CVE-2022-0336
Some of these checks are able to be bypassed if an account modification re-adds an SPN that was previously present on that account, such as one added when a computer is joined to a domain.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.63%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The Samba AD DC includes checks when adding service principals names (SPNs) to an account to ensure that SPNs do not alias with those already in the database. Some of these checks are able to be bypassed if an account modification re-adds an SPN that was previously present on that account, such as one added when a computer is joined to a domain. An attacker who has the ability to write to an account can exploit this to perform a denial-of-service attack by adding an SPN that matches an existing service. Additionally, an attacker who can intercept traffic can impersonate existing services, resulting in a loss of confidentiality and integrity.
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.63% probability · 75th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-276
- Affected
- samba/samba · fedoraproject/fedora
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2022-0336Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2046134Issue Tracking, Third Party Advisory
- https://bugzilla.samba.org/show_bug.cgi?id=14950Issue Tracking, Patch, Vendor Advisory
- https://github.com/samba-team/samba/commit/1a5dc817c0c9379bbaab14c676681b42b0039a3cPatch, Third Party Advisory
- https://github.com/samba-team/samba/commit/c58ede44f382bd0125f761f0479c8d48156be400Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202309-06
- https://www.samba.org/samba/security/CVE-2022-0336.htmlVendor Advisory
- https://access.redhat.com/security/cve/CVE-2022-0336Issue Tracking, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2046134Issue Tracking, Third Party Advisory
- https://bugzilla.samba.org/show_bug.cgi?id=14950Issue Tracking, Patch, Vendor Advisory
- https://github.com/samba-team/samba/commit/1a5dc817c0c9379bbaab14c676681b42b0039a3cPatch, Third Party Advisory
- https://github.com/samba-team/samba/commit/c58ede44f382bd0125f761f0479c8d48156be400Patch, Third Party Advisory
- https://security.gentoo.org/glsa/202309-06
- https://www.samba.org/samba/security/CVE-2022-0336.htmlVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.