Auth bypass in Samba
CVE-2020-25719
A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name-based authentication. The Samba AD DC, could become confused about the user a ticket represents if it did not strictly require a Kerberos PAC and always use the SIDs found within. The result could include total domain compromise.
Vulnerability class: Broken Authentication
EPSS: 0.017 (74.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Samba
- Canonical Ubuntu_linux — versions 20.04, 21.04, 21.10
- Debian Debian_linux — versions 9.0, 10.0
- Fedoraproject Fedora — versions 33, 34, 35
- Redhat Enterprise_linux — versions 7.0, 8.0
- Redhat Enterprise_linux_desktop — versions 7.0
- Redhat Enterprise_linux_eus — versions 8.2, 8.4
- Redhat Enterprise_linux_for_ibm_z_systems — versions 7.0, 8.0
- Redhat Enterprise_linux_for_ibm_z_systems_eus — versions 8.2, 8.4
- Redhat Enterprise_linux_for_power_big_endian — versions 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Patch, Third Party Advisory, Issue Tracking)
- secalert@redhat.com (Mitigation, Vendor Advisory)
- secalert@redhat.com (vendor-advisory)
Frequently asked questions
- What is CVE-2020-25719?
- CVE-2020-25719 is a high-severity vulnerability in Samba, classified under Improper Authentication. CVSS score: 7.2/10. Published 2022-02-18.
- How severe is CVE-2020-25719?
- High severity. CVSS v3 base score is 7.2 out of 10.
- Is CVE-2020-25719 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.