CVE-2018-12393 Integer overflow in Firefox

What is CVE-2018-12393?

CVE-2018-12393 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 28 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A potential vulnerability was found in 32-bit builds where an integer overflow during the conversion of scripts to an internal UTF-16 representation could result in allocating a buffer too small for the conversion. This leads to a possible out-of-bounds write. *Note: 64-bit builds are not vulnerable to this issue.*. This vulnerability affects Firefox < 63, Firefox ESR < 60.3, and Thunderbird < 60.3.

Weakness: CWE-787, CWE-190

Which versions are affected by CVE-2018-12393?

It affects 11 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird, Redhat Enterprise Linux Desktop and 5 more.

How do I fix CVE-2018-12393?

Upgrade to a fixed version.

Is CVE-2018-12393 being exploited?

There is no known exploitation of CVE-2018-12393 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2018-12393, GHSA-7372-3rg3-25vw, UBUNTU-CVE-2018-12393.