[USN-4171-1] Apport vulnerabilities

[Alex Murray]

==========================================================================
Ubuntu Security Notice USN-4171-1
October 30, 2019

apport vulnerabilities
==========================================================================

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

- Ubuntu 19.10
- Ubuntu 19.04
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Apport.

Software Description:
- apport: automatically generate crash reports for debugging

Details:

Kevin Backhouse discovered Apport would read its user-controlled settings
file as the root user. This could be used by a local attacker to possibly
crash Apport or have other unspecified consequences. (CVE-2019-11481)

Sander Bos discovered a race-condition in Apport during core dump
creation. This could be used by a local attacker to generate a crash report
for a privileged process that is readable by an unprivileged user.
(CVE-2019-11482)

Sander Bos discovered Apport mishandled crash dumps originating from
containers. This could be used by a local attacker to generate a crash
report for a privileged process that is readable by an unprivileged user.
(CVE-2019-11483)

Sander Bos discovered Apport mishandled lock-file creation. This could be
used by a local attacker to cause a denial of service against Apport.
(CVE-2019-11485)

Kevin Backhouse discovered Apport read various process-specific files with
elevated privileges during crash dump generation. This could could be used
by a local attacker to generate a crash report for a privileged process
that is readable by an unprivileged user. (CVE-2019-15790)

Update instructions:

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

Ubuntu 19.10:
  apport                          2.20.11-0ubuntu8.1
  python-apport                   2.20.11-0ubuntu8.1
  python3-apport                  2.20.11-0ubuntu8.1

Ubuntu 19.04:
  apport                          2.20.10-0ubuntu27.2
  python-apport                   2.20.10-0ubuntu27.2
  python3-apport                  2.20.10-0ubuntu27.2

Ubuntu 18.04 LTS:
  apport                          2.20.9-0ubuntu7.8
  python-apport                   2.20.9-0ubuntu7.8
  python3-apport                  2.20.9-0ubuntu7.8

Ubuntu 16.04 LTS:
  apport                          2.20.1-0ubuntu2.20
  python-apport                   2.20.1-0ubuntu2.20
  python3-apport                  2.20.1-0ubuntu2.20

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

References:
  https://usn.ubuntu.com/4171-1
  CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485,
  CVE-2019-15790

Package Information:
  https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu8.1
  https://launchpad.net/ubuntu/+source/apport/2.20.10-0ubuntu27.2
  https://launchpad.net/ubuntu/+source/apport/2.20.9-0ubuntu7.8
  https://launchpad.net/ubuntu/+source/apport/2.20.1-0ubuntu2.20
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