CVE-2025-1828
📋 TL;DR
The Crypt::Random Perl package versions 1.05 through 1.55 may use the non-cryptographically secure rand() function for cryptographic operations when proper entropy sources are unavailable. This allows attackers to potentially predict or manipulate random values used in security-sensitive contexts like key generation, session tokens, or cryptographic operations. All systems using vulnerable versions of Crypt::Random on Windows (by default) or other platforms without /dev/urandom or EGD are affected.
💻 Affected Systems
- Crypt::Random Perl module
📦 What is this software?
Crypt\ by Timlegge
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of cryptographic security leading to predictable encryption keys, session hijacking, authentication bypass, or data decryption by attackers who can predict the weak random values.
Likely Case
Degraded cryptographic security where attackers with sufficient resources could potentially predict or influence random values over time, compromising specific security functions that rely on Crypt::Random.
If Mitigated
Minimal impact if proper entropy sources are configured and available, or if the application doesn't use Crypt::Random for security-critical operations.
🎯 Exploit Status
Exploitation requires understanding of the application's use of Crypt::Random and ability to predict or influence the weak random number generation. No public exploit code is known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.56 or later
Vendor Advisory: https://github.com/perl-Crypt-OpenPGP/Crypt-Random/commit/1f8b29e9e89d8d083fd025152e76ec918136cc05
Restart Required: No
Instructions:
1. Update Crypt::Random to version 1.56 or later using CPAN: 'cpan Crypt::Random'
2. Alternatively, manually install from GitHub: clone repository and run 'perl Makefile.PL; make; make install'
3. Verify installation with 'perl -MCrypt::Random -e 'print $Crypt::Random::VERSION'
🔧 Temporary Workarounds
Explicitly specify secure Provider
allForce Crypt::Random to use a cryptographically secure random source by explicitly setting the Provider parameter in code.
use Crypt::Random qw( makerandom );
my $random = makerandom( Provider => 'Win32' ); # For Windows
my $random = makerandom( Provider => 'dev/urandom' ); # For Unix-like
🧯 If You Can't Patch
- Discontinue use of Crypt::Random for security-critical operations and replace with alternative cryptographically secure random number generators like Crypt::Random::Secure or Math::Random::Secure.
- Ensure proper entropy sources (/dev/urandom on Unix-like systems, CryptGenRandom API on Windows) are available and configured for the system.
🔍 How to Verify
Check if Vulnerable:
Check installed Crypt::Random version: 'perl -MCrypt::Random -e "print \$Crypt::Random::VERSION"' - if output is between 1.05 and 1.55 inclusive, system is vulnerable.Check Version:
perl -MCrypt::Random -e 'print $Crypt::Random::VERSION'Verify Fix Applied:
After update, run version check command again - should show 1.56 or higher. Test random generation in a security context to ensure proper entropy sources are being used.📡 Detection & Monitoring
Log Indicators:
- Application errors related to random number generation failures
- Warnings about unavailable entropy sources in application logs
- Cryptographic operation failures or anomalies
Network Indicators:
- None specific to this vulnerability - exploitation would manifest as successful cryptographic attacks
SIEM Query:
Search for application logs containing 'Crypt::Random' errors or warnings about random number generation, particularly on Windows systems or systems without /dev/urandom.