CVE-2020-6807 Use after free in Firefox
A use-after-free vulnerability in Firefox and Thunderbird allows attackers to cause a crash or potentially execute arbitrary code via stream destruction race conditions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2020-6807?
CVE-2020-6807 is a high-severity use after free vulnerability in Canonical Ubuntu Linux, published on 25 Mar 2020. 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
When a device was changed while a stream was about to be destroyed, the <code>stream-reinit</code> task may have been executed after the stream was destroyed, causing a use-after-free and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.
Weakness: CWE-416
Which versions are affected by CVE-2020-6807?
It affects 4 products.
Products include Canonical Ubuntu Linux, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2020-6807?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2020-6807 being exploited?
There is no known exploitation of CVE-2020-6807 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2020-6807, GHSA-v7mh-jh5r-f65h, UBUNTU-CVE-2020-6807.