CVE-2020-8793 Path traversal in n/a

What is CVE-2020-8793?

CVE-2020-8793 is a medium-severity path traversal vulnerability in Canonical Ubuntu Linux, published on 25 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

OpenSMTPD before 6.6.4 allows local users to read arbitrary files (e.g., on some Linux distributions) because of a combination of an untrusted search path in makemap.c and race conditions in the offline functionality in smtpd.c.

Weakness: CWE-426, CWE-367

Which versions are affected by CVE-2020-8793?

It affects 3 products.

Products include Canonical Ubuntu Linux, Fedoraproject Fedora, Opensmtpd Opensmtpd.

How do I fix CVE-2020-8793?

Upgrade to a fixed version.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2020-8793 being exploited?

There is no known exploitation of CVE-2020-8793 in the wild and no public exploit code.

Public exploit code: 1 Exploit-DB entry.

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-2020-8793, GHSA-m2cf-xghm-rxmc, UBUNTU-CVE-2020-8793.