CVE-2023-23583: Intel Core i3-10100Y Escalation Flaw

CVE-2023-23583 Overview

CVE-2023-23583 is a processor-level vulnerability affecting a wide range of Intel processors where specific sequences of instructions can trigger unexpected behavior. This hardware vulnerability allows an authenticated local user to potentially achieve privilege escalation, information disclosure, or denial of service conditions. The vulnerability affects Intel Core processors from the 10th and 11th generations, as well as various Intel Xeon processor families commonly deployed in enterprise server and embedded environments.

Critical Impact

A local attacker with valid authentication can exploit this processor-level vulnerability to escalate privileges, access sensitive information, or crash affected systems, impacting both consumer and enterprise Intel-based infrastructure.

Affected Products

• Intel Core i3/i5/i7/i9 10th Generation processors (Ice Lake, Comet Lake)
• Intel Core i3/i5/i7/i9 11th Generation processors (Tiger Lake, Rocket Lake)
• Intel Xeon D-Series processors (D-1500, D-1600, D-1700, D-2100, D-2700 families)
• Intel Xeon Scalable processors (Gold 5300/6300, Platinum 8300/8350 series)
• Intel Xeon Silver 4300 Series processors
• Debian Linux 11.0 and 12.0
• NetApp FAS2820, AFF A900, and FAS9500 storage systems

Discovery Timeline

• November 14, 2023 - CVE-2023-23583 published to NVD
• January 7, 2025 - Last updated in NVD database

Technical Details for CVE-2023-23583

Vulnerability Analysis

This vulnerability stems from improper handling of specific instruction sequences within affected Intel processors. When certain combinations of processor instructions are executed, the CPU exhibits unexpected behavior that deviates from its intended operation. This unexpected behavior can be leveraged by a local attacker who already has authenticated access to the system to manipulate processor state in unintended ways.

The vulnerability requires local access and prior authentication, meaning an attacker must already have some level of access to the target system. However, once this prerequisite is met, the vulnerability can be exploited to bypass security boundaries, potentially elevating privileges from a standard user context to a higher-privileged level. The flaw is classified under CWE-1281 (Sequence of Processor Instructions Leads to Unexpected Behavior) and CWE-276 (Incorrect Default Permissions), indicating fundamental issues in how the processor handles instruction execution.

Root Cause

The root cause lies within the microarchitectural design of affected Intel processors. When specific sequences of instructions are processed, the CPU fails to properly validate or handle the resulting state transitions. This creates a window where the processor's internal state becomes inconsistent or manipulable. The flaw exists in the silicon itself, requiring microcode updates to properly address the instruction handling behavior. This is a classic example of a hardware-level vulnerability that cannot be fixed through software alone without the corresponding microcode patches from Intel.

Attack Vector

Exploitation requires local access with authenticated user privileges. An attacker would need to execute specially crafted code on the target system that triggers the vulnerable instruction sequences. The attack does not require elevated privileges to initiate, but can result in privilege escalation if successfully exploited. The local nature of the attack vector means that remote exploitation is not directly possible—an attacker would first need to gain some form of local access through other means such as malware, social engineering, or leveraging another vulnerability.

The exploitation process involves crafting specific instruction sequences that trigger the unexpected processor behavior. Once triggered, the attacker can potentially manipulate memory contents, access protected information, or cause system instability. In virtualized environments, this vulnerability could potentially impact the hypervisor isolation boundaries.

Detection Methods for CVE-2023-23583

Indicators of Compromise

• Unexpected system crashes or reboots that correlate with specific application execution patterns
• Anomalous processor exception events logged in system event logs
• Unusual privilege escalation events without corresponding legitimate administrative actions
• Memory access violations in kernel logs that cannot be attributed to known software issues

Detection Strategies

• Monitor system logs for Machine Check Exception (MCE) events that may indicate exploitation attempts
• Implement host-based intrusion detection systems (HIDS) to detect unusual instruction execution patterns
• Deploy endpoint detection and response (EDR) solutions capable of monitoring low-level system behavior
• Audit user account activities for unexpected privilege elevation events

Monitoring Recommendations

• Enable and review kernel audit logs for suspicious process behavior and privilege changes
• Configure SentinelOne agents to monitor for exploitation indicators associated with hardware vulnerabilities
• Implement baseline monitoring of processor performance counters for anomaly detection
• Establish alerts for unexpected system reboots or crashes in production environments

How to Mitigate CVE-2023-23583

Immediate Actions Required

• Review Intel's official security advisory Intel-SA-00950 for the complete list of affected processor SKUs
• Inventory all systems with affected Intel processors across the enterprise
• Prioritize patching for systems in high-security environments or those processing sensitive data
• Ensure BIOS/UEFI firmware updates are included in the patch deployment schedule

Patch Information

Intel has released microcode updates to address this vulnerability. The remediation process involves applying both operating system-level microcode packages and BIOS/UEFI firmware updates from system vendors. For Debian-based systems, security advisories DSA-5563 and related LTS announcements provide updated intel-microcode packages. NetApp has issued advisory NTAP-20231116-0015 for affected storage systems. Organizations should coordinate with their hardware vendors to obtain appropriate firmware updates for their specific systems.

Workarounds

• Apply operating system microcode updates through package managers (e.g., intel-microcode package on Debian/Ubuntu)
• Update system BIOS/UEFI firmware to versions containing the corrected microcode
• Implement strict access controls to limit local user access on critical systems
• Consider hardware refresh cycles for systems in highly sensitive environments where residual risk is unacceptable

# Debian/Ubuntu microcode update
sudo apt update
sudo apt install intel-microcode

# Verify microcode version after update
dmesg | grep microcode

# Check current CPU microcode revision
cat /proc/cpuinfo | grep microcode