CVE-2022-30127: Microsoft Edge Privilege Escalation Flaw

CVE-2022-30127 Overview

CVE-2022-30127 is an Elevation of Privilege vulnerability affecting Microsoft Edge (Chromium-based). This race condition vulnerability (CWE-362) allows attackers to potentially escalate privileges through network-based attacks that require user interaction. The vulnerability stems from improper synchronization within the browser's execution flow, enabling attackers to exploit timing windows to gain elevated access beyond their intended authorization level.

Critical Impact

Successful exploitation could allow an attacker to execute code with elevated privileges, potentially compromising the confidentiality, integrity, and availability of the affected system. The vulnerability can affect resources beyond the vulnerable component's scope.

Affected Products

• Microsoft Edge (Chromium-based)

Discovery Timeline

• 2022-06-01 - CVE-2022-30127 published to NVD
• 2025-01-02 - Last updated in NVD database

Technical Details for CVE-2022-30127

Vulnerability Analysis

This elevation of privilege vulnerability is classified under CWE-362 (Race Condition), indicating that the flaw occurs when multiple processes or threads access shared resources without proper synchronization. In the context of Microsoft Edge Chromium, this race condition creates a window of opportunity where an attacker can manipulate the execution flow to gain privileges they should not possess.

The attack requires network access and user interaction, meaning a victim must actively engage with malicious content (such as visiting a crafted webpage) for the exploit to succeed. Additionally, the attack complexity is high, indicating that specific conditions must be met for successful exploitation. When exploited, the vulnerability has the potential to impact resources beyond the immediate scope of the vulnerable component, which is characteristic of browser-based privilege escalation attacks.

Root Cause

The vulnerability is rooted in a race condition (CWE-362) within Microsoft Edge's Chromium-based architecture. Race conditions occur when the correct operation of a system depends on the sequence or timing of uncontrollable events. In this case, improper handling of concurrent operations creates a Time-of-Check Time-of-Use (TOCTOU) scenario where an attacker can manipulate program state between security checks and subsequent actions.

Attack Vector

The attack vector is network-based, requiring an attacker to convince a user to interact with malicious content. A typical attack scenario involves:

1. An attacker crafts a malicious webpage designed to trigger the race condition
2. The victim navigates to or is redirected to the malicious page
3. The attacker's code exploits the timing window in Edge's privilege handling
4. If successful, the attacker gains elevated privileges on the system

The high attack complexity means precise timing is required, and exploitation is not guaranteed on every attempt. However, once successful, the impact is significant with potential for full compromise of confidentiality, integrity, and availability.

The vulnerability mechanism involves exploiting timing inconsistencies in how Microsoft Edge handles privileged operations. Race conditions in browser contexts typically involve concurrent access to shared resources such as DOM objects, memory allocations, or security context checks. For detailed technical information, refer to the Microsoft Security Advisory.

Detection Methods for CVE-2022-30127

Indicators of Compromise

• Unusual Microsoft Edge process behavior, including unexpected child processes spawning with elevated privileges
• Anomalous network connections originating from Edge processes attempting to access privileged system resources
• Browser crash logs indicating race condition failures or memory corruption patterns
• Unexpected privilege escalation events correlated with Microsoft Edge usage

Detection Strategies

• Monitor for suspicious process creation chains where msedge.exe spawns processes with elevated integrity levels
• Implement behavioral detection rules for abnormal browser memory access patterns indicative of race condition exploitation
• Deploy endpoint detection for privilege escalation attempts originating from browser sandbox escape scenarios
• Configure SIEM rules to correlate browser crash events with subsequent privilege changes

Monitoring Recommendations

• Enable detailed logging for Microsoft Edge process activity and privilege level changes
• Monitor Windows Event Logs for Security ID changes and token manipulation associated with browser processes
• Implement network traffic analysis to detect exploitation attempts through malicious webpage delivery
• Deploy SentinelOne agents with real-time behavioral monitoring to detect privilege escalation patterns

How to Mitigate CVE-2022-30127

Immediate Actions Required

• Update Microsoft Edge to the latest patched version immediately
• Verify automatic updates are enabled for Microsoft Edge in enterprise environments
• Implement web filtering to block access to known malicious domains that may attempt exploitation
• Consider enabling Enhanced Security Mode in Microsoft Edge for additional protection

Patch Information

Microsoft has released security updates addressing this vulnerability. Administrators should apply the latest Microsoft Edge updates through:

• Windows Update: Automatic delivery for systems configured for Microsoft Edge updates
• Microsoft Edge Update Channel: Enterprise deployments can leverage update policies
• Manual Download: Available through the Microsoft Update Guide

Gentoo Linux users should refer to GLSA 202208-25 for distribution-specific patching guidance.

Workarounds

• Restrict access to untrusted websites until patching is complete
• Enable browser isolation technologies to contain potential exploitation attempts
• Configure Microsoft Edge to run in more restrictive modes where available
• Implement network segmentation to limit the impact of potential privilege escalation

# Verify Microsoft Edge version (should be patched version)
# Windows PowerShell
Get-AppxPackage -Name Microsoft.MicrosoftEdge.Stable | Select-Object Version

# Force Microsoft Edge update check
Start-Process "msedge://settings/help"