Password retrieval. Mag. iur. Dr. techn. Michael Sonntag
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1 Mag. iur. Dr. techn. Michael Sonntag Password retrieval Institute for Information Processing and Microprocessor Technology (FIM) Johannes Kepler University Linz, Austria Michael Sonntag 2011
2 Source files shadow1, shadow2, shadow3» Linux password files passwords.txt» A file with passwords extracted from Windows Requirements: Administrative rights» For installing software Installed software (see CD) Software: John the Ripper Ophcrack Source data Michael Sonntag Password retrieval 2
3 Please note! We are not going to attack anyone here! We are trying to indentify problems for later fixing it Permission is always required for trying to break passwords Which system(s) (source of encrypted files/passwords) At what time What passwords Michael Sonntag Password retrieval 3
4 John the Ripper Password cracking tool Uses word lists as well as brute-force» Word lists can be "multiplied" by mangling rules (reverse, ) Note: Long lists take longer, but provide better chances!» Brute force: Define character set and set password length limit Can also be used as password-strength checking module "Reconstructs" the password from its hash» Therefore requires access to the password file! Can be interrupted and restarted (may take a long time!) Supported are the following password hash types crypt(3) hash types: traditional & double-length DES-based, BSDI extended DES-based, FreeBSD MD5-based (also used on Linux, Cisco IOS), OpenBSD Blowfish-based (also used on some Linux distr.), Kerberos/AFS, Windows NT/2000/XP LM DES-based» More with additional patches! Michael Sonntag Password retrieval 5
5 John the Ripper Your tasks: Run John the Ripper against the provided shadow files» "Scenarios/shadow1": Try wordlist» "Scenarios/shadow2": Try wordlist Try incremental (=brute force) search, profile "alpha"» "Scenarios/shadow3": Try in your spare time! Press space to get statistics Interpret the results/success probabilities Note: Several other programs for windows exist too, but these do not recover the password, they merely reset it You can get access to the computer, but the password itself remains secret! Michael Sonntag Password retrieval 6
6 Expected result: John the Ripper shadow1: The password is in the wordlist: "network» john-386 shadow1 Will be found very fast shadow2: The password is not in the wordlist» john-386 shadow2 Will not be found at all!» john-386 i=alpha shadow2 ; and modify john.ini (MinLen=4, MaxLen=4) before Try the brute-force search: Takes considerably longer» But also finds such words! shadow3: Has a very complex and long password It is not in the word list It cannot be found by brute force» Unless you have extremely powerful hardware and much time!» Note: John the Ripper does not support parallelization! Other such tools do (10 characters MIGHT be possible!) Michael Sonntag Password retrieval 7
7 Cain & Abel Password cracking tool for Windows Has lots of other functions as well, e.g.» Unmasking password entry boxes (pre-filled old passwords!)» Network sniffer» Base64 decoder Supports a large number of different passwords Contains a program for creating rainbow tables Your task: Install and start Cain&Abel Decrypt the VNC server password as stored in the registry extract Scenarios/VNC.reg» This is trivial once you have found how/where to enter it!» Give an estimate on the quality of this password based on How/where it is stored How long cracking it takes Michael Sonntag Password retrieval 8
8 Ophcrack Password cracking tool for Windows LAN Manager/NT LAN Manager hashes (i.e. Win passwords)» LM / NTLM hashes (not stored in cleartext, but as hash only)» Windows Vista has the (easier) LM hashes disabled by default Older versions still store the weak LM for backwards compatibility Can import the hashes from various formats or read it directly Based on Rainbow tables and brute force Some are freely available, others cost money» You could theoretically create them yourself, but this is an extremely time- and resource-intensive activity! Free tables: About 99.9 % coverage for alphanumeric passwords of up to 14 characters (LM), 99% for NTLM» All printable chars/symbols/space (NT/Vista); German á US$ 99 Michael Sonntag Password retrieval 9
9 Reducing time by investing memory "Pre-computed passwords" Rainbow tables Simplest form: Generate all passwords + their hashes and store them for later lookup (immediate cracking!) Drawback: Gigantic table! Rainbow tables: Compute all passwords, but store only a small part of them After finding the hash, some time is required to obtain the actual password Time is reduced by the square of the available memory Countermeasure: Use "salting" A random value is generated, prepended to the password, and stored Rainbow table would have to be enlarged for the salt» 4 char salt + 14 char password 18 char rainbow table! Plus: Salt is typically binary, so instead of 70 4! Michael Sonntag Password retrieval 10 Philippe Oechslin: Ophcrack
10 Ophcrack Your tasks: Run Ophcrack against the provided passwords» File: Scenarios/Passwords.txt Discuss the results:» Why are some found quickly, but the same password takes much longer in another instance?» Why is this working in Windows, but not for other systems? Michael Sonntag Password retrieval 11
11 Expected result: Ophcrack JDoe: Can be found very fast with the XP free tables JDoe2: Can be found with the Vista free tables JDoe3: Cannot be found with the XP free tables» These work only for LM hashes; this account only has NTLM! Cannot be found with the Vista free tables» This seems to be one of the "missing" passwords!» Based on a dictionary with variations; Success rate 99% Better: Commercial; 8GB instead of 461 MB Note: The second account takes much longer NTLM hashes are much stronger than the NT hashes As both are the same word, once the NT hash is known, only the capitalization must be tried out! Michael Sonntag Password retrieval 12
12 Expected result: Ophcrack Windows password hashes have several problems LM are effectively 2 passwords of 7 characters LM passwords are converted to uppercase» NTLM doesn t do this: Upper- and lowercase are important! LM and NTLM do not employ any "salting"» This is why rainbow tables are feasible here! How to disable at least the especially weak LM hashes:» Attention: Will not allow connecting from Windows ME/98/ computers any more!» Disabled by default from Windows Vista onwards Set the registry key HKLM\SYSTEM\CurrentControlSet\Lsa\NoLMHash to 1 Michael Sonntag Password retrieval 13
13 ??? Questions? Thank you for your attention!??? Michael Sonntag 2011
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