#VU23006 Input validation error in Ruby - CVE-2019-15845
Published: November 26, 2019 / Updated: February 7, 2020
Vulnerability identifier: #VU23006
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-15845
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Ruby
Ruby
Software vendor:
Ruby
Ruby
Description
The vulnerability allows a remote attacker to bypass certain security restrictions.
The vulnerability exists in Ruby due to insufficient validation of user-supplied files within File.fnmatch and File.fnmatch? functions when processing NUL byte in the filename. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the system.
Remediation
Install updates from vendor's website.
External links
- https://hackerone.com/reports/44961
- https://www.ruby-lang.org/en/news/2019/10/01/ruby-2-4-8-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-2-6-5-released/
- https://www.ruby-lang.org/en/news/2019/10/01/nul-injection-file-fnmatch-cve-2019-15845/