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Ubuntu Security Notice USN-3627-1
April 19, 2018

apache2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 17.10
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Apache HTTP Server.

Software Description:
- apache2: Apache HTTP server

Details:

Alex Nichols and Jakob Hirsch discovered that the Apache HTTP Server
mod_authnz_ldap module incorrectly handled missing charset encoding
headers. A remote attacker could possibly use this issue to cause the
server to crash, resulting in a denial of service. (CVE-2017-15710)

Elar Lang discovered that the Apache HTTP Server incorrectly handled
certain characters specified in <FilesMatch>. A remote attacker could
possibly use this issue to upload certain files, contrary to expectations.
(CVE-2017-15715)

It was discovered that the Apache HTTP Server mod_session module
incorrectly handled certain headers. A remote attacker could possibly use
this issue to influence session data. (CVE-2018-1283)

Robert Swiecki discovered that the Apache HTTP Server incorrectly handled
certain requests. A remote attacker could possibly use this issue to cause
the server to crash, leading to a denial of service. (CVE-2018-1301)

Robert Swiecki discovered that the Apache HTTP Server mod_cache_socache
module incorrectly handled certain headers. A remote attacker could
possibly use this issue to cause the server to crash, leading to a denial
of service. (CVE-2018-1303)

Nicolas Daniels discovered that the Apache HTTP Server incorrectly
generated the nonce when creating HTTP Digest authentication challenges.
A remote attacker could possibly use this issue to replay HTTP requests
across a cluster of servers. (CVE-2018-1312)

Update instructions:

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

Ubuntu 17.10:
  apache2-bin                     2.4.27-2ubuntu4.1

Ubuntu 16.04 LTS:
  apache2-bin                     2.4.18-2ubuntu3.8

Ubuntu 14.04 LTS:
  apache2-bin                     2.4.7-1ubuntu4.20

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

References:
  https://usn.ubuntu.com/usn/usn-3627-1
  CVE-2017-15710, CVE-2017-15715, CVE-2018-1283, CVE-2018-1301,
  CVE-2018-1303, CVE-2018-1312

Package Information:
  https://launchpad.net/ubuntu/+source/apache2/2.4.27-2ubuntu4.1
  https://launchpad.net/ubuntu/+source/apache2/2.4.18-2ubuntu3.8
  https://launchpad.net/ubuntu/+source/apache2/2.4.7-1ubuntu4.20