[USN-3841-1] lxml vulnerability

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Ubuntu Security Notice USN-3841-1
December 10, 2018

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

lxml could allow cross-site scripting (XSS) attacks.

Software Description:
- lxml: pythonic binding for the libxml2 and libxslt libraries

Details:

It was discovered that lxml incorrectly handled certain HTML files.
An attacker could possibly use this issue to conduct cross-site
scripting (XSS) attacks.

Update instructions:

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

Ubuntu 18.04 LTS:
  python-lxml                     4.2.1-1ubuntu0.1
  python3-lxml                    4.2.1-1ubuntu0.1

Ubuntu 16.04 LTS:
  python-lxml                     3.5.0-1ubuntu0.1
  python3-lxml                    3.5.0-1ubuntu0.1

Ubuntu 14.04 LTS:
  python-lxml                     3.3.3-1ubuntu0.2
  python3-lxml                    3.3.3-1ubuntu0.2

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

References:
  https://usn.ubuntu.com/usn/usn-3841-1
  CVE-2018-19787

Package Information:
  https://launchpad.net/ubuntu/+source/lxml/4.2.1-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/lxml/3.5.0-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/lxml/3.3.3-1ubuntu0.2