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Ubuntu Security Notice USN-4315-1

Ubuntu Security Notice USN-4315-1
Posted Apr 2, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4315-1 - Maximilien Bourgeteau discovered that the Apport lock file was created with insecure permissions. This could allow a local attacker to escalate their privileges via a symlink attack. Maximilien Bourgeteau discovered a race condition in Apport when setting crash report permissions. This could allow a local attacker to read arbitrary files via a symlink attack.

tags | advisory, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2020-8831, CVE-2020-8833
SHA-256 | d819c4efafca8506e3f245fcae9dc7047781ae3500f6f819a3a3741e775ed104

Ubuntu Security Notice USN-4315-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4315-1
April 02, 2020

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

- Ubuntu 19.10
- 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:

Maximilien Bourgeteau discovered that the Apport lock file was created with
insecure permissions. This could allow a local attacker to escalate their
privileges via a symlink attack. (CVE-2020-8831)

Maximilien Bourgeteau discovered a race condition in Apport when setting
crash report permissions. This could allow a local attacker to read
arbitrary files via a symlink attack. (CVE-2020-8833)

Update instructions:

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

Ubuntu 19.10:
apport 2.20.11-0ubuntu8.8
python-apport 2.20.11-0ubuntu8.8
python3-apport 2.20.11-0ubuntu8.8

Ubuntu 18.04 LTS:
apport 2.20.9-0ubuntu7.14
python-apport 2.20.9-0ubuntu7.14
python3-apport 2.20.9-0ubuntu7.14

Ubuntu 16.04 LTS:
apport 2.20.1-0ubuntu2.23
python-apport 2.20.1-0ubuntu2.23
python3-apport 2.20.1-0ubuntu2.23

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

References:
https://usn.ubuntu.com/4315-1
CVE-2020-8831, CVE-2020-8833

Package Information:
https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu8.8
https://launchpad.net/ubuntu/+source/apport/2.20.9-0ubuntu7.14
https://launchpad.net/ubuntu/+source/apport/2.20.1-0ubuntu2.23
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