Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability has been identified in Apache CXF, an open-source services framework, that impacts the handling of authorization codes. Specifically, a flaw in the `removeCodeGrant` functionality allows a captured authorization code to be reused an unlimited number of times, contrary to security standards. This issue could have implications for systems using Apache CXF for authentication and authorization, particularly those exposed externally.
- Authorization codes can be reused indefinitely.
- Affects systems handling authorization and authentication.
- Confirm relevance and check for exposure.
Attack Path
How an attacker could exploit the issue
An attacker could potentially exploit this vulnerability by intercepting or obtaining a valid authorization code. This code, meant to be used only once to grant access, can be repeatedly redeemed due to a flaw in how the system manages these codes. Successful exploitation could allow an attacker to gain unauthorized and repeated access to resources or perform actions as if they were a legitimate user.
- No authentication required for attack.
- Repeatedly redeem authorization codes.
- Unauthorized access and repeated actions.
Live Threat
Current exploitation, exposure, and threat context
A flaw in how authorization codes are managed could allow them to be reused indefinitely. This bypasses a critical security measure designed to ensure each code is used only once, potentially impacting the integrity of authorization processes.
- Authorization codes.
- Replayed authorization codes.
- Unauthorized access.
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability in Apache CXF's `DefaultEncryptingCodeDataProvider` impacts systems handling OAuth authorization codes, potentially allowing unlimited redemptions. Platform or application teams responsible for CXF deployments should prioritize identifying all instances of this technology, assessing their exposure, and confirming business criticality. Coordination with vendor management may be necessary if support contracts are in place, followed by a risk-based remediation plan.
- Platform or application teams should own the issue.
- Verify CXF instances and their exposure.
- Plan remediation based on business risk.
