Horizon Alert
Summary of the vulnerability and why it matters
A heap out-of-bounds write vulnerability exists within the Linux kernel's Netfilter subsystem, specifically in the x_tables.c file. This flaw allows an attacker with local access to escalate privileges or cause a denial of service by corrupting heap memory. The vulnerability can be triggered through user namespaces, potentially impacting containerized environments.
- Linux kernel's Netfilter component
- Out-of-bounds memory write
- Privilege escalation or denial of service
Attack Path
How an attacker could exploit the issue
This vulnerability in the Linux kernel's Netfilter component allows for a heap out-of-bounds write. An attacker with user namespace privileges can exploit this to corrupt heap memory. This corruption can lead to the attacker gaining elevated privileges on the affected system or causing a denial of service.
- Local attacker with user namespace access.
- Triggering heap memory corruption.
- Gaining privileges or causing denial of service.
Live Threat
Current exploitation, exposure, and threat context
A vulnerability exists in the Linux kernel's Netfilter component that allows for privilege escalation or denial of service. This issue is exploitable by an attacker with local access to a system. Successful exploitation could lead to unauthorized access and control over affected systems, potentially disrupting business operations.
- Likely attacker skill level: Moderate
- Required access or conditions: Local system access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability involves a heap out-of-bounds write within the Linux kernel's Netfilter component, potentially allowing local attackers to elevate privileges or cause denial of service through heap memory corruption. Organisations should identify systems running affected Linux kernel versions and Netapp products. Next, implement measures to reduce exposure or isolate potentially impacted systems. Finally, apply vendor-provided fixes, validate their successful implementation, and maintain continuous monitoring for related security incidents.
- Find affected assets.
- Reduce exposure or isolate risk.
- Fix, verify, and monitor.
