Privilege escalation in Samba Cifs-Utils
CVE-2021-20208
A flaw was found in cifs-utils in versions before 6.13. A user when mounting a krb5 CIFS file system from within a container can use Kerberos credentials of the host. The highest threat from this vulnerability is to data confidentiality and integrity.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N.
EPSS exploit prediction
EPSS: 0.007 (49.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.000
Affected products
- Samba Cifs-Utils
- Fedoraproject Fedora — versions 33, 34, 35
- Red Hat Enterprise Linux — versions 7.0, 8.0
- Cifs-Utils — versions cifs-utils 6.13
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- bugzilla.samba.org/show_bug.cgi (Patch, Issue Tracking, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
Frequently asked questions
- What is CVE-2021-20208?
- CVE-2021-20208 is a medium-severity vulnerability in Samba Cifs-Utils, classified under Incorrect Privilege Assignment. CVSS score: 6.1/10. Published 2021-04-19.
- How severe is CVE-2021-20208?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2021-20208 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.