Bug 1072792 (CVE-2013-4496)

Summary: CVE-2013-4496 samba: Password lockout not enforced for SAMR password changes
Product: [Other] Security Response Reporter: Huzaifa S. Sidhpurwala <huzaifas>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: aavati, asn, gdeschner, jkurik, nlevinki, pfrields, rwheeler, sbose, security-response-team, ssaha, vbellur
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-01-26 22:27:39 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1072804, 1073352, 1073353, 1073356, 1073357, 1073905, 1073913, 1075429    
Bug Blocks: 1044102    

Description Huzaifa S. Sidhpurwala 2014-03-05 08:56:36 UTC 
From upstream samba advisory:

Samba versions 3.4.0 and above allow the administrator to implement locking out Samba accounts after a number of bad password attempts. 

However, all released versions of Samba did not implement this check for password changes, such as are available over multiple SAMR and RAP interfaces, allowing password guessing attacks. 

Most sites do not configure the bad password lockout feature.  Typically it is only enabled when Samba is configured as a Domain Controller, so most file server deployments are not impacted. 

This flaw only affects samba when deployed as a Primary Domain Controller.

Upstream bug:
https://bugzilla.samba.org/show_bug.cgi?id=10245
Comment 7 Huzaifa S. Sidhpurwala 2014-03-12 06:11:29 UTC 
Public via:

http://www.samba.org/samba/security/CVE-2013-4496
Comment 8 Huzaifa S. Sidhpurwala 2014-03-12 06:13:42 UTC 
Created samba tracking bugs for this issue:

Affects: fedora-all [bug 1075429]
Comment 9 Fedora Update System 2014-03-15 15:15:29 UTC 
samba-4.1.6-1.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 10 Huzaifa S. Sidhpurwala 2014-03-24 04:53:21 UTC 
Acknowledgements:

Red Hat would like to thank the Samba project for reporting this issue.
Upstream acknowledges Andrew Bartlett as the original reporter.
Comment 11 errata-xmlrpc 2014-03-25 14:09:59 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5
  Red Hat Enterprise Linux 6

Via RHSA-2014:0330 https://rhn.redhat.com/errata/RHSA-2014-0330.html
Comment 12 Fedora Update System 2014-03-28 03:18:32 UTC 
samba-4.0.16-1.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 13 errata-xmlrpc 2014-04-09 17:43:40 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:0383 https://rhn.redhat.com/errata/RHSA-2014-0383.html