high
7.5
CWE
400
Advisory Published
Updated

CVE-2018-1333: DoS for HTTP/2 connections by crafted requests

First published: Mon Jun 18 2018(Updated: )

Apache httpd before version 2.4.34 has a vulnerability in the handling of specially crafted HTTP/2 requests, causing workers to be allocated 60 seconds longer than necessary, leading to worker exhaustion and a denial of service. This issue only affects servers that have configured and enabled HTTP/2 support, which is not the default External References: <a href="https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-1333">https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-1333</a>

Credit: security@apache.org security@apache.org

Affected SoftwareAffected VersionHow to fix
redhat/httpd<2.4.34
2.4.34
Apache HTTP server>=2.4.18<=2.4.30
Apache HTTP server=2.4.33
Redhat Jboss Core Services=1.0
Redhat Enterprise Linux=6.0
Redhat Enterprise Linux=7.0
Canonical Ubuntu Linux=18.04
Netapp Cloud Backup
Netapp Storage Automation Store
All of
Redhat Jboss Core Services=1.0
Any of
Redhat Enterprise Linux=6.0
Redhat Enterprise Linux=7.0
debian/apache2
2.4.62-1~deb11u1
2.4.61-1~deb11u1
2.4.62-1~deb12u1
2.4.61-1~deb12u1
2.4.62-1

Remedy

http://svn.apache.org/viewvc?view=revision&revision=1828879

Remedy

http://svn.apache.org/viewvc?view=revision&revision=1832487

Remedy

https://github.com/apache/httpd/commit/808a94d0ccb3203702bdc86e2fc8961f68398fc7

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Reference Links

Frequently Asked Questions

  • What is CVE-2018-1333?

    CVE-2018-1333 is a vulnerability that allows for worker exhaustion and denial of service by crafting specially-crafted HTTP/2 requests in Apache HTTP Server.

  • How severe is CVE-2018-1333?

    CVE-2018-1333 has a severity rating of 7.5 (high).

  • Which software versions are affected by CVE-2018-1333?

    Apache HTTP Server versions 2.4.18 to 2.4.30 and version 2.4.33 are affected by CVE-2018-1333.

  • How can CVE-2018-1333 be fixed?

    CVE-2018-1333 can be fixed by upgrading to Apache HTTP Server version 2.4.34.

  • Where can I find more information about CVE-2018-1333?

    More information about CVE-2018-1333 can be found at the following references: [Link 1](https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2018-1333), [Link 2](https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1605049), [Link 3](https://httpd.apache.org/docs/2.4/mod/mod_http2.html).

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