CVE-2023-23602 Content Security Policy wasn't being correctly applied to WebSockets in WebWorkers

What is CVE-2023-23602?

CVE-2023-23602 is a medium-severity vulnerability in Mozilla Firefox, published on 2 Jun 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

Weakness: CWE-754

Which versions are affected by CVE-2023-23602?

It affects 3 products.

Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.

How do I fix CVE-2023-23602?

Upgrade to a fixed version.

Is CVE-2023-23602 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-23602 exists.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2023-23602, GHSA-457f-c77p-7wc3, OESA-2024-2057, OESA-2024-2058, OESA-2024-2120, UBUNTU-CVE-2023-23602.