CVE-2018-1139 Weak cryptography in samba

What is CVE-2018-1139?

CVE-2018-1139 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 22 Aug 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.

Weakness: CWE-522, CWE-20

Which versions are affected by CVE-2018-1139?

It affects 5 products.

Products include Canonical Ubuntu Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation, Samba Samba.

How do I fix CVE-2018-1139?

Upgrade to a fixed version.

Is CVE-2018-1139 being exploited?

There is no known exploitation of CVE-2018-1139 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-2018-1139, DEBIAN-CVE-2018-1139, ECHO-6033-31eb-730e, GHSA-xxm3-fp55-pm48, UBUNTU-CVE-2018-1139.