critical
9.1
CWE
22
Advisory Published
CVE Published
Updated

CVE-2018-8780: Path Traversal

First published: Thu Mar 29 2018(Updated: )

Dir.open, Dir.new, Dir.entries and Dir.empty? accept the path of the target directory as their parameter. If the parameter contains NUL (\0) bytes, these methods recognize that the path is completed before the NUL bytes. So, if a script accepts an external input as the argument of these methods, the attacker can make the unintentional directory traversal. Affected versions: Ruby 2.2 series: 2.2.9 and earlier Ruby 2.3 series: 2.3.6 and earlier Ruby 2.4 series: 2.4.3 and earlier Ruby 2.5 series: 2.5.0 and earlier External References: <a href="https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-dir-cve-2018-8780/">https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-dir-cve-2018-8780/</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Ruby-lang Ruby<2.2.10
Ruby-lang Ruby>=2.3.0<2.3.7
Ruby-lang Ruby>=2.4.0<2.4.4
Ruby-lang Ruby>=2.5.0<2.5.1
Ruby-lang Ruby=2.6.0-preview1
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=17.10
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Apple macOS Mojave<10.14.1
10.14.1
Apple High Sierra
Apple Sierra
Apple macOS High Sierra<10.13.6
10.13.6
Apple El Capitan
redhat/ruby<2.2.10
2.2.10
redhat/ruby<2.3.7
2.3.7
redhat/ruby<2.4.4
2.4.4
redhat/ruby<2.5.1
2.5.1
debian/ruby1.8
debian/ruby1.9.1
debian/ruby2.1
debian/ruby2.5

Remedy

https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-2-10-released/

Remedy

https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-3-7-released/

Remedy

https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-4-4-released/

Remedy

https://www.ruby-lang.org/en/news/2018/03/28/ruby-2-5-1-released/

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2018-8780?

    CVE-2018-8780 is a vulnerability in Ruby that allows for unintended directory traversal.

  • What is the severity of CVE-2018-8780?

    The severity of CVE-2018-8780 is critical with a CVSS score of 9.1.

  • Which versions of Ruby are affected by CVE-2018-8780?

    Versions before 2.2.10, 2.3.x before 2.3.7, 2.4.x before 2.4.4, 2.5.x before 2.5.1, and 2.6.0-preview1 are affected by CVE-2018-8780.

  • How can I fix CVE-2018-8780?

    To fix CVE-2018-8780, update Ruby to version 2.2.10, 2.3.7, 2.4.4, 2.5.1, or 2.6.0-preview1.

  • Where can I find more information about CVE-2018-8780?

    You can find more information about CVE-2018-8780 at the following references: [Link 1](https://www.ruby-lang.org/en/news/2018/03/28/poisoned-nul-byte-dir-cve-2018-8780/), [Link 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1561957), [Link 3](https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62989).

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