CVE-2019-19344 Use after free in samba

What is CVE-2019-19344?

CVE-2019-19344 is a medium-severity use after free vulnerability in Canonical Ubuntu Linux, published on 21 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

There is a use-after-free issue in all samba 4.9.x versions before 4.9.18, all samba 4.10.x versions before 4.10.12 and all samba 4.11.x versions before 4.11.5, essentially due to a call to realloc() while other local variables still point at the original buffer.

Weakness: CWE-416

Which versions are affected by CVE-2019-19344?

It affects 7 products.

Products include Canonical Ubuntu Linux, Opensuse Leap, Samba Samba, Synology Directory Server, Synology Diskstation Manager, Synology Router Manager and 1 more.

How do I fix CVE-2019-19344?

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-2019-19344 being exploited?

There is no known exploitation of CVE-2019-19344 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 ALPINE-CVE-2019-19344, DEBIAN-CVE-2019-19344, ECHO-3782-fa30-3960, GHSA-932g-58jj-wp5q.