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                         AUSCERT Security Bulletin

                               ASB-2014.0032
        A number of vulnerabilities have been identified in Samba.
                               19 March 2014

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Samba
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Access Confidential Data -- Remote/Unauthenticated
                      Unauthorised Access      -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2013-6442 CVE-2013-4496 
Member content until: Friday, April 18 2014

OVERVIEW

        A number of vulnerabilities have been identified in Samba prior to 
        3.6.23, 4.0.16, and 4.1.6. [1, 2]


IMPACT

        The vendor has provided the following details regarding these
        vulnerabilities:
        
        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 
        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.
        
        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 
        2014)." [1]
        
        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 
        unprotected." [2]


MITIGATION

        The vendor recommends updating Samba to correct these issues. [1, 2]


REFERENCES

        [1] Subject: CVE-2013-4496: Password lockout not enforced for SAMR
            password changes
            http://www.samba.org/samba/security/CVE-2013-4496

        [2] Subject: smbcacls will remove the ACL on a file or directory when
            changing owner or group owner.
            http://www.samba.org/samba/security/CVE-2013-6442

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
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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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