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Ubuntu Security Notice USN-4247-3
January 23, 2020
python-apt vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 14.04 ESM
– Ubuntu 12.04 ESM
Summary:
Several security issues were fixed in python-apt.
Software Description:
– python-apt: Python interface to libapt-pkg
Details:
USN-4247-1 fixed several vulnerabilities in python-apt. This update
provides the corresponding updates for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.
Original advisory details:
It was discovered that python-apt would still use MD5 hashes to validate
certain downloaded packages. If a remote attacker were able to perform a
man-in-the-middle attack, this flaw could potentially be used to install
altered packages. (CVE-2019-15795)
It was discovered that python-apt could install packages from untrusted
repositories, contrary to expectations. (CVE-2019-15796)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 14.04 ESM:
python-apt 0.9.3.5ubuntu3+esm2
python3-apt 0.9.3.5ubuntu3+esm2
Ubuntu 12.04 ESM:
python-apt 0.8.3ubuntu7.5
python3-apt 0.8.3ubuntu7.5
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4247-3
https://usn.ubuntu.com/4247-1
CVE-2019-15795, CVE-2019-15796
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