CVE-2020-8164 Possible Strong Parameters Bypass in ActionPack

Q: Which versions are affected by CVE-2020-8164?

4 open source packages ship an affected version, including actionpack. It affects 4 products.

Q: Is CVE-2020-8164 being exploited?

There is no known exploitation of CVE-2020-8164 in the wild and no public exploit code.

Q: How do I fix CVE-2020-8164?

Upgrade actionpack to a fixed version for your release line: 5.2.4.3 or 6.0.3.1.

High 7.5 Published 19 Jun 2020 Updated 4 Aug 2024

Attackers can exploit untrusted data deserialization in Rails to inadvertently leak information from Strong Parameters.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-8164?

CVE-2020-8164 is a high-severity unsafe deserialization vulnerability in Debian Debian Linux, published on 19 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A deserialization of untrusted data vulnerability exists in rails < 5.2.4.3, rails < 6.0.3.1 which can allow an attacker to supply information can be inadvertently leaked fromStrong Parameters.

Weakness: CWE-502

Which versions are affected by CVE-2020-8164?

4 open source packages ship an affected version, including actionpack. It affects 4 products.

Package	Affected	Fixed in
`actionpack` RubyGems	From `5.0.0`	`5.2.4.3`
`actionpack` RubyGems	From `5.0.0`	`5.2.4.3`
`actionpack` RubyGems	From `6.0.0`	`6.0.3.1`
`actionpack` RubyGems	From `6.0.0`	`6.0.3.1`

Linux distribution packages (6)

`rubygem-actionpack-5_1` SUSE:Linux Enterprise High Availability Extension 15	All versions	`5.1.4-3.6.1`
`rubygem-actionpack-5_1` SUSE:Linux Enterprise High Availability Extension 15 SP1	All versions	`5.1.4-3.6.1`
`rubygem-actionpack-5_1` SUSE:Linux Enterprise High Availability Extension 15 SP2	All versions	`5.1.4-3.6.1`
`rubygem-actionpack-5_1` SUSE:Package Hub 15 SP1	All versions	`5.1.4-bp151.2.3.1`
`rubygem-actionpack-5_1` openSUSE:Leap 15.1	All versions	`5.1.4-lp151.4.3.1`
`rubygem-actionpack-5_1` openSUSE:Leap 15.2	All versions	`5.1.4-lp152.5.3.1`

Products include Debian Debian Linux, Opensuse Backports Sle, Opensuse Leap, Rubyonrails Rails.

How do I fix CVE-2020-8164?

Upgrade actionpack to a fixed version for your release line: 5.2.4.3 or 6.0.3.1.

Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.

Is CVE-2020-8164 being exploited?

There is no known exploitation of CVE-2020-8164 in the wild and no public exploit code.

All Debian Debian Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2020-8164, GHSA-8727-m6gj-mc37, SUSE-SU-2020:2710-1, UBUNTU-CVE-2020-8164, openSUSE-SU-2020:1533-1, openSUSE-SU-2020:1536-1 and 1 more.