Python-apt doesn't check if hashes are signed in `Version.fetch_binary()` and `Version.fetch_source()` of apt/package.py or in `_fetch_archives()` of apt/cache.py in version 1.9.3ubuntu2 and earlier. This allows downloads from unsigned repositories which shouldn't be allowed and has been fixed in verisions 1.9.5, 1.9.0ubuntu1.2, 1.6.5ubuntu0.1, 1.1.0~beta1ubuntu0.16.04.7, 0.9.3.5ubuntu3+esm2, and 0.8.3ubuntu7.5.

Two security issues were found in the Python interface to the apt package manager; package downloads from unsigned repositories were incorrectly rejected and the hash validation relied on MD5.

Several issues have been found in python-apt, a python interface to libapt-pkg.

CVE-2019-15795

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-2019-15796

It was discovered that python-apt could install packages from untrusted repositories, contrary to expectations.

For Debian 8 'Jessie', these problems have been fixed in version 0.9.3.13.

We recommend that you upgrade your python-apt packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS / 18.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-4247-1 advisory.

    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 machine-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)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
133230	Debian DSA-4609-1 : python-apt - security update	Nessus	Debian Local Security Checks	medium
133219	Debian DLA-2074-1 : python-apt security update	Nessus	Debian Local Security Checks	medium
133205	Ubuntu 16.04 LTS / 18.04 LTS : python-apt vulnerabilities (USN-4247-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2019-15796

medium

Tenable Plugins

medium

medium

medium