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AUSCERT External Security Bulletin Redistribution
ESB-2020.4346.3
USN-4668-1: python-apt vulnerability
5 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: python-apt
Publisher: Ubuntu
Operating System: Ubuntu
Linux variants
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27351
Original Bulletin:
https://ubuntu.com/security/notices/USN-4668-1
https://ubuntu.com/security/notices/USN-4668-2
https://ubuntu.com/security/notices/USN-4668-3
Comment: This bulletin contains three (3) Ubuntu security advisories.
This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running python-apt check for an updated version of the software for
their operating system.
Revision History: January 5 2021: Vendor introduced USN-4668-3: python-apt regression
December 10 2020: Vendor introduced USN-4668-2: python-apt regression
December 10 2020: Initial Release
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USN-4668-3: python-apt regression
04 January 2021
USN-4668-1 introduced a regression in python-apt.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o python-apt - Python interface to libapt-pkg
Details
USN-4668-1 fixed vulnerabilities in python-apt. The update caused a
regression when using certain APIs with a file handle. This update fixes
the problem.
We apologize for the inconvenience.
Original advisory details:
Kevin Backhouse discovered that python-apt incorrectly handled resources. A
local attacker could possibly use this issue to cause python-apt to consume
resources, leading to a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o python3-apt - 2.1.3ubuntu1.3
Ubuntu 20.04
o python-apt - 2.0.0ubuntu0.20.04.3
o python3-apt - 2.0.0ubuntu0.20.04.3
Ubuntu 18.04
o python-apt - 1.6.5ubuntu0.5
o python3-apt - 1.6.5ubuntu0.5
Ubuntu 16.04
o python-apt - 1.1.0~beta1ubuntu0.16.04.11
o python3-apt - 1.1.0~beta1ubuntu0.16.04.11
In general, a standard system update will make all the necessary changes.
References
o https://launchpad.net/bugs/1907676
- ------------------------------------------------------------------------------------------------------
USN-4668-1: python-apt vulnerability
09 December 2020
python-apt could be made to crash if it opened a specially crafted file.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o python-apt - Python interface to libapt-pkg
Details
Kevin Backhouse discovered that python-apt incorrectly handled resources. A
local attacker could possibly use this issue to cause python-apt to consume
resources, leading to a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o python3-apt - 2.1.3ubuntu1.1
Ubuntu 20.04
o python-apt - 2.0.0ubuntu0.20.04.2
o python3-apt - 2.0.0ubuntu0.20.04.2
Ubuntu 18.04
o python-apt - 1.6.5ubuntu0.4
o python3-apt - 1.6.5ubuntu0.4
Ubuntu 16.04
o python-apt - 1.1.0~beta1ubuntu0.16.04.10
o python3-apt - 1.1.0~beta1ubuntu0.16.04.10
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-27351
- ------------------------------------------------------------------------------
USN-4668-2: python-apt regression
10 December 2020
USN-4668-1 introduced a regression in python-apt.
Releases
o Ubuntu 20.10
Packages
o python-apt - Python interface to libapt-pkg
Details
USN-4668-1 fixed vulnerabilities in python-apt. That update caused a
regression by removing information describing the Ubuntu 20.10 release from
the Ubuntu templates. This update fixes the problem by restoring this
information.
We apologize for the inconvenience.
Original advisory details:
Kevin Backhouse discovered that python-apt incorrectly handled resources. A
local attacker could possibly use this issue to cause python-apt to consume
resources, leading to a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o python3-apt - 2.1.3ubuntu1.2
In general, a standard system update will make all the necessary changes.
References
o https://launchpad.net/bugs/1907496
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