[USN-3555-1] w3m vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3555-1
February 01, 2018

w3m vulnerabilities
==========================================================================

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 w3m.

Software Description:
- w3m: WWW browsable pager with excellent tables/frames support

Details:

It was discovered that w3m incorrectly handled certain inputs.
An attacker could possibly use this to cause a denial of service.
(CVE-2018-6196, CVE-2018-6197)

It was discovered that w3m incorrectly handled temporary files.
An attacker could possibly use this to overwrite arbitrary files.
(CVE-2018-6198)

Update instructions:

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

Ubuntu 17.10:
  w3m                             0.5.3-34ubuntu0.1

Ubuntu 16.04 LTS:
  w3m                             0.5.3-26ubuntu0.2

Ubuntu 14.04 LTS:
  w3m                             0.5.3-15ubuntu0.2

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

References:
  https://www.ubuntu.com/usn/usn-3555-1
  CVE-2018-6196, CVE-2018-6197, CVE-2018-6198

Package Information:
  https://launchpad.net/ubuntu/+source/w3m/0.5.3-34ubuntu0.1
  https://launchpad.net/ubuntu/+source/w3m/0.5.3-26ubuntu0.2
  https://launchpad.net/ubuntu/+source/w3m/0.5.3-15ubuntu0.2