Ubuntu Security Update USN-3279-1: Apache HTTP Server vulnerabilities


Apr 25, 2017
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Ubuntu Security Notice USN-3279-1

9th May, 2017

apache2 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Several security issues were fixed in Apache HTTP Server.

Software description

  • apache2 - Apache HTTP server

It was discovered that the Apache mod_session_crypto module was encrypting
data and cookies using either CBC or ECB modes. A remote attacker could
possibly use this issue to perform padding oracle attacks. (CVE-2016-0736)

Maksim Malyutin discovered that the Apache mod_auth_digest module
incorrectly handled malicious input. A remote attacker could possibly use
this issue to cause Apache to crash, resulting in a denial of service.

David Dennerline and Régis Leroy discovered that the Apache HTTP Server
incorrectly handled unusual whitespace when parsing requests, contrary to
specifications. When being used in combination with a proxy or backend
server, a remote attacker could possibly use this issue to perform an
injection attack and pollute cache. This update may introduce compatibility
issues with clients that do not strictly follow HTTP protocol
specifications. A new configuration option "HttpProtocolOptions Unsafe" can
be used to revert to the previous unsafe behaviour in problematic
environments. (CVE-2016-8743)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 16.10:
apache2-bin 2.4.18-2ubuntu4.1
Ubuntu 16.04 LTS:
apache2-bin 2.4.18-2ubuntu3.2
Ubuntu 14.04 LTS:
apache2-bin 2.4.7-1ubuntu4.14

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

In general, a standard system update will make all the necessary changes.


CVE-2016-0736, CVE-2016-2161, CVE-2016-8743

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