Vulnerability in Opensmtpd
CVE-2020-8793
OpenSMTPD before 6.6.4 allows local users to read arbitrary files (e.g., on some Linux distributions) because of a combination of an untrusted search path in makemap.c and race conditions in the offline functionality in smtpd.c.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Opensmtpd
- Canonical Ubuntu Linux — versions 18.04, 19.10
- Fedoraproject Fedora — versions 32
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openbsd.org/security.html (Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/02/24/4 (mailing-list, Exploit, Mailing List, Third Party Advisory)
- seclists.org/fulldisclosure/2020/Feb/28 (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- usn.ubuntu.com/4294-1/ (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-8793?
- CVE-2020-8793 is a medium-severity vulnerability in Opensmtpd, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.7/10. Published 2020-02-25.
- How severe is CVE-2020-8793?
- Medium severity. CVSS v3 base score is 4.7 out of 10.
- Is CVE-2020-8793 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.