CVE-2025-40905
📋 TL;DR
WWW::OAuth 1.000 and earlier for Perl uses non-cryptographically secure random number generation (rand()) for cryptographic operations, potentially allowing attackers to predict or manipulate OAuth tokens and signatures. This affects any Perl application using WWW::OAuth for OAuth 1.0 authentication. The vulnerability is present in default configurations.
💻 Affected Systems
- WWW::OAuth Perl module
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could forge valid OAuth signatures, impersonate legitimate users, bypass authentication entirely, or compromise OAuth-protected accounts and data.
Likely Case
Predictable OAuth tokens could allow session hijacking, unauthorized API access, or privilege escalation in affected applications.
If Mitigated
With proper network segmentation and monitoring, impact could be limited to specific OAuth-enabled services rather than full system compromise.
🎯 Exploit Status
Exploitation requires understanding of OAuth protocol and ability to predict or influence random number generation. No public exploits known as of reference date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: WWW::OAuth 1.001 or later
Vendor Advisory: https://security.metacpan.org/docs/guides/random-data-for-security.html
Restart Required: No
Instructions:
1. Update WWW::OAuth via CPAN: 'cpan WWW::OAuth'
2. Verify installation: 'perl -MWWW::OAuth -e "print $WWW::OAuth::VERSION"'
3. Ensure version is 1.001 or higher
4. No application restart needed for Perl modules
🔧 Temporary Workarounds
Use Crypt::Random::Secure
allOverride the insecure random generation by using Crypt::Random::Secure module for cryptographic operations
cpan Crypt::Random::Secure
Modify code to use Crypt::Random::Secure::irand() instead of rand()
🧯 If You Can't Patch
- Isolate affected applications behind additional authentication layers
- Implement strict rate limiting and monitoring on OAuth endpoints
🔍 How to Verify
Check if Vulnerable:
Check Perl module version: 'perl -MWWW::OAuth -e "print $WWW::OAuth::VERSION"' - if output is 1.000 or lower, vulnerableCheck Version:
perl -MWWW::OAuth -e "print $WWW::OAuth::VERSION"Verify Fix Applied:
After update, run same command and verify version is 1.001 or higher📡 Detection & Monitoring
Log Indicators:
- Unusual OAuth token patterns
- Multiple failed OAuth signature validations
- Unexpected OAuth authorization requests
Network Indicators:
- Abnormal OAuth callback traffic
- Repeated OAuth token generation attempts
SIEM Query:
source="*oauth*" AND (event="signature_failure" OR event="token_generation") | stats count by src_ip