CVE-2020-8163 Remote code execution via user-provided local names in ActionView
Attackers can execute arbitrary code by controlling the locals argument in render calls within vulnerable Ruby on Rails versions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-8163?
CVE-2020-8163 is a high-severity code injection vulnerability in Debian Debian Linux, published on 2 Jul 2020. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The is a code injection vulnerability in versions of Rails prior to 5.0.1 that wouldallow an attacker who controlled the `locals` argument of a `render` call to perform a RCE.
Weakness: CWE-94
Which versions are affected by CVE-2020-8163?
3 open source packages ship an affected version, including actionview and rails. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
actionview RubyGems | All versions | 4.2.11.3 |
actionview RubyGems | All versions | 4.2.11.3 |
rails Bitnami | All versions | 5.0.1 |
Linux distribution packages (8)
rubygem-actionview-4_2 SUSE:OpenStack Cloud 6-LTSS | All versions | 4.2.9-9.9.1 |
rubygem-activesupport-4_2 SUSE:OpenStack Cloud 6-LTSS | All versions | 4.2.9-7.6.1 |
rubygem-actionview-4_2 SUSE:OpenStack Cloud 7 | All versions | 4.2.9-9.9.1 |
rubygem-activesupport-4_2 SUSE:OpenStack Cloud 7 | All versions | 4.2.9-7.6.1 |
rubygem-actionview-4_2 SUSE:OpenStack Cloud Crowbar 8 | All versions | 4.2.9-9.9.1 |
rubygem-activesupport-4_2 SUSE:OpenStack Cloud Crowbar 8 | All versions | 4.2.9-7.6.1 |
rubygem-actionview-4_2 SUSE:OpenStack Cloud Crowbar 9 | All versions | 4.2.9-9.9.1 |
rubygem-activesupport-4_2 SUSE:OpenStack Cloud Crowbar 9 | All versions | 4.2.9-7.6.1 |
Products include Debian Debian Linux, Rubyonrails Rails.
How do I fix CVE-2020-8163?
Upgrade actionview to 4.2.11.3 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2020-8163 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-8163 exists.
Public exploit code: 1 Exploit-DB entry, 1 Nuclei template and 3 proofs of concept on GitHub.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as BIT-rails-2020-8163, DEBIAN-CVE-2020-8163, GHSA-cr3x-7m39-c6jq, SUSE-SU-2020:2140-1, UBUNTU-CVE-2020-8163.