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Ubuntu Security Notice USN-4011-2
June 06, 2019

jinja2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Jinja2.

Software Description:
- jinja2: small but fast and easy to use stand-alone template engine

Details:

USN-4011-1 fixed several vulnerabilities in Jinja2. This update
provides the corresponding update for Ubuntu 12.04 ESM  and Ubuntu
14.04 ESM.

Original advisory details:

 Olivier Dony discovered that Jinja incorrectly handled str.format. An
 attacker could possibly use this issue to escape the sandbox.
 (CVE-2016-10745)

 Brian Welch discovered that Jinja incorrectly handled str.format_map.
 An attacker could possibly use this issue to escape the sandbox.
 (CVE-2019-10906)

Update instructions:

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

Ubuntu 14.04 ESM:
  python-jinja2                   2.7.2-2ubuntu0.1~esm1
  python3-jinja2                  2.7.2-2ubuntu0.1~esm1

Ubuntu 12.04 ESM:
  python-jinja2                   2.6-1ubuntu0.2
  python3-jinja2                  2.6-1ubuntu0.2

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

References:
  https://usn.ubuntu.com/4011-2
  https://usn.ubuntu.com/4011-1
  CVE-2016-10745, CVE-2019-10906