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Ubuntu Security Notice USN-5427-1
May 17, 2022

apport vulnerabilities

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

• Ubuntu 22.04 LTS
• Ubuntu 21.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Apport.

Software Description:

• apport: automatically generate crash reports for debugging

Details:

Muqing Liu and neoni discovered that Apport incorrectly handled detecting
if an executable was replaced after a crash. A local attacker could
possibly use this issue to execute arbitrary code as the root user.
(CVE-2021-3899)

Gerrit Venema discovered that Apport incorrectly handled connections to
Apport sockets inside containers. A local attacker could possibly use this
issue to connect to arbitrary sockets as the root user. (CVE-2022-1242)

Gerrit Venema discovered that Apport incorrectly handled user settings
files. A local attacker could possibly use this issue to cause Apport to
consume resources, leading to a denial of service. (CVE-2022-28652)

Gerrit Venema discovered that Apport did not limit the amount of logging
from D-Bus connections. A local attacker could possibly use this issue to
fill up the Apport log file, leading to denial of service. (CVE-2022-28654)

Gerrit Venema discovered that Apport did not filter D-Bus connection
strings. A local attacker could possibly use this issue to cause Apport to
make arbitrary network connections. (CVE-2022-28655)

Gerrit Venema discovered that Apport did not limit the amount of memory
being consumed during D-Bus connections. A local attacker could possibly
use this issue to cause Apport to consume memory, leading to a denial of
service. (CVE-2022-28656)

Gerrit Venema discovered that Apport did not disable the python crash
handler before chrooting into a container. A local attacker could possibly
use this issue to execute arbitrary code. (CVE-2022-28657)

Gerrit Venema discovered that Apport incorrectly handled filename argument
whitespace. A local attacker could possibly use this issue to spoof
arguments to the Apport daemon. (CVE-2022-28658)

Update instructions:

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

Ubuntu 22.04 LTS:
apport 2.20.11-0ubuntu82.1
python3-apport 2.20.11-0ubuntu82.1

Ubuntu 21.10:
apport 2.20.11-0ubuntu71.2
python3-apport 2.20.11-0ubuntu71.2

Ubuntu 20.04 LTS:
apport 2.20.11-0ubuntu27.24
python3-apport 2.20.11-0ubuntu27.24

Ubuntu 18.04 LTS:
apport 2.20.9-0ubuntu7.28
python3-apport 2.20.9-0ubuntu7.28

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

References:
https://ubuntu.com/security/notices/USN-5427-1
CVE-2021-3899, CVE-2022-1242, CVE-2022-28652, CVE-2022-28654,
CVE-2022-28655, CVE-2022-28656, CVE-2022-28657, CVE-2022-28658

Package Information:
https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu82.1
https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu71.2
https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu27.24
https://launchpad.net/ubuntu/+source/apport/2.20.9-0ubuntu7.28