CVE-2024-30098: Windows 10 1507 Auth Bypass Vulnerability

CVE-2024-30098 Overview

CVE-2024-30098 is a security feature bypass vulnerability affecting Windows Cryptographic Services across multiple versions of Microsoft Windows desktop and server operating systems. This vulnerability allows an authenticated attacker to bypass cryptographic security controls through a network-based attack, potentially compromising the integrity and confidentiality of protected communications and data.

The vulnerability is classified under CWE-327 (Use of a Broken or Risky Cryptographic Algorithm), indicating that the Windows Cryptographic Services component implements or relies upon cryptographic mechanisms that can be circumvented by an attacker with low-level privileges.

Critical Impact

Successful exploitation could allow attackers to bypass cryptographic protections, potentially leading to unauthorized access to sensitive data, tampering with encrypted communications, or impersonation attacks against affected Windows systems.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2, 23H2)
• Microsoft Windows Server 2012 R2
• Microsoft Windows Server 2016
• Microsoft Windows Server 2019
• Microsoft Windows Server 2022
• Microsoft Windows Server 2022 23H2

Discovery Timeline

• July 9, 2024 - CVE-2024-30098 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-30098

Vulnerability Analysis

This security feature bypass vulnerability affects the Windows Cryptographic Services component, which is responsible for providing core cryptographic operations across the Windows operating system. The vulnerability allows an authenticated attacker with network access to bypass security features designed to protect cryptographic operations.

The attack requires authentication (low privileges) and while the attack complexity is considered high, successful exploitation does not require user interaction. This means that once an attacker has gained initial access to a network with authenticated credentials, they can potentially leverage this vulnerability to circumvent cryptographic protections without any action from legitimate users.

The impact of successful exploitation spans all three security pillars: confidentiality, integrity, and availability are all at risk. Attackers could potentially decrypt protected data, forge cryptographic signatures, or cause cryptographic operations to fail entirely.

Root Cause

The root cause of CVE-2024-30098 is related to the use of a broken or risky cryptographic algorithm (CWE-327) within Windows Cryptographic Services. This classification indicates that the affected component either:

• Implements a cryptographic algorithm with known weaknesses
• Uses cryptographic parameters or configurations that reduce security guarantees
• Contains logic flaws that allow cryptographic protections to be bypassed under specific conditions

The exact technical mechanism has not been publicly disclosed by Microsoft to prevent exploitation, but the CWE classification strongly suggests issues with cryptographic implementation or algorithm selection within the affected Windows services.

Attack Vector

The attack is network-based, meaning an attacker can exploit this vulnerability remotely without physical access to the target system. The attack requires:

1. Network Access: The attacker must be able to reach the target system over the network
2. Authentication: Low-level authenticated access is required (any valid user credentials)
3. High Complexity: The attack requires specific conditions or timing to succeed

An attacker with network access and valid credentials could target the Windows Cryptographic Services to bypass security features. This could be achieved through crafted network requests or by manipulating cryptographic operations in transit.

Due to the sensitive nature of this vulnerability and the lack of verified public exploit code, specific exploitation techniques are not detailed here. Organizations should consult the Microsoft Security Advisory for technical details and apply the appropriate security updates.

Detection Methods for CVE-2024-30098

Indicators of Compromise

• Unusual cryptographic operation failures or errors in Windows Event Logs
• Anomalous authentication patterns involving cryptographic services
• Unexpected certificate validation bypasses or cryptographic verification failures
• Network traffic patterns indicating attempts to manipulate cryptographic handshakes

Detection Strategies

• Monitor Windows Event Logs for cryptographic service errors, particularly events from the Microsoft-Windows-Crypto-NCrypt and Microsoft-Windows-CAPI2 providers
• Implement network monitoring to detect anomalous TLS/SSL handshake patterns
• Deploy SentinelOne Singularity Platform to detect behavioral anomalies associated with cryptographic service manipulation
• Audit authentication events for patterns that may indicate security feature bypass attempts

Monitoring Recommendations

• Enable verbose logging for Windows Cryptographic Services through Group Policy
• Implement centralized log collection and SIEM correlation for cryptographic events
• Configure alerts for unexpected cryptographic algorithm usage or downgrades
• Monitor for processes making unusual calls to cryptographic APIs

How to Mitigate CVE-2024-30098

Immediate Actions Required

• Apply the July 2024 security updates from Microsoft immediately to all affected Windows systems
• Prioritize patching for systems handling sensitive cryptographic operations or exposed to untrusted networks
• Review and audit systems for any signs of compromise before and after patching
• Implement network segmentation to limit exposure of critical systems

Patch Information

Microsoft has released security updates to address CVE-2024-30098 as part of the July 2024 Patch Tuesday release cycle. Organizations should apply the appropriate security updates for their Windows versions through Windows Update, WSUS, or Microsoft Update Catalog.

Detailed patch information and download links are available in the Microsoft Security Response Center Advisory for CVE-2024-30098.

Workarounds

• Restrict network access to affected systems using firewall rules to limit exposure
• Implement strong authentication mechanisms and enforce principle of least privilege to reduce the pool of authenticated attackers
• Monitor cryptographic operations for anomalies until patches can be applied
• Consider isolating critical systems that rely heavily on Windows Cryptographic Services

# Windows Firewall rule example to restrict access to affected systems
# Run in elevated PowerShell
New-NetFirewallRule -DisplayName "Restrict Untrusted Network Access" `
  -Direction Inbound -Action Block -RemoteAddress "0.0.0.0/0" `
  -LocalPort 445,135,139 -Protocol TCP `
  -Description "Temporary mitigation for CVE-2024-30098"

# Enable enhanced cryptographic logging
auditpol /set /subcategory:"System Integrity" /success:enable /failure:enable