Not So Random

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3. Use captured initial password reset tokens and Untwister to obtain PRNG seed Not So Random
PHP mt_rand()- Exploitation Theory Target PRNG Obtain internal state from known output Output Use 644748169 Known Password Reset Token 604629952 Known Password Reset Token 1542177737 Known Password Reset Token 920134305 Known Password Reset Token ???????????????????? Target Password Reset Token Not So Random
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Not So Random Exploiting Unsafe Ran
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Talk Overview 1. Theory: • Why?
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Why do we need random numbers? •
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Random numbers in Web Applications
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Concept of Randomness • define: r
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PRNG PRNG r = random.Random() Not S
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PRNG 16768642083820545282 323536147
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PRNG PRNG 16768642083820545282 3235
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PRNG Seeds, States and Periods 1. S
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PRNG Seeds and States Seed (/dev/ur
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Page 27 and 28: PRNG Seeds and States Seed (/dev/ur
Page 29 and 30: PRNG Seeds and States Seed (/dev/ur
Page 31 and 32: CSPRNG vs PRNG 1. Non-Deterministic
Page 33 and 34: Language Examples Language Method P
Page 35 and 36: Internals Glance public Random(int
Page 37 and 38: Exploitation Theory • Want to obt
Page 39 and 40: Exploitation Theory Target PRNG Out
Page 41 and 42: Exploitation Theory Target PRNG Out
Page 43 and 44: Exploitation Theory Target PRNG Obt
Page 45 and 46: Exploitation Theory Our PRNG Obtain
Page 47 and 48: Untwister Brute Force Algorithm 101
Page 65 and 66: Demos 1. Brute Force • PHP mt_ran
Page 67 and 68: Overview - Brute Force 1. Generate
Page 73 and 74: Brute Force - Source class ResetPas
Page 75 and 76: PHP mt_rand()- Exploitation • Rec
Page 77: PHP mt_rand()- Exploitation • Tar
Page 81 and 82: PHP mt_rand() - Untwister uint32_t
Page 83 and 84: PHP mt_rand()- Exploitation root@ka
Page 85 and 86: PHP mt_rand()- Exploitation class R
Page 87 and 88: 5. Generate a number of tokens usin
Page 89 and 90: 6. Attempt tokens against applicati
Page 91 and 92: PHP mt_rand()- Exploitation “To r
Page 93 and 94: Demos 1. Brute Force • PHP mt_ran
Page 95 and 96: Overview - Brute Force Bounded Call
Page 101 and 102: Brute Force Bounded Call - Source c
Page 103 and 104: PHP mt_rand(0,61)- Exploitation •
Page 105 and 106: PHP mt_rand(0,61)- Exploitation •
Page 107 and 108: Exploitation Theory Target PRNG Obt
Page 109 and 110: PHP mt_rand(0,61)- Decoder #!/usr/b
Page 111 and 112: PHP mt_rand(0,61)- Exploitation # p
Page 113 and 114: PHP Bounded mt_rand() Constructor
Page 115 and 116: PHP Bounded mt_rand() - Patched Unt
Page 117 and 118: PHP mt_rand(0,61)- Exploitation roo
Page 119 and 120: 4. Seed new PRNG with obtained seed
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Page 123 and 124: PHP mt_rand(0,61)- Exploitation # p
Page 125 and 126: PHP mt_rand(0,61)- Exploitation Not
Page 127 and 128: Exploitation Theory Our PRNG Obtain
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Overview - Weak Seeds 1. Generate a
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Weak Seeds - Source public class Re
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.NET System.Random() Constructor
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.NET System.Random()- Exploitation
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Exploitation Theory Observed PRNG O
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System.Random() Constructor • .NE
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System.Random() Untwister Patch int
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5. Attempt tokens against applicati
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Exploitation Theory Observed PRNG O
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Practical Exploitation - Tips • L
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Mitigations Need a truly random num
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Developers, Developers, Developers
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Links / Further Reading • https:/
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Not So Random

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