CVE-2021-35232: SolarWinds Web Help Desk SQLi Flaw

CVE-2021-35232 Overview

CVE-2021-35232 is a hardcoded credentials vulnerability discovered in the SolarWinds Web Help Desk product. This security flaw allows an attacker with local access to the Web Help Desk host machine to leverage embedded credentials to execute arbitrary HQL (Hibernate Query Language) queries against the database. Through this attack vector, malicious actors can steal password hashes of users or insert arbitrary data into the database, potentially compromising the entire help desk system and its user base.

Critical Impact

Attackers with local access can extract user password hashes and manipulate database contents through hardcoded credentials, potentially leading to credential theft and data integrity compromise.

Affected Products

• SolarWinds Web Help Desk (all versions prior to 12.7.7 Hotfix 1)

Discovery Timeline

• 2021-12-27 - CVE-2021-35232 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2021-35232

Vulnerability Analysis

This vulnerability falls under CWE-798 (Use of Hard-coded Credentials), a critical security weakness where authentication credentials are embedded directly in the application source code or configuration files. The hardcoded credentials in SolarWinds Web Help Desk provide unauthorized database access to anyone who can gain local access to the host machine.

The vulnerability enables attackers to bypass normal authentication mechanisms and directly interact with the underlying database through HQL queries. This creates two primary attack scenarios: data exfiltration (stealing password hashes) and data manipulation (inserting malicious records into the database).

Root Cause

The root cause of CVE-2021-35232 is the implementation of hardcoded credentials within the SolarWinds Web Help Desk application. These credentials were embedded in the application code or configuration, providing a static pathway to database access that cannot be easily changed by administrators. This practice violates secure development principles that mandate dynamic credential management and proper secrets handling.

Attack Vector

The attack vector requires local access to the Web Help Desk host machine. Once an attacker gains local access—whether through physical access, compromised SSH/RDP credentials, or another vulnerability—they can locate and utilize the hardcoded credentials to connect directly to the database backend.

From there, the attacker can craft HQL queries to:

• Enumerate and extract user account information including password hashes
• Modify existing database records to escalate privileges or alter configurations
• Insert new records to create backdoor accounts or manipulate help desk tickets

The vulnerability does not require any user interaction and can be exploited with low privileges on the local system.

Detection Methods for CVE-2021-35232

Indicators of Compromise

• Unexpected database connections originating from the Web Help Desk host machine using non-standard database access methods
• Unusual HQL query patterns in database logs, particularly queries targeting user credential tables
• Evidence of bulk data extraction from user-related database tables
• New or modified database records that cannot be attributed to legitimate Web Help Desk operations

Detection Strategies

• Monitor database audit logs for direct connections bypassing the Web Help Desk application layer
• Implement file integrity monitoring on Web Help Desk configuration files and application binaries
• Review authentication logs for anomalous local access patterns to the Web Help Desk server
• Deploy endpoint detection solutions to identify credential harvesting activities on the host

Monitoring Recommendations

• Enable comprehensive database logging including all query executions and connection attempts
• Configure alerts for any direct database access that does not originate from expected application service accounts
• Implement network segmentation monitoring to detect lateral movement attempts following credential theft
• Regularly audit user account tables for unexpected modifications or new entries

How to Mitigate CVE-2021-35232

Immediate Actions Required

• Apply SolarWinds Web Help Desk 12.7.7 Hotfix 1 immediately to remediate the hardcoded credentials vulnerability
• Audit all user accounts and force password resets if unauthorized database access is suspected
• Review database logs for any evidence of exploitation prior to patching
• Restrict local access to the Web Help Desk host machine to essential personnel only

Patch Information

SolarWinds has released Web Help Desk 12.7.7 Hotfix 1 to address this vulnerability. The patch removes or properly secures the hardcoded credentials, eliminating the attack vector. Organizations should update to this version or later as soon as possible.

For detailed patch information and installation instructions, refer to the SolarWinds Web Help Desk Hotfix Release Notes and the SolarWinds Security Advisory for CVE-2021-35232.

Workarounds

• Implement strict access controls limiting local access to the Web Help Desk host machine
• Deploy network segmentation to isolate the Web Help Desk infrastructure from general network access
• Enable enhanced database auditing to detect any unauthorized access attempts
• Consider implementing additional authentication layers for database access as an interim measure

# Example: Restrict local access permissions (Linux)
# Limit SSH access to Web Help Desk server to specific admin users
# /etc/ssh/sshd_config
AllowUsers webhelpdeskadmin@trusted-ip
DenyUsers *

# Restart SSH service after configuration
systemctl restart sshd