CVE-2024-5178: ServiceNow File Read Vulnerability

CVE-2024-5178 Overview

CVE-2024-5178 is a sensitive file read vulnerability affecting ServiceNow's Now Platform across multiple releases including Washington DC, Vancouver, and Utah. This vulnerability enables an administrative user to gain unauthorized access to sensitive files on the web application server. The issue stems from incomplete denylist handling (CWE-184), allowing attackers with administrative privileges to bypass security controls and read protected system files.

ServiceNow has addressed this vulnerability through security patches released during the June 2024 patching cycle. Organizations running affected versions should apply the relevant security patches as soon as possible to mitigate potential data exposure risks.

Critical Impact

Administrative users can exploit this vulnerability to read sensitive files from the web application server, potentially exposing configuration data, credentials, or other confidential information stored on the system.

Affected Products

• ServiceNow Washington DC Now Platform Release
• ServiceNow Vancouver Now Platform Release
• ServiceNow Utah Now Platform Release

Discovery Timeline

• 2024-07-10 - CVE-2024-5178 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2024-5178

Vulnerability Analysis

This vulnerability is classified under CWE-184 (Incomplete Denylist), indicating that the application's file access controls rely on a denylist approach that fails to account for all possible malicious inputs or file paths. When an administrative user interacts with the Now Platform, they can craft requests that bypass the incomplete denylist filtering mechanism to access files that should be restricted.

The network-based attack vector means exploitation can occur remotely, though the requirement for high privileges (administrative access) limits the potential attacker pool. The vulnerability primarily affects confidentiality, as successful exploitation results in unauthorized file disclosure without impacting system integrity or availability.

Root Cause

The root cause of CVE-2024-5178 lies in the incomplete implementation of file access controls within ServiceNow's Now Platform. The application employs a denylist-based approach to restrict access to sensitive files, but this denylist does not comprehensively cover all protected file paths or access patterns. This gap in the security controls allows administrative users to request files that should be protected, effectively bypassing the intended security restrictions.

Attack Vector

The attack leverages the network-accessible administrative interface of the ServiceNow Now Platform. An authenticated administrative user can exploit the incomplete denylist by crafting specific file access requests that are not properly filtered by the security controls.

The exploitation flow involves:

1. An attacker with valid administrative credentials authenticates to the ServiceNow instance
2. The attacker identifies file access functionality within the administrative interface
3. By manipulating file path parameters or request structures, the attacker crafts requests that bypass the incomplete denylist
4. The server processes these requests and returns the contents of sensitive files that should be protected

Due to the administrative privilege requirement, this vulnerability is most likely to be exploited in insider threat scenarios or following credential compromise of administrative accounts.

Detection Methods for CVE-2024-5178

Indicators of Compromise

• Unusual file access patterns from administrative accounts, particularly requests for system configuration files or credential stores
• Administrative session activity accessing file paths outside normal operational scope
• Audit log entries showing file read operations targeting sensitive directories on the web application server
• Anomalous API calls or HTTP requests attempting to retrieve protected file content

Detection Strategies

• Monitor ServiceNow administrative audit logs for unusual file access patterns or requests targeting sensitive file paths
• Implement file integrity monitoring on the ServiceNow web application server to detect unauthorized file reads
• Configure alerting for administrative accounts accessing files outside their typical operational scope
• Review HTTP request logs for path traversal patterns or attempts to access system configuration files

Monitoring Recommendations

• Enable comprehensive audit logging for all administrative actions within ServiceNow
• Deploy network traffic analysis to identify anomalous file access requests targeting the ServiceNow instance
• Establish baseline administrative activity patterns and alert on deviations
• Integrate ServiceNow logs with SIEM solutions for centralized monitoring and correlation

How to Mitigate CVE-2024-5178

Immediate Actions Required

• Apply the security patches released by ServiceNow during the June 2024 patching cycle immediately
• Review administrative account access and ensure principle of least privilege is enforced
• Audit recent administrative activity for signs of exploitation
• Implement additional access controls around sensitive file access functionality if possible

Patch Information

ServiceNow has released security patches addressing CVE-2024-5178 for all affected platform releases (Washington DC, Vancouver, and Utah). Detailed patch information and hot fixes are available through ServiceNow's official knowledge base articles:

• ServiceNow Knowledge Base Article KB1644293
• ServiceNow Knowledge Base Article KB1648312

Organizations should identify their current platform version and apply the corresponding security patches according to ServiceNow's guidance.

Workarounds

• Restrict administrative account access to only essential personnel until patches can be applied
• Implement additional network segmentation to limit access to ServiceNow administrative interfaces
• Enable enhanced logging and monitoring for administrative sessions to detect potential exploitation attempts
• Review and strengthen administrative authentication requirements, including multi-factor authentication enforcement