-compatibility shims in place of some tracking scripts blocked by Enhanced Tracking Protection. On a site protected by Content Security Policy in "strict-dynamic" mode, an attacker able to inject an HTML element could have used a DOM Clobbering attack on some of the shims and achieved XSS, bypassing the CSP strict-dynamic protection. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, and Firefox ESR < 128.1. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2024-7524? +

CVE-2024-7524 has a CVSS v3.1 score of 6.1 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-2024-7524? +

CVE-2024-7524 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-2024-7524? +

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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