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-2017-0898 CVE-2017-10784 CVE-2017-14033 CVE-2017-14064 CVE-2017-17405 CVE-2017-17742 CVE-2018-6914 CVE-2018-8777 CVE-2018-8778 CVE-2018-8779 CVE-2018-8780 cve@mitre.org

Affected SoftwareAffected VersionHow to fix
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
macOS Mojave<10.14.1
10.14.1
macOS High Sierra
macOS High Sierra
macOS High Sierra<10.13.6
10.13.6
Apple El Capitan
Ruby<2.2.10
Ruby>=2.3.0<2.3.7
Ruby>=2.4.0<2.4.4
Ruby>=2.5.0<2.5.1
Ruby=2.6.0-preview1
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=17.10
Debian=7.0
Debian=8.0
Debian=9.0

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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