Bug 2013080 (CVE-2021-3671) - CVE-2021-3671 samba: Null pointer dereference on missing sname in TGS-REQ
Summary: CVE-2021-3671 samba: Null pointer dereference on missing sname in TGS-REQ
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2021-3671
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: 2013081
Blocks: 1988195 2013082
TreeView+ depends on / blocked
 
Reported: 2021-10-12 04:04 UTC by Huzaifa S. Sidhpurwala
Modified: 2021-10-12 08:08 UTC (History)
15 users (show)

Fixed In Version: samba 4.13.12, samba 4.14.8
Doc Type: If docs needed, set a value
Doc Text:
A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.
Clone Of:
Environment:
Last Closed: 2021-10-12 08:03:29 UTC


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Description Huzaifa S. Sidhpurwala 2021-10-12 04:04:58 UTC
Samba's use of Heimdal was vulnerable to a null pointer de-reference flaw due to missing sname in TGS-REQ. 

This is already fixed in upstream Heimdal via:
https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a

Comment 1 Huzaifa S. Sidhpurwala 2021-10-12 04:05:51 UTC
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 2013081]


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