CVE-2011-1070 in v86d
Summary
by MITRE
v86d before 0.1.10 do not verify if received netlink messages are sent by the kernel. This could allow unprivileged users to manipulate the video mode and potentially other consequences.
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Analysis
by VulDB Data Team • 02/14/2024
The vulnerability identified as CVE-2011-1070 affects v86d versions prior to 0.1.10, representing a critical security flaw in the virtual 8086 mode daemon responsible for handling x86 virtualization in Linux systems. This daemon operates in a privileged context to manage video mode changes and other low-level hardware operations, making it a prime target for privilege escalation attacks. The core issue stems from insufficient validation mechanisms within the netlink communication protocol implementation, which is the primary method of inter-process communication between user-space applications and the kernel.
The technical flaw manifests in the daemon's failure to authenticate the origin of incoming netlink messages, specifically not verifying whether these communications originate from the kernel itself rather than potentially malicious user-space processes. This lack of kernel origin verification creates a fundamental security gap where unprivileged users can craft and send spoofed netlink messages that appear to come from the kernel. The vulnerability directly maps to CWE-284, which addresses insufficient access control mechanisms, and more specifically to CWE-352, concerning Cross-Site Request Forgery, as it involves unauthorized message manipulation. The attack vector leverages the daemon's trust relationship with kernel communications, bypassing normal access controls through message spoofing techniques.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and denial of service conditions. An unprivileged user could manipulate video mode settings through crafted netlink messages, potentially causing display corruption, system instability, or even complete system lockups. The broader consequences include the possibility of escalating privileges to root level, allowing attackers to execute arbitrary code with full system privileges. This vulnerability affects systems using v86d for virtualization purposes, particularly those running legacy x86 applications in virtualized environments, making it relevant to both desktop and server deployments where virtualization is implemented.
Mitigation strategies for CVE-2011-1070 primarily focus on upgrading to v86d version 0.1.10 or later, which includes proper kernel origin verification mechanisms. System administrators should also implement network segmentation and access controls to limit exposure of vulnerable systems, particularly in environments where v86d is actively used. The remediation aligns with ATT&CK technique T1068, which involves exploiting local privilege escalation vulnerabilities, and emphasizes the importance of maintaining up-to-date system components. Additional protective measures include monitoring for suspicious netlink message patterns and implementing proper system hardening practices that reduce the attack surface for such vulnerabilities. Organizations should also consider implementing kernel module signing and runtime integrity checks to prevent unauthorized modifications to the virtualization infrastructure.