Horizon Alert
Summary of the vulnerability and why it matters
A vulnerability has been identified in the Linux kernel's network filtering (netfilter) component. This flaw can be exploited by an attacker with local access to gain elevated privileges on a system. The core issue involves a specific function within the netfilter component that can lead to improper memory handling, potentially allowing unauthorized access and control.
- Vulnerable Linux kernel component
- Flaw in memory handling
- Unauthorized privilege escalation
Attack Path
How an attacker could exploit the issue
This vulnerability allows an attacker to escalate privileges on a system with local access. The exploitation involves a flaw in the Linux kernel's netfilter component, specifically within the `nft_verdict_init()` function. This flaw can lead to a double free condition when handling specific drop errors, ultimately enabling an attacker to gain elevated access.
- Local system access required.
- Attacker triggers code flaw.
- Attacker gains elevated control.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability allows for privilege escalation on a local system. An attacker with existing access could exploit this to gain higher permissions. The potential impact includes unauthorized access to sensitive data and modification of system configurations. Organizations should consider this a high-risk issue requiring prompt attention.
- Attackers with low skill.
- Requires local system access.
- High business risk and urgency.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
A use-after-free vulnerability in the Linux kernel's netfilter component has been identified, posing a risk of local privilege escalation. Exploitation could allow an attacker with local access to gain elevated permissions on affected systems. This situation warrants immediate attention to identify and mitigate the impact on the organization's systems and data.
- Identify Linux systems with the netfilter: nf_tables component.
- Reduce exposure by restricting local access.
- Apply vendor fix and validate remediation.
- Monitor for related security events.
