CVE-2022-28693: Intel Processors Information Disclosure

CVE-2022-28693 Overview

CVE-2022-28693 is a Side Channel Attack vulnerability affecting certain Intel Processors. The vulnerability exists in the unprotected alternative channel of return branch target prediction, which may allow an authorized user with local access to potentially enable information disclosure. This vulnerability is categorized under CWE-420 (Unprotected Alternate Channel).

Critical Impact

Local attackers with authorized access to affected Intel processors may exploit speculative execution mechanisms to leak sensitive information through side-channel attacks targeting return branch prediction.

Affected Products

• Intel(R) Processors (specific models detailed in Intel Security Advisory SA-00707)

Discovery Timeline

• 2025-02-14 - CVE CVE-2022-28693 published to NVD
• 2025-02-14 - Last updated in NVD database

Technical Details for CVE-2022-28693

Vulnerability Analysis

This vulnerability affects the speculative execution behavior in certain Intel processors, specifically targeting the return branch target prediction mechanism. The flaw exists in an unprotected alternative channel that can be exploited through local access to leak sensitive information from the processor's speculative execution state.

The attack requires local access and an authorized user context, which limits the attack surface compared to remote exploitation scenarios. However, the vulnerability can result in high confidentiality impact as attackers may extract sensitive data from memory regions that should be protected. The attack complexity is considered high, requiring specific conditions and technical expertise to successfully exploit.

Root Cause

The root cause of CVE-2022-28693 lies in the implementation of return branch target prediction within affected Intel processors. The alternative prediction channel lacks adequate protection mechanisms, allowing local attackers to observe speculative execution artifacts that can reveal confidential information. This is a hardware-level vulnerability in the processor's microarchitecture related to speculative execution optimizations.

Attack Vector

The attack vector for CVE-2022-28693 requires local access to the affected system. An authorized user must have the ability to execute code on the target system to exploit this vulnerability. The attacker can then manipulate or observe the return branch prediction behavior to leak information through timing side channels or other speculative execution artifacts.

The exploitation technique involves:

1. Gaining local access to a system with an affected Intel processor
2. Executing specially crafted code that interacts with the return branch prediction mechanism
3. Measuring timing differences or other observable side effects to infer protected data
4. Reconstructing sensitive information from the leaked speculative execution state

For detailed technical information regarding this vulnerability, refer to the Intel Security Advisory SA-00707.

Detection Methods for CVE-2022-28693

Indicators of Compromise

• Unusual CPU-intensive processes attempting to perform timing measurements or access specific memory patterns
• Applications executing code patterns consistent with speculative execution side-channel exploitation
• Unexpected system calls or memory access patterns from authorized user processes

Detection Strategies

• Monitor for processes exhibiting behavior consistent with side-channel attacks, such as precise timing measurements or cache probing
• Implement endpoint detection solutions capable of identifying speculative execution attack patterns
• Deploy behavioral analysis tools to detect anomalous memory access patterns on affected Intel systems
• Utilize hardware performance counters to identify suspicious branch prediction activity

Monitoring Recommendations

• Enable audit logging for process execution and monitor for suspicious local activity
• Deploy SentinelOne Singularity Platform for advanced behavioral detection of side-channel attack techniques
• Monitor system performance metrics for abnormal CPU utilization patterns that may indicate exploitation attempts
• Implement kernel-level monitoring for unusual memory access patterns

How to Mitigate CVE-2022-28693

Immediate Actions Required

• Review the Intel Security Advisory SA-00707 for affected processor models and recommended mitigations
• Apply available microcode updates and firmware patches from Intel and system vendors
• Implement software-based mitigations recommended by Intel for affected systems
• Assess the risk exposure of systems with affected Intel processors in your environment

Patch Information

Intel has provided guidance and mitigations through Security Advisory SA-00707. Organizations should:

1. Consult the Intel Security Advisory SA-00707 for the complete list of affected processors
2. Apply microcode updates through BIOS/UEFI firmware updates from system manufacturers
3. Deploy operating system patches that implement recommended software mitigations
4. Consider enabling available hardware and software mitigations as specified in the advisory

Workarounds

• Restrict local access to affected systems to only trusted and necessary users
• Implement strict access controls and principle of least privilege for systems with affected processors
• Consider workload isolation strategies to separate sensitive operations from untrusted code execution
• Deploy additional monitoring and detection capabilities on systems that cannot be immediately patched

# Check Intel processor microcode version on Linux systems
cat /proc/cpuinfo | grep -E "microcode|model name"

# Verify mitigation status for speculative execution vulnerabilities
cat /sys/devices/system/cpu/vulnerabilities/*