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Firefox passwords management leaks

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Firefox passwords management leaks

Par infond
Le [2010-04-23] à 13:20:46



Présentation : This article deals with Firefox passwords management. These passwords are entered by the user during his web surfing, when he clicks on Where are they stored What is their format Is it possible to print the in user's session Can your administrator have access to them easily Firefox passwords are stored encrypted in a SQLite database in the user's directory. But, by default, the encryption key is hardcoded in plain text in Firefox source code, and Firefox offers the user a tool to print these passwords. Tools plugin Firefox SQLite manager https addons.mozilla.org fr firefox addon 5817 sources of Firefox ftp ftp.mozilla.org pub mozilla.org mozilla.org firefox releases latest source User print the passwords Printing saved passwords from user's session is trivial 1 . In Firefox Edit - Preferences - saved passwords - show passwords Administrator print user's password Passwords are stored in two files in directory home xxx .mozilla firefox xxx.default in Ubuntu, in directory Application Data of the user in Windows, signons.sqlite keys3.db After downloading them, put them in your own firefox directory. In order to complete that, administrator rights are needed on user's computer. Analysis of Firefox passwords management We'll now see that visited websites passwords are stored in a sqlite database. They are base64 encoded and encrypted with 3DES algorithm, using a key defined with Firefox main password. When this main password is not defined, a key, hard coded in the source, is used. copy signons.sqlite and keys3.db from directory home xxx .mozilla firefox xxx.default in Ubuntu, in directory Application Data in Windows , signons.sqlite keys3.db Start Firefox plugin sqlite manager Database - Connect Database - signons.sqlite How usernames and passwords are encrypted in Firefox Edit following file written in javascript toolkit components passwordmgr src storage-mozStorage.js The two encryption javascript functions are _encrypt PlainText ... PlainOctet _utfConverter.ConvertFromUnicode PlainText CipherText _decoderRing.encrytpString PlainOctet _decrypt CipherText ... PlainOctet _decoderRing.decryptString CipherText PlainText _udtConverter.ConvertToUnicode PlainOctet The function decryptString of service _decodeRing in in library nsddr.cpp 4 security manager ssl src nsSDR.cpp The function decryptString calls two other functions decode decrypt decode calls function PL_Base64Decode which decodes from base 64 to plain text cf Wikipedia 5 about base 64. Here is an online encoder decoder 6 decrypt calls three functions PK11_GetInternalKeySlot PK11_Authenticate PK11SDR_Decrypt These three functions use - the cryptographic API PKCS 11 defined by RSA 7 and 8 . - the cryptographic library Mozilla NSS 9 PK11SDR_Decrypt is defined in security nss lib pk11wrap pk11sdr.c To better understand how Firefox encrypts passwords of this databse, have a look first to the following function PK11SDR_encrypt It is in file security nss lib pk11wrap pk11sdr.c Here is an excerpt from its source 1. Locate the requested keyid, or the default key which has a keyid 2. Create an encryption context 3. Encrypt 4. Encode the results using ASN.1 slot PK11_GetInternalKeySlot Use triple-DES type CKM_DES3_CBC Login to the internal token before we look for the key, otherwise we won't find it. rv PK11_Authenticate slot, PR_TRUE, cx Find the key to use pKeyID keyid if pKeyID-len 0 pKeyID Use default value ctx PK11_CreateContextBySymKey type, CKA_ENCRYPT, key, params PK11_CipherOp ctx, sdrResult.data.data, int sdrResult.data.len, sdrResult.data.len, paddedData.data, paddedData.len PK11_ParamToAlgid SEC_OID_DES_EDE3_CBC, params, arena, SEC_ASN1EncodeItem 0, result, sdrResult, template You can see that - encryption algorithm is 3DES CBC, - encryption key is stored in an encryption context and is identified by a token, - if the main password in Firefox is not defined, passwords in the sqlite databas are still encrypted using a default key. What is the default key A bit earlier in the source code, keyIDItem is defined static unsigned char keyID 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01 static SECItem keyIDItem 0, keyID, sizeof keyID Then, recap Mozilla Firefox stores passwords entered during web surfing in the signons.sqlite database. They are first encrypted with 3DES, with a key derived from