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Ubuntu Security Notice USN-4171-4

Ubuntu Security Notice USN-4171-4
Posted Nov 5, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4171-4 - USN-4171-2 fixed a vulnerability in Apport. The update caused a regression in the Python Apport library. This update fixes the problem for Ubuntu 14.04 ESM. 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. Various other issues were also addressed.

tags | advisory, local, root, python
systems | linux, ubuntu
advisories | CVE-2019-11481, CVE-2019-11482, CVE-2019-11483, CVE-2019-11485, CVE-2019-15790
MD5 | 1f07f6de70fdeb3fd7690f336bc3cfb3

Ubuntu Security Notice USN-4171-4

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4171-4
November 05, 2019

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

- Ubuntu 14.04 ESM

Summary:

USN-4171-2 introduced a regression in Apport.

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

Details:

USN-4171-2 fixed a vulnerability in Apport. The update caused a regression
in the Python Apport library. This update fixes the problem for Ubuntu 14.04 ESM.

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 14.04 ESM:
apport 2.14.1-0ubuntu3.29+esm3
python-apport 2.14.1-0ubuntu3.29+esm3
python3-apport 2.14.1-0ubuntu3.29+esm3

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

References:
https://usn.ubuntu.com/4171-4
https://usn.ubuntu.com/4171-1
https://launchpad.net/bugs/XXXXXX

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