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AUSCERT Security Bulletin
A number of vulnerabilities have been identified in Samba.
19 March 2014
AusCERT Security Bulletin Summary
Operating System: UNIX variants (UNIX, Linux, OSX)
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2013-6442 CVE-2013-4496
Member content until: Friday, April 18 2014
A number of vulnerabilities have been identified in Samba prior to
3.6.23, 4.0.16, and 4.1.6. [1, 2]
The vendor has provided the following details regarding these
CVE-2013-4496: "Samba versions 3.4.0 and above allow the administrator
to implement locking out Samba accounts after a number of bad password
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.
As this was found during an internal audit of the Samba code there are
no currently known exploits for this problem (as of March 11th
CVE-2013-6442: "Samba versions 4.0.0 and above have a flaw in the
smbcacls command. If smbcacls is used with the "-C|--chown name" or
"-G|--chgrp name" command options it will remove the existing ACL on
the object being modified, leaving the file or directory
The vendor recommends updating Samba to correct these issues. [1, 2]
 Subject: CVE-2013-4496: Password lockout not enforced for SAMR
 Subject: smbcacls will remove the ACL on a file or directory when
changing owner or group owner.
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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