Advisory Published

USN-6509-1: Firefox vulnerabilities

First published: Thu Nov 23 2023(Updated: )

Multiple security issues were discovered in Firefox. If a user were tricked into opening a specially crafted website, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information across domains, or execute arbitrary code. (CVE-2023-6206, CVE-2023-6210, CVE-2023-6211, CVE-2023-6212, CVE-2023-6213) It was discovered that Firefox did not properly manage memory when images were created on the canvas element. An attacker could potentially exploit this issue to obtain sensitive information. (CVE-2023-6204) It discovered that Firefox incorrectly handled certain memory when using a MessagePort. An attacker could potentially exploit this issue to cause a denial of service. (CVE-2023-6205) It discovered that Firefox incorrectly did not properly manage ownership in ReadableByteStreams. An attacker could potentially exploit this issue to cause a denial of service. (CVE-2023-6207) It discovered that Firefox incorrectly did not properly manage copy operations when using Selection API in X11. An attacker could potentially exploit this issue to obtain sensitive information. (CVE-2023-6208) Rachmat Abdul Rokhim discovered that Firefox incorrectly handled parsing of relative URLS starting with "///". An attacker could potentially exploit this issue to cause a denial of service. (CVE-2023-6209)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/firefox<120.0+build2-0ubuntu0.20.04.1
120.0+build2-0ubuntu0.20.04.1
Ubuntu Ubuntu=20.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this Firefox vulnerability?

    The vulnerability ID for this Firefox vulnerability is CVE-2023-6206, CVE-2023-6210, and CVE-...

  • What are the potential impacts of these vulnerabilities?

    The potential impacts of these vulnerabilities include denial of service, information disclosure, and remote code execution.

  • How can an attacker exploit these vulnerabilities?

    An attacker can exploit these vulnerabilities by tricking a user into opening a specially crafted website.

  • What is the recommended version of Firefox to fix these vulnerabilities?

    To fix these vulnerabilities, it is recommended to update Firefox to version 120.0+build2-0ubuntu0.20.04.1.

  • Where can I find more information about these vulnerabilities?

    You can find more information about these vulnerabilities on the Ubuntu security website: [CVE-2023-6207](https://ubuntu.com/security/CVE-2023-6207), [CVE-2023-6213](https://ubuntu.com/security/CVE-2023-6213), [CVE-2023-6210](https://ubuntu.com/security/CVE-2023-6210).

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