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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.3951
                                  FreeBSD
                              25 October 2019

===========================================================================

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

Product:           sudo
Publisher:         FreeBSD
Operating System:  FreeBSD
Impact/Access:     Root Compromise -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-14287  

Reference:         ESB-2019.3901
                   ESB-2019.3839
                   ESB-2019.3826

Original Bulletin: 
   http://www.vuxml.org/freebsd/3a1474ba-f646-11e9-b0af-b888e347c638.html

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FreeBSD VuXML: Documenting security issues in FreeBSD and the FreeBSD Ports
Collection

sudo -- Potential bypass of Runas user restrictions

Affected packages
  sudo  < 1.8.28

Details

VuXML ID  3a1474ba-f646-11e9-b0af-b888e347c638
Discovery 2019-10-15
Entry     2019-10-24

Todd C. Miller reports:

    When sudo is configured to allow a user to run commands as an arbitrary
    user via the ALL keyword in a Runas specification, it is possible to run
    commands as root by specifying the user ID -1 or 4294967295.

    This can be used by a user with sufficient sudo privileges to run commands
    as root even if the Runas specification explicitly disallows root access as
    long as the ALL keyword is listed first in the Runas specification.

    Log entries for commands run this way will list the target user as
    4294967295 instead of root. In addition, PAM session modules will not be
    run for the command.

    [source]

References

CVE Name CVE-2019-14287
URL      https://www.sudo.ws/alerts/minus_1_uid.html

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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