Advisory Published

USN-4458-1: Apache HTTP Server vulnerabilities

First published: Thu Aug 13 2020(Updated: )

Fabrice Perez discovered that the Apache mod_rewrite module incorrectly handled certain redirects. A remote attacker could possibly use this issue to perform redirects to an unexpected URL. (CVE-2020-1927) Chamal De Silva discovered that the Apache mod_proxy_ftp module incorrectly handled memory when proxying to a malicious FTP server. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2020-1934) Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not properly handle certain Cache-Digest headers. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-9490) Felix Wilhelm discovered that the Apache mod_proxy_uwsgi module incorrectly handled large headers. A remote attacker could use this issue to obtain sensitive information or possibly execute arbitrary code. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-11984) Felix Wilhelm discovered that the HTTP/2 implementation in Apache did not properly handle certain logging statements. A remote attacker could possibly use this issue to cause Apache to crash, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-11993)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/apache2<2.4.41-4ubuntu3.1
2.4.41-4ubuntu3.1
=20.04
All of
ubuntu/apache2-bin<2.4.41-4ubuntu3.1
2.4.41-4ubuntu3.1
=20.04
All of
ubuntu/libapache2-mod-proxy-uwsgi<2.4.41-4ubuntu3.1
2.4.41-4ubuntu3.1
=20.04
All of
ubuntu/apache2<2.4.29-1ubuntu4.14
2.4.29-1ubuntu4.14
=18.04
All of
ubuntu/apache2-bin<2.4.29-1ubuntu4.14
2.4.29-1ubuntu4.14
=18.04
All of
ubuntu/apache2<2.4.18-2ubuntu3.17
2.4.18-2ubuntu3.17
=16.04
All of
ubuntu/apache2-bin<2.4.18-2ubuntu3.17
2.4.18-2ubuntu3.17
=16.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this Apache HTTP Server vulnerability?

    The vulnerability ID for this Apache HTTP Server vulnerability is CVE-2020-1927.

  • How does the Apache mod_rewrite module handle redirects incorrectly?

    The Apache mod_rewrite module handles redirects incorrectly by allowing a remote attacker to perform redirects to an unexpected URL.

  • What is the vulnerability ID for the Apache mod_proxy_ftp vulnerability?

    The vulnerability ID for the Apache mod_proxy_ftp vulnerability is CVE-2020-11993.

  • How does the Apache mod_proxy_ftp module handle memory incorrectly?

    The Apache mod_proxy_ftp module handles memory incorrectly, which can be exploited by an attacker.

  • What are the affected versions of Apache HTTP Server?

    The affected versions of Apache HTTP Server are 2.4.41-4ubuntu3.1, 2.4.29-1ubuntu4.14, and 2.4.18-2ubuntu3.17.

  • How can I fix these Apache HTTP Server vulnerabilities?

    To fix these Apache HTTP Server vulnerabilities, update to version 2.4.41-4ubuntu3.1 for Ubuntu 20.04, version 2.4.29-1ubuntu4.14 for Ubuntu 18.04, and version 2.4.18-2ubuntu3.17 for Ubuntu 16.04.

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