CVE-2020-8161 Directory traversal in Rack::Directory app bundled with Rack

What is CVE-2020-8161?

CVE-2020-8161 is a high-severity path traversal vulnerability in Canonical Ubuntu Linux, published on 2 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A directory traversal vulnerability exists in rack < 2.2.0 that allows an attacker perform directory traversal vulnerability in the Rack::Directory app that is bundled with Rack which could result in information disclosure.

Weakness: CWE-22, CWE-548

Which versions are affected by CVE-2020-8161?

2 open source packages ship an affected version, including rack. It affects 3 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Rack Project Rack.

How do I fix CVE-2020-8161?

Upgrade rack to 2.1.3 or later.

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

Is CVE-2020-8161 being exploited?

There is no known exploitation of CVE-2020-8161 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-2020-8161, DLA-2216-1, GHSA-5f9h-9pjv-v6j7, UBUNTU-CVE-2020-8161.