CVE-2025-22376 – This vulnerability in Net::OAuth::Client for Pe... (How to Fix)

📋 TL;DR

This vulnerability in Net::OAuth::Client for Perl uses a weak random number generator (rand()) for nonce generation, making OAuth authentication predictable. Attackers could potentially replay OAuth requests or bypass authentication. Affects Perl applications using Net::OAuth::Client before version 0.29.

💻 Affected Systems

Products:

Net::OAuth Perl module

Versions: All versions before 0.29

Operating Systems: All operating systems running Perl

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects applications using Net::OAuth::Client with default nonce generation.

⚠️ 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.

Recommended Actions:

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

Authentication bypass leading to unauthorized access to OAuth-protected resources or account takeover.

🟠

Likely Case

OAuth request replay attacks allowing limited unauthorized actions within the OAuth flow.

🟢

If Mitigated

Minimal impact if proper OAuth server-side validation and short token lifetimes are implemented.

🌐 Internet-Facing: MEDIUM - OAuth endpoints are typically internet-facing, but exploitation requires specific conditions.

🏢 Internal Only: LOW - Internal OAuth flows are less exposed to external attackers.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires understanding of OAuth protocol and ability to predict or capture nonces.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 0.29

Vendor Advisory: https://metacpan.org/release/RRWO/Net-OAuth-0.29/changes

Restart Required: No

Instructions:

1. Update Net::OAuth using CPAN: 'cpan Net::OAuth'
2. Verify installation of version 0.29 or later
3. No application restart needed for Perl modules

🔧 Temporary Workarounds

Override nonce generation

all

Manually override the nonce generation method in your application to use cryptographically secure random values.

# In your Perl code, override the nonce method:
sub generate_nonce {
    use Crypt::URandom qw(urandom);
    return unpack('H*', urandom(16));
}

🧯 If You Can't Patch

Implement additional server-side validation of OAuth requests including timestamp checks
Reduce OAuth token lifetimes to minimize replay attack windows

🔍 How to Verify

Check if Vulnerable:

Check Net::OAuth version: 'perl -MNet::OAuth -e "print $Net::OAuth::VERSION\n"' - if version < 0.29, vulnerable.

Check Version:

perl -MNet::OAuth -e "print $Net::OAuth::VERSION\n"

Verify Fix Applied:

After update, run version check command and confirm version >= 0.29.

📡 Detection & Monitoring

Log Indicators:

Repeated OAuth authentication failures with similar nonce values
Unusual OAuth request patterns

Network Indicators:

Multiple OAuth requests with predictable nonce sequences

SIEM Query:

Search for OAuth authentication logs with nonce values showing low entropy patterns

📊 Metadata

CVE ID: CVE-2025-22376

CVSS v3 Score: 5.3 (MEDIUM)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CWE: CWE-338

EPSS Score: 0.11% exploit probability (28.6th percentile)

Published: January 3, 2025

Last Updated: January 21, 2025

🔗 References

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