the master key of Firefox. If this one is not defined, a default key is used with string 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01. It is then encoded in base64 and stored in database. Administrator configure firefox to save the passwords without notifying the user This paragrpah is base on the article of Raymond 2 It is easy to modify Firefox code, so that it does not notify users about saving passwords When the user completes the form with the couple Id-password, Firefow calls java functions - _onFormSubmit in nsLoginManagerPrompter.js - promptToSavePassword in nsLoginManagerPrompter.js - _showSaveLoginNotification in nsLoginManagerPrompter.js - addLogin in nsLoginManager.js In Ubuntu, go to directory usr lib xulrunner-1.9.1.7 components in Windows Program Files Mozilla Firefox Components . Edit nsLoginManagerPrompter.js remark if you download Firefox sources, these functions are in toolkit components passwordmgr src Here is function _showSaveLoginNotification _showSaveLoginNotification Displays a notification bar rather than a popup , to allow the user to save the specified login. This allows the user to see the results of their login, and only save a login which they know worked. _showSaveLoginNotification function aNotifyBox, aLogin Ugh. We can't use the strings from the popup window, because they have the access key marked in the string eg Mo zilla , along with some weird rules for handling access keys that do not occur in the string, for L10N. See commonDialog.js's setLabelForNode . var neverButtonText this._getLocalizedString notifyBarNeverForSiteButtonText var neverButtonAccessKey this._getLocalizedString notifyBarNeverForSiteButtonAccessKey var rememberButtonText this._getLocalizedString notifyBarRememberButtonText var rememberButtonAccessKey this._getLocalizedString notifyBarRememberButtonAccessKey var notNowButtonText this._getLocalizedString notifyBarNotNowButtonText var notNowButtonAccessKey this._getLocalizedString notifyBarNotNowButtonAccessKey var brandShortName this._brandBundle.GetStringFromName brandShortName var displayHost this._getShortDisplayHost aLogin.hostname var notificationText if aLogin.username var displayUser this._sanitizeUsername aLogin.username notificationText this._getLocalizedString saveLoginText , brandShortName, displayUser, displayHost else notificationText this._getLocalizedString saveLoginTextNoUsername , brandShortName, displayHost The callbacks in buttons have a closure to access the variables in scope here set one to this._pwmgr so we can get back to pwmgr without a getService call. var pwmgr this._pwmgr var buttons Remember button label rememberButtonText, accessKey rememberButtonAccessKey, popup null, callback function aNotificationBar, aButton pwmgr.addLogin aLogin , Never for this site button label neverButtonText, accessKey neverButtonAccessKey, popup null, callback function aNotificationBar, aButton pwmgr.setLoginSavingEnabled aLogin.hostname, false , Not now button label notNowButtonText, accessKey notNowButtonAccessKey, popup null, callback function NOP this._showLoginNotification aNotifyBox, password-save , notificationText, buttons , replace with _showSaveLoginNotification function aNotifyBox, aLogin var pwmgr this._pwmgr pwmgr.addLogin aLogin , references 1 Où sont stockés les mots de passe Firefox - http www.memoclic.com 593-firefox 7155-firefox-securite-mots-de-passe-confidentiel.html 2 Raymond - Hacking Firefox to always auto save password without showing notification bar http www.raymond.cc blog archives 2009 11 05 hacking-firefox-to-always-auto-save-password-without-showing-notification-bar 3 Isamil Guneydas - How FF store your passwords Is it secure http realinfosec.com p 111 4 mikeblas - DecryptString - http www.hardforum.com archive index.php t-1050986.html 5 Wikipedia -Base64 - http en.wikipedia.org wiki Base64 6 antonin Foller - Motobit - http www.motobit.com util base64-decoder-encoder.asp 7 public key cryptographic standards - http fr.wikipedia.org wiki Public_Key_Cryptographic_Standards 8 master password personnal data encryption - http old.nabble.com Master-Password---personal-data-encryption-td24991602.html 9 bibliothèque cryptographique de Mozilla NSS - http www.mozilla.org projects security pki nss nss-guidelines.html 10 FZ blog - obtenir les credentials de Mozilla - http fz-corp.net p 199 deepen the subject 1 Brandon Cannaday - How Google chrome stores passwords - http www.switchonthecode.com tutorials how-google-chrome-stores-passwords

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