CVE-2019-16255
HIGHCVSS 8.1/10EPSS 4.22%
Last modified
CVE-2019-16255 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 4.22% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| 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 | Leap | 15.1 |
| Oracle | Graalvm | 19.3.0.2 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.htmlThird Party Advisory
- https://hackerone.com/reports/327512Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/11/msg00025.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/12/msg00009.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Dec/31Broken Link, Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Dec/32Broken Link, Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202003-06Third Party Advisory
- https://www.debian.org/security/2019/dsa-4587Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2020.htmlPatch, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00041.htmlThird Party Advisory
- https://hackerone.com/reports/327512Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/11/msg00025.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/12/msg00009.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/08/msg00027.htmlMailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Dec/31Broken Link, Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Dec/32Broken Link, Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202003-06Third Party Advisory
- https://www.debian.org/security/2019/dsa-4587Third Party Advisory
- https://www.oracle.com/security-alerts/cpujan2020.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-16255?
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.
How severe is CVE-2019-16255?
CVE-2019-16255 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 4.22% probability of exploitation in the next 30 days.
How do I fix CVE-2019-16255?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-16255?
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Scan your code nowSource: NVD / NIST