CVE-2019-3464 Command injection in rssh

What is CVE-2019-3464?

CVE-2019-3464 is a critical command injection vulnerability in Canonical Ubuntu Linux, published on 6 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Insufficient sanitization of environment variables passed to rsync can bypass the restrictions imposed by rssh, a restricted shell that should restrict users to perform only rsync operations, resulting in the execution of arbitrary shell commands.

Weakness: CWE-665

Which versions are affected by CVE-2019-3464?

It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Pizzashack Rssh.

How do I fix CVE-2019-3464?

Apply the vendor's patch.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2019-3464 being exploited?

There is no known exploitation of CVE-2019-3464 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-2019-3464, GHSA-wp4w-52jh-8g3x, UBUNTU-CVE-2019-3464.