Vulnerability in Apport Project
CVE-2020-8831
Apport creates a world writable lock file with root ownership in the world writable /var/lock/apport directory. If the apport/ directory does not exist (this is not uncommon as /var/lock is a tmpfs), it will create the directory, otherwise it will simply continue execution using the existing directory. This allows for a symlink attack if an attacker were to create a symlink at /var/lock/apport, changing apport's lock file location. This file could then be used to escalate privileges, for example. Fixed in versions 2.20.1-0ubuntu2.23, 2.20.9-0ubuntu7.14, 2.20.11-0ubuntu8.8 and 2.20.11-0ubuntu22.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (50.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Apport Project
- Canonical Apport — versions 2.20.1, 2.20.9, 2.20.11
- Canonical Ubuntu Linux — versions 14.04, 16.04, 18.04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- launchpad.net/bugs/1862348 (Exploit, Third Party Advisory)
- usn.ubuntu.com/4315-1/ (Third Party Advisory)
- usn.ubuntu.com/4315-2/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-8831?
- CVE-2020-8831 is a medium-severity vulnerability in Apport Project, classified under Creation of Temporary File in Directory with Insecure Permissions. CVSS score: 6.5/10. Published 2020-04-22.
- How severe is CVE-2020-8831?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2020-8831 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.