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                         AUSCERT Security Bulletin

                               ASB-2011.0005
 A vulnerability has been identifed in sudo versions 1.7.0 through 1.7.4p4
                              14 January 2011

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

Product:              sudo 1.7.0 through 1.7.4p4
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Increased Privileges -- Existing Account
Resolution:           Patch/Upgrade
CVE Names:            CVE-2011-0010  
Member content until: Sunday, February 13 2011

OVERVIEW

        A vulnerability has been identifed in sudo versions 1.7.0 through 
        1.7.4p4.


IMPACT

        The vendor has provided the following details regarding this
        vulnerability which has been assigned CVE-2011-0010:
        
        "Beginning with sudo version 1.7.0 it has been possible to grant 
        permission to run a command using a specified group via sudo's -g 
        option (run as group), if allowed by the sudoers file. A flaw exists 
        in sudo's password checking logic that allows a user to run a command 
        with only the group changed without being prompted for a 
        password." [1] 
        
        "Exploitation of the flaw requires that sudo be configured with 
        sudoers entries that contain a Runas group. Entries that do not 
        contain a Runas group, or only contain a Runas user are not
        affected." [1]


MITIGATION

        The vendor recommends upgrading to the latest version of sudo to
        correct this vulnerability. [1]


REFERENCES

        [1] Flaw in Runas Group password checking
            http://www.sudo.ws/sudo/alerts/runas_group_pw.html

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.

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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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