CVE-2021-27258 in Orion Platform
Summary
by MITRE • 04/15/2021
This vulnerability allows remote attackers to execute escalate privileges on affected installations of SolarWinds Orion Platform 2020.2. Authentication is not required to exploit this vulnerability. The specific flaw exists within the SaveUserSetting endpoint. The issue results from improper restriction of this endpoint to unprivileged users. An attacker can leverage this vulnerability to escalate privileges their privileges from Guest to Administrator. Was ZDI-CAN-11903.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/21/2021
The CVE-2021-27258 vulnerability represents a critical privilege escalation flaw within the SolarWinds Orion Platform version 2020.2, demonstrating a fundamental breakdown in access control mechanisms that enables unauthenticated remote exploitation. This vulnerability resides within the SaveUserSetting endpoint, which serves as a critical interface for user configuration management within the platform's web application. The flaw stems from inadequate authorization checks that fail to properly validate user privileges before allowing access to administrative functions, creating a pathway for attackers to bypass normal security controls without requiring any form of authentication credentials.
The technical implementation of this vulnerability exploits a classic authorization bypass pattern where the SaveUserSetting endpoint lacks proper input validation and privilege verification mechanisms. When an attacker sends crafted requests to this endpoint, the system fails to verify whether the requesting user possesses sufficient privileges to modify administrative settings, effectively allowing any remote user to manipulate user configuration data. This misconfiguration creates a direct pathway for privilege escalation from the lowest user level to full administrative access, fundamentally undermining the platform's security model. The vulnerability's classification aligns with CWE-285, which addresses improper authorization issues in software systems, and represents a significant deviation from standard security practices where endpoint access controls should be strictly enforced regardless of the request source.
From an operational impact perspective, this vulnerability presents an extremely dangerous threat landscape for organizations utilizing the affected SolarWinds Orion Platform, as it eliminates the need for authentication credentials while providing complete administrative control. Attackers can exploit this flaw to gain full system access without detection, potentially leading to data exfiltration, system compromise, and unauthorized modification of critical infrastructure monitoring data. The remote nature of the exploitation means that attackers can target affected systems from anywhere on the internet, making this vulnerability particularly dangerous for organizations with exposed web interfaces. The privilege escalation from Guest to Administrator status provides attackers with unrestricted access to all platform features, including the ability to modify user accounts, access sensitive monitoring data, and potentially pivot to other systems within the network infrastructure.
Organizations affected by this vulnerability should implement immediate mitigations including network segmentation to isolate the affected platform, implementing strict firewall rules to restrict access to the SaveUserSetting endpoint, and deploying intrusion detection systems to monitor for suspicious activity patterns. The recommended approach aligns with ATT&CK technique T1078 which addresses valid accounts and legitimate credentials as a means of gaining access to systems. Additionally, organizations should conduct comprehensive security audits of their SolarWinds installations, apply the vendor-provided security patches immediately, and consider implementing multi-factor authentication controls even for administrative access. The vulnerability also highlights the importance of proper input validation and access control implementation, as outlined in security frameworks such as NIST SP 800-53 controls that emphasize the need for proper authentication and authorization mechanisms. Organizations should also consider implementing security monitoring solutions that can detect unauthorized privilege escalation attempts and establish incident response procedures specifically tailored to address such critical vulnerabilities in enterprise monitoring platforms.