N/A - USN-4171-5

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

- Ubuntu 19.10 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS

Summary:

USN-4171-1 introduced a regression in Apport.

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

Details:

USN-4171-1 fixed vulnerabilities in Apport. This caused a regression in autopkgtest and python2 compatibility. This update fixes the problem.

We apologize for the inconvenience.

Original advisory 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 2.20.11-0ubuntu8.6
python-apport 2.20.11-0ubuntu8.6
python3-apport 2.20.11-0ubuntu8.6

Ubuntu 18.04 LTS:
apport 2.20.9-0ubuntu7.12
python-apport 2.20.9-0ubuntu7.12
python3-apport 2.20.9-0ubuntu7.12

Ubuntu 16.04 LTS:
apport 2.20.1-0ubuntu2.22
python-apport 2.20.1-0ubuntu2.22
python3-apport 2.20.1-0ubuntu2.22

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

References:
https://usn.ubuntu.com/4171-5
https://usn.ubuntu.com/4171-1
https://launchpad.net/bugs/1851806, https://launchpad.net/bugs/1854237

Package Information:
https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu8.6
https://launchpad.net/ubuntu/+source/apport/2.20.9-0ubuntu7.12
https://launchpad.net/ubuntu/+source/apport/2.20.1-0ubuntu2.22