CVE-2019-17008 Use after free in Firefox
A use-after-free in nested workers allows attackers to cause a crash or potentially execute code in Firefox and Thunderbird.
- 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-2019-17008?
CVE-2019-17008 is a high-severity use after free vulnerability in Mozilla Firefox, published on 8 Jan 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 using nested workers, a use-after-free could occur during worker destruction. This resulted in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.
Weakness: CWE-416
Which versions are affected by CVE-2019-17008?
It affects 4 products.
Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird, Opensuse Leap.
How do I fix CVE-2019-17008?
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-2019-17008 being exploited?
There is no known exploitation of CVE-2019-17008 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2019-17008, GHSA-vm87-9hjc-x68w, UBUNTU-CVE-2019-17008.