Horizon Alert
Summary of the vulnerability and why it matters
This advisory addresses a critical vulnerability in the NR RRC component that could allow for a denial-of-service condition due to improper message handling before authentication. While this component is part of the cellular signaling stack and not directly internet-facing, understanding its potential impact is important for confirming relevance and exposure within our environment.
- Improper message handling can disrupt service.
- Understand cellular signaling stack risks.
- Confirm relevance and exposure.
Attack Path
How an attacker could exploit the issue
An attacker could target the cellular network's NR RRC component by sending specially crafted messages. Because this component handles communications before a device is fully authenticated, it lacks robust checks. This could lead to a denial-of-service condition where the network becomes unavailable.
- Network access required.
- Unauthenticated messages trigger failure.
- Denial-of-service risk.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability could affect the availability of network services when the NR RRC component improperly handles messages prior to user authentication, leading to a denial-of-service condition. This occurs because an unauthenticated attacker could send malformed messages that trigger a data abort.
- Network service availability.
- Malformed messages before authentication.
- Denial-of-service condition.
Operational Fix
Recommended remediation, mitigation, and detection steps
This critical vulnerability impacts the NR RRC component, likely managed by telecommunications infrastructure and network teams. The first practical step is to identify all instances of this component within your environment, confirm its exposure to attack vectors, and ascertain its business criticality to prioritize remediation efforts with the accountable owner.
- Network and infrastructure teams own this.
- Verify NR RRC component reachability.
- Plan remediation based on risk.
