CVE-2019-17026 Mozilla Firefox And Thunderbird Type Confusion

What is CVE-2019-17026?

CVE-2019-17026 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 2 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

Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.

Weakness: CWE-843

Which versions are affected by CVE-2019-17026?

It affects 3 products.

Products include Canonical Ubuntu Linux, Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2019-17026?

Upgrade to a fixed version. US federal agencies must fix it by 3 May 2022.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-17026 being exploited?

Yes. Attackers have exploited CVE-2019-17026 in the wild since at least 3 Nov 2021.

Public exploit code: 1 Exploit-DB entry and 2 proofs of concept on GitHub.

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-2019-17026, DLA-2093-1, GHSA-9m3f-27xq-x4j5, UBUNTU-CVE-2019-17026.