CVE-2022-2273 in Simple Membership Plugin
Summary
by MITRE • 08/01/2022
The Simple Membership WordPress plugin before 4.1.3 does not properly validate the membership_level parameter when editing a profile, allowing members to escalate to a higher membership level by using a crafted POST request.
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Analysis
by VulDB Data Team • 08/01/2022
The Simple Membership WordPress plugin vulnerability CVE-2022-2273 represents a critical access control flaw that enables unauthorized privilege escalation within WordPress environments. This vulnerability affects versions prior to 4.1.3 and stems from insufficient input validation mechanisms within the plugin's profile editing functionality. The flaw specifically targets the membership_level parameter, which is used to determine user permissions and access rights within the membership system. When administrators or users submit profile modification requests through the plugin's interface, the system fails to properly validate the membership_level parameter against the user's current privileges or the legitimate range of possible values.
The technical implementation of this vulnerability allows attackers to manipulate the membership_level parameter through crafted POST requests, bypassing the normal authorization checks that should prevent users from elevating their privileges. This type of vulnerability falls under the CWE-285 category of Improper Authorization, where the system fails to properly enforce access controls for privileged operations. The flaw exploits the principle of least privilege by enabling any authenticated user to submit requests that would normally require administrative authorization to modify membership tiers. Attackers can leverage this vulnerability to escalate their membership levels from standard user accounts to administrator or premium membership tiers, depending on the plugin's configuration and the available membership levels within the system.
The operational impact of this vulnerability extends beyond simple privilege escalation, creating potential pathways for data compromise and system infiltration. Once an attacker successfully elevates their membership level, they gain access to restricted content, administrative functions, and potentially sensitive user data that should remain protected. This vulnerability can be exploited through various attack vectors including cross-site request forgery attacks, where malicious actors craft specific requests that, when submitted by authenticated users, trigger the privilege escalation. The vulnerability also aligns with ATT&CK technique T1078.004 for Valid Accounts, as it allows attackers to leverage legitimate user accounts to achieve elevated privileges. Additionally, this represents a privilege escalation attack pattern that can be chained with other vulnerabilities to gain deeper system access.
Mitigation strategies for CVE-2022-2273 primarily focus on immediate plugin updates to version 4.1.3 or later, which incorporates proper input validation and authorization checks for membership level parameters. Organizations should implement comprehensive access control measures including role-based access control (RBAC) mechanisms, regular security audits of WordPress plugins, and monitoring for unauthorized privilege changes. Network-level protections such as web application firewalls (WAF) can provide additional defense-in-depth by detecting and blocking suspicious parameter manipulation attempts. Security professionals should also conduct regular vulnerability assessments to identify similar issues in other plugins and ensure that all WordPress installations maintain current security patches. The vulnerability highlights the importance of proper parameter validation and input sanitization practices as outlined in OWASP Top Ten and other security frameworks, emphasizing that all user-supplied data must be rigorously validated before being processed or stored within the system.