Vulnerability in Canonical Ltd. Apport
CVE-2021-3899
There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (31.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Canonical Ltd. Apport — versions 0
- Canonical Apport
- Canonical Ubuntu Linux — versions 18.04, 20.04, 21.10
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376 (issue-tracking, Patch, Issue Tracking)
- ubuntu.com/security/notices/USN-5427-1 (vendor-advisory, Vendor Advisory)
- www.cve.org/CVERecord (issue-tracking, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3899?
- CVE-2021-3899 is a high-severity vulnerability in Canonical Ltd. Apport, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 7.8/10. Published 2024-06-03.
- How severe is CVE-2021-3899?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-3899 known to be exploited?
- 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.