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120 lines
4.5 KiB
Markdown
120 lines
4.5 KiB
Markdown
---
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title: SONY VAIO
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layout: default
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created: 2008-07-20 15:44:48 +0200
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updated: 2008-07-20 17:34:22 +0200
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toc: false
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tags:
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- know-how
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- hacking
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- hardware
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- bios
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- passwords
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- sony
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- vaio
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---
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In the newer SONY VAIO Notebooks, the BIOS password is no longer stored in the volatile CMOS-area but on an EEPROM.
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Jean Delvare has published [his results](http://khali.linux-fr.org/vaio/eeprom.html) of an analysis of various Sony
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Vaio EEPROM dumps on [his homepage](http://www.ensicaen.ismra.fr/~delvare/). There you can see that the BIOS password
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is stored encrypted in the first 7 Bytes of the EEPROM and, if no password is set, these Bytes are 00h. So if you
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delete the whole chip - like you can do with DELL notebooks - you should get rid of the password.
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Unfortunately, this would delete all other informations like e.g. serial number, model name, etc., so that specific
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Sony-Applications might cause trouble or even don't accept the notebook as a SONY-device.
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If you are still able to boot up the notebook, but only can't get into the BIOS setup, you can approach the password
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the following way:
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* download and extract the DOS-version of [HWiNFO](http://www.hwinfo.com)
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* copy the program GETSMBUS.EXE from HWiNFO to a FAT(32)-partition on the target computer or on a floppy.
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* boot up a DOS-based operating system, e.g. from a Win98/WinME-Installation-CD.
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* run the program GETSMBUS.EXE.
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The file `SMBUS57.DAT` created by GETSMBUS.EXE contains a complete dump of the EEPROM at address 0x57 - in 99% the SONY
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VAIO chip. The EEPROM can be read easily through the so-called SMBus. Usually the SMBus is used to query e.g. the
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RAM-modules for Vendor and Speed-Infos (they have a similar EEPROM). Also temperatures and fan-speeds can be read
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through the SMBus.
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Now you have the encrypted password and only have to decrypt it.
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Alternatively, you can desolder the EEPROM (likely of Type 93C46) and read it with an EEPROM-Programmer. Or just
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overwrite the first 7 Bytes with 00h. But it seems as if the EEPROM is built onto the bottom side of the mainboard and
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therefore it's hard to reach.
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Decrypt the password
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====================
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If you take a look onto the encrypted Bytes with a Hex-Editor, you'll soon notice that each Byte is an even number. So
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just divide by 2 and take a look at the character with this ASCII-code.
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<script type="text/javascript">
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document.write('<p>I wrote a small JavaScript to demonstrate it. After entering the 7 Bytes with the encrypted password, it calculates the password in cleartext.</p>');
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document.write('<p><form name="sony">Enter 7 Bytes as Hex: <input type="text" name="vaio" maxlength=20 size=20 value="a8 ca e6 e8 00 00 00" /><input type="button" value="Calculate password" onClick="ShowPwd();" /></form></p>');
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function ShowPwd() {
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var xBytes = document.sony.vaio.value.toLowerCase();
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var xHexset = new String('0123456789abcdef');
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var xPwd = '';
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var xVal = 0;
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for (var i=0;i<=6;i++) {
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xCA1 = xBytes.charAt(i*3);
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xCA2 = xBytes.charAt(i*3+1);
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xVal1 = xHexset.indexOf(xCA1);
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xVal2 = xHexset.indexOf(xCA2);
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xVal = (xVal1*16 + xVal2) / 2;
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if (xVal>0) { xPwd += String.fromCharCode(xVal); } else { break; }
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}
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alert('The BIOS-password is: "'+xPwd+'"');
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}
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</script>
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I also wrote a small Program which is able to parse the file `SMBUS57.DAT` or even query the SMBus directly. From the
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obtained data it shows informations about the SONY Vaio-notebook - even the password(s). Here is a screen-shot:
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**Download here:** [Sony VAIO Analyzer]({{ site.url }}/assets/sony_vaio_analyzer.zip)
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Interior views
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==============
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PCG-Z1XEP
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---------
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This is an interior view of a SONY VAIO Z1:
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(The DIP-switches below the keyboard are probably for setting the used TFT-panel. You can not delete the password with
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them anyway!)
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PCG-V505
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--------
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This is a naked SONY VAIO V505:
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[Back to overview.]({% post_url 2009-10-30-bios-passwords %})
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*[EEPROM]: Electrically Erasable Programmable Read-Only Memory
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*[DIP]: Dual In-Line Package
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*[BIOS]: Basic Input/Output System
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*[CMOS]: Complementary Metal-Oxide-Semiconductor
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*[SMBus]: System Management Bus
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*[ASCII]: American Standard Code for Information Interchange
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*[DOS]: Disk Operating System
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*[VAIO]: Visual Audio Intelligent Organizer, formerly: Video Audio Integrated Operation
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*[CD]: Compact Disc
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*[FAT]: File Allocation Table
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*[RAM]: Random Access Memory
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*[TFT]: Thin Film Transistor
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