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Ubuntu Security Notice USN-3504-2
December 05, 2017

libxml2 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

curl could be made to crash if it received specially crafted
input.

Software Description:
- libxml2: GNOME XML library

Details:

USN-3504-1 fixed a vulnerability in libxml2. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

Wei Lei discovered that libxml2 incorrecty handled certain parameter
entities. An attacker could use this issue with specially constructed
XML data to cause libxml2 to consume resources, leading to a denial of
service.

Update instructions:

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

Ubuntu 12.04 ESM:
 libxml2=C2=A02.7.8.dfsg-5.1ubuntu4.19
 libxml2-utils2.7.8.dfsg-5.1ubuntu4.19
 python-libxml22.7.8.dfsg-5.1ubuntu4.19

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

References:
 https://www.ubuntu.com/usn/usn-3504-2
 https://www.ubuntu.com/usn/usn-3504-1
 CVE-2017-16932