Bug 2019726 (CVE-2020-25718) - CVE-2020-25718 samba: Samba AD DC did not correctly sandbox Kerberos tickets issues by an RODC
Summary: CVE-2020-25718 samba: Samba AD DC did not correctly sandbox Kerberos tickets ...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2020-25718
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2021718
Blocks: 1976705 2022412
TreeView+ depends on / blocked
 
Reported: 2021-11-03 09:00 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-11-11 15:11 UTC (History)
17 users (show)

Fixed In Version: samba 4.15.2, samba 4.14.10, samba 4.13.14
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the way samba, as an Active Directory Domain Controller, is able to support an RODC (read-only domain controller). This would allow an RODC to print administrator tickets.
Clone Of:
Environment:
Last Closed: 2021-11-10 03:21:14 UTC


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Description Huzaifa S. Sidhpurwala 2021-11-03 09:00:10 UTC
As per upstream advisory:


Samba as an Active Directory Domain Controller is able to support an RODC, which is meant to have minimal privileges in a domain.

However, in accepting a ticket from a Samba or Windows RODC, Samba was not confirming that the RODC is authorized to print such a ticket, via the msDS-NeverRevealGroup and msDS-RevealOnDemandGroup (typically "Allowed RODC Replication Group" and "Denied RODC Replciation Group").

This would allow an RODC to print administrator tickets.

Comment 1 Huzaifa S. Sidhpurwala 2021-11-10 02:54:09 UTC
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 2021718]

Comment 2 Product Security DevOps Team 2021-11-10 03:21:12 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2020-25718


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