high
7.5
CWE
400
Advisory Published
CVE Published
Updated

CVE-2018-8777

First published: Thu Mar 29 2018(Updated: )

If an attacker sends a large request which contains huge HTTP headers, WEBrick try to process it on memory, so the request causes the out-of-memory DoS attack. 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/large-request-dos-in-webrick-cve-2018-8777/">https://www.ruby-lang.org/en/news/2018/03/28/large-request-dos-in-webrick-cve-2018-8777/</a>

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

Affected SoftwareAffected VersionHow to fix
Ruby-lang Ruby>=2.2.0<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
Debian Debian Linux=7.0
Debian Debian Linux=8.0
Debian Debian Linux=9.0
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=17.10
Redhat Enterprise Linux=6.0
Redhat Enterprise Linux=7.0
Redhat Enterprise Linux=7.4
Redhat Enterprise Linux=7.5
Redhat Enterprise Linux=7.6
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 the severity of CVE-2018-8777?

    The severity of CVE-2018-8777 is high with a severity value of 7.5.

  • How can an attacker exploit CVE-2018-8777?

    An attacker can exploit CVE-2018-8777 by sending a large HTTP request with a crafted header to a WEBrick server or a crafted body to a WEBrick server/handler, causing a denial of service (memory consumption).

  • Which versions of Ruby are affected by CVE-2018-8777?

    Ruby 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-2018-8777.

  • How do I fix the vulnerability CVE-2018-8777 in Ruby?

    To fix the vulnerability CVE-2018-8777 in Ruby, update to version 2.2.10, 2.3.7, 2.4.4, 2.5.1, or a later version.

  • Where can I find more information about CVE-2018-8777?

    You can find more information about CVE-2018-8777 at the following references: [1] [2] [3]

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