Horizon Alert
Summary of the vulnerability and why it matters
This vulnerability affects various versions of Microsoft Windows operating systems. The flaw exists due to the way Windows improperly handles specific system calls, potentially allowing unauthorized access. The main business impact stems from the ability for an attacker to gain elevated privileges on an affected system.
- Vulnerable Microsoft Windows systems
- Improper handling of system calls
- Unauthorized privilege escalation
Attack Path
How an attacker could exploit the issue
This vulnerability allows an attacker to gain elevated privileges on a targeted system. An attacker with local access to a vulnerable system can exploit a weakness in how Windows handles Advanced Local Procedure Call (ALPC). This can lead to the attacker executing code with elevated permissions, potentially impacting system integrity and data confidentiality. The attack is then used to achieve elevated control.
- Local system access required.
- Attacker triggers ALPC call.
- Results in elevated control.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows for an elevation of privilege when Windows improperly handles Advanced Local Procedure Call (ALPC) interactions. Attackers with existing, low-privilege access to a targeted system could potentially exploit this to gain higher-level permissions. The potential impact involves unauthorized access and modification of system data and operations. Given its inclusion in the Known Exploited Vulnerabilities catalog, organizations should treat this as a high-priority issue requiring prompt attention.
- Low skill level attackers can exploit.
- Requires existing local access.
- High business risk; urgent action needed.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
An elevation of privilege vulnerability has been identified in Windows, stemming from improper handling of Advanced Local Procedure Call (ALPC) operations. This issue affects multiple versions of Windows operating systems and Windows Server. Exploiting this vulnerability could allow an attacker with local access to gain elevated privileges on an affected system.
- Find affected assets.
- Reduce exposure or isolate risk.
- Fix, verify, and monitor.
