CVE-2019-16255: Code Injection
First published: Wed Nov 20 2019(Updated: )
Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows code injection if the first argument (aka the "command" argument) to Shell#[] or Shell#test in lib/shell.rb is untrusted data. An attacker can exploit this to call an arbitrary Ruby method.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/rh-ruby25-ruby | <0:2.5.9-9.el7 | 0:2.5.9-9.el7 |
| redhat/rh-ruby26-ruby | <0:2.6.7-119.el7 | 0:2.6.7-119.el7 |
| redhat/ruby | <2.4.8 | 2.4.8 |
| redhat/ruby | <2.5.7 | 2.5.7 |
| redhat/ruby | <2.6.5 | 2.6.5 |
| redhat/ruby | <2.7.0 | 2.7.0 |
| ubuntu/jruby | <1.5.6-9+ | 1.5.6-9+ |
| ubuntu/ruby2.3 | <2.3.1-2~ubuntu16.04.14 | 2.3.1-2~ubuntu16.04.14 |
| ubuntu/ruby2.5 | <2.5.1-1ubuntu1.6 | 2.5.1-1ubuntu1.6 |
| ubuntu/ruby2.5 | <2.5.5-1ubuntu1.1 | 2.5.5-1ubuntu1.1 |
| ubuntu/ruby2.5 | <2.5.5-4ubuntu2.1 | 2.5.5-4ubuntu2.1 |
| ubuntu/ruby2.5 | <2.5.7-1 | 2.5.7-1 |
| debian/jruby | 9.3.9.0+ds-8 9.4.8.0+ds-1 | |
| ruby-lang Ruby | >=2.4.0<=2.4.7 | |
| ruby-lang Ruby | >=2.5.0<=2.5.6 | |
| ruby-lang Ruby | >=2.6.0<=2.6.4 | |
| Debian Debian Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| openSUSE | =15.1 | |
| Oracle GraalVM Enterprise Edition | =19.3.0.2 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2019-16255 https://nvd.nist.gov/vuln/detail/CVE-2019-16255
- https://bugzilla.redhat.com/show_bug.cgi?id=1793683
- https://access.redhat.com/errata/RHSA-2021:2587
- https://access.redhat.com/errata/RHSA-2021:2588
- https://access.redhat.com/errata/RHSA-2022:0581
- https://access.redhat.com/errata/RHSA-2022:0582
- https://access.redhat.com/errata/RHSA-2021:2104
- https://access.redhat.com/errata/RHSA-2021:2230
- https://access.redhat.com/security/cve/cve-2019-16255
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.html
- https://hackerone.com/reports/327512
- https://lists.debian.org/debian-lts-announce/2019/11/msg00025.html
- https://lists.debian.org/debian-lts-announce/2019/12/msg00009.html
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.html
- https://lists.debian.org/debian-lts-announce/2023/04/msg00033.html
- https://seclists.org/bugtraq/2019/Dec/31
- https://seclists.org/bugtraq/2019/Dec/32
- https://security.gentoo.org/glsa/202003-06
- https://www.debian.org/security/2019/dsa-4587
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://www.ruby-lang.org/ja/news/2019/10/01/code-injection-shell-test-cve-2019-16255/
- https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-4-8-released/
- https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-5-7-released/
- https://www.ruby-lang.org/ja/news/2019/10/01/ruby-2-6-5-released/
- https://launchpad.net/bugs/cve/CVE-2019-16255
- https://www.ruby-lang.org/en/news/2019/10/01/code-injection-shell-test-cve-2019-16255/
- https://github.com/ruby/ruby/commit/d6adc68dc9c74a33b3ca012af171e2d59f0dea10
- https://github.com/ruby/shell/commit/5d8223f9b4695121ec1ba2e1eabca414f33c6252
- https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-6-5-released/
- https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-5-7-released/
- https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-4-8-released/
- https://ruby-doc.org/stdlib-2.6.5/libdoc/shell/rdoc/Shell/CommandProcessor.html#method-i-test
- https://ruby-doc.org/core-2.6.5/FileTest.html
- https://github.com/ruby/ruby/commit/3af01ae1101e0b8815ae5a106be64b0e82a58640
- https://security-tracker.debian.org/tracker/CVE-2019-16255
- https://ubuntu.com/security/notices/USN-4201-1
- https://www.cve.org/CVERecord?id=CVE-2019-16255
- https://nvd.nist.gov/vuln/detail/CVE-2019-16255
- https://ubuntu.com/security/CVE-2019-16255
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2019-16255?
CVE-2019-16255 is a vulnerability in Ruby versions 2.4.7 through 2.6.4 that allows code injection if untrusted data is passed as the first argument to Shell#[] or Shell#test.
How severe is CVE-2019-16255?
CVE-2019-16255 has a severity score of 8.1 (high).
What is the affected software of CVE-2019-16255?
The affected software of CVE-2019-16255 includes Ruby versions 2.4.7 to 2.6.4.
How can an attacker exploit CVE-2019-16255?
An attacker can exploit CVE-2019-16255 by passing untrusted data as the first argument to Shell#[] or Shell#test.
Are there any remediation steps for CVE-2019-16255?
Yes, the recommended remediation steps for CVE-2019-16255 are to upgrade Ruby to version 2.4.8, 2.5.7, or 2.6.5.
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