Bug 1711816 (CVE-2019-12435) - CVE-2019-12435 samba: AD DC Denial of Service in DNS management server
Summary: CVE-2019-12435 samba: AD DC Denial of Service in DNS management server
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2019-12435
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: 1721872
Blocks: 1711838
TreeView+ depends on / blocked
 
Reported: 2019-05-20 07:54 UTC by Marian Rehak
Modified: 2021-02-16 21:56 UTC (History)
24 users (show)

Fixed In Version: samba 4.9.9, samba 4.10.5
Clone Of:
Environment:
Last Closed: 2019-06-19 08:06:07 UTC
Embargoed:

Attachments (Terms of Use)

Description Marian Rehak 2019-05-20 07:54:22 UTC 
As per upstream advisory:

The dnsserver RPC pipe provides administrative facilities to modify DNS records and zones which allows an authenticated user to crash the RPC server process via a NULL pointer de-reference. This issue affects Samba 4.0 and later.

There is no further vulnerability associated with this issue, merely a denial of service.
Comment 2 Huzaifa S. Sidhpurwala 2019-06-10 04:54:16 UTC 
Acknowledgments:

Name: The samba project
Comment 3 Huzaifa S. Sidhpurwala 2019-06-10 04:54:18 UTC 
Mitigation:

The dnsserver task can be stopped by setting 
 'dcerpc endpoint servers = -dnsserver'
in the smb.conf and restarting Samba.
Comment 4 Huzaifa S. Sidhpurwala 2019-06-10 06:40:28 UTC 
Upstream bug: https://bugzilla.samba.org/show_bug.cgi?id=13922
Comment 7 Huzaifa S. Sidhpurwala 2019-06-19 08:00:36 UTC 
External References:

https://www.samba.org/samba/security/CVE-2019-12435.html
Comment 8 Huzaifa S. Sidhpurwala 2019-06-19 08:01:16 UTC 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1721872]
Comment 9 Hardik Vyas 2019-06-19 08:09:57 UTC 
Statement:

This issue did not affect the version of samba as shipped with 'Red Hat Gluster Storage 3' as they did not include support for Active Directory Domain Controller.
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