Auth bypass in Canonical Python-Apt
CVE-2019-15796
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (43.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Canonical Python-Apt — versions 0.8.3, 0.9.3.5, 1.1.0
- Canonical Ubuntu Linux — versions 12.04, 14.04, 16.04
- Debian Python-Apt — versions 1.8.4
- Ubuntu Python-Apt — versions 0.8.0, 0.8.1, 0.8.3
Weakness classification (CWE)
References
- usn.ubuntu.com/4247-1/ (vendor-advisory, Patch, Third Party Advisory)
- usn.ubuntu.com/4247-3/ (vendor-advisory, Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-15796?
- CVE-2019-15796 is a medium-severity vulnerability in Canonical Python-Apt, classified under Improper Authentication. CVSS score: 4.7/10. Published 2020-03-26.
- How severe is CVE-2019-15796?
- Medium severity. CVSS v3 base score is 4.7 out of 10.