Bug 1647246 (CVE-2018-16853)

Summary: CVE-2018-16853 samba: S4U2Self crash with MIT KDC build
Product: [Other] Security Response Reporter: Sam Fowler <sfowler>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: abhgupta, abokovoy, anoopcs, asn, bmcclain, dbaker, dblechte, dfediuck, eedri, gdeschner, jokerman, jrivera, jstephen, lmohanty, madam, mgoldboi, michal.skrivanek, rhs-smb, sankarshan, sbonazzo, sbose, security-response-team, sherold, sisharma, smohan, ssaha, ssorce, sthangav, trankin, vbellur
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: samba 4.7.12, samba 4.8.7, samba 4.9.3 Doc Type: If docs needed, set a value
Doc Text:
Samba versions 4.7 and later, built with MIT Kerberos support, are vulnerable to a crash via the S4U2self extension. A user in a Samba Active Directory domain can crash the KDC when Samba is built in the non-default MIT Kerberos configuration.
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-11-28 07:36:08 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1654093    
Bug Blocks: Embargoed1647248    

Description Sam Fowler 2018-11-07 00:10:03 UTC
Samba versions 4.7 and later built with MIT Kerberos support are vulnerable to a crash via the S4U2self extension.

Upstream Bug:


Comment 2 Sam Fowler 2018-11-28 03:01:47 UTC
External Reference:


Comment 3 Sam Fowler 2018-11-28 03:02:10 UTC

Name: The Samba Team
Upstream: Isaac Boukris

Comment 4 Sam Fowler 2018-11-28 03:02:37 UTC
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1654093]

Comment 5 Huzaifa S. Sidhpurwala 2018-11-28 07:36:27 UTC

This flaw does not affect the version of samba shipped with Red Hat Enterprise Linux because there is no support for samba as Active Directory Domain Controller.