CVE-2018-1100 Memory corruption in zsh

What is CVE-2018-1100?

CVE-2018-1100 is a high-severity memory corruption vulnerability in Canonical Ubuntu Linux, published on 11 Apr 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

zsh through version 5.4.2 is vulnerable to a stack-based buffer overflow in the utils.c:checkmailpath function. A local attacker could exploit this to execute arbitrary code in the context of another user.

Weakness: CWE-787, CWE-120

Which versions are affected by CVE-2018-1100?

It affects 5 products.

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

How do I fix CVE-2018-1100?

Apply the vendor's patch.

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

Is CVE-2018-1100 being exploited?

There is no known exploitation of CVE-2018-1100 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-2018-1100, GHSA-hwhr-jcvf-mgf3, SUSE-SU-2018:1037-1, UBUNTU-CVE-2018-1100.