CVE-2017-5447 Use after free in Firefox
An out-of-bounds read in Firefox and Thunderbird allows attackers to crash the application or read sensitive memory, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-5447?
CVE-2017-5447 is a critical use after free vulnerability in Debian Debian Linux, published on 11 Jun 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An out-of-bounds read during the processing of glyph widths during text layout. This results in a potentially exploitable crash and could allow an attacker to read otherwise inaccessible memory. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
Weakness: CWE-416
Which versions are affected by CVE-2017-5447?
It affects 9 products.
Products include Debian Debian Linux, Mozilla Firefox, Mozilla Thunderbird, Redhat Enterprise Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server and 3 more.
How do I fix CVE-2017-5447?
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-2017-5447 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-5447 exists.
Public exploit code: 1 Exploit-DB entry.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as DEBIAN-CVE-2017-5447, GHSA-qh42-8mfg-rhvw, UBUNTU-CVE-2017-5447.