CVE-2023-4040 in Stripe Payment Plugin for WooCommerce Plugin
Summary
by MITRE • 08/18/2023
The Stripe Payment Plugin for WooCommerce plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the eh_callback_handler function in versions up to, and including, 3.7.9. This makes it possible for unauthenticated attackers to modify the order status of arbitrary WooCommerce orders.
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Analysis
by VulDB Data Team • 09/13/2023
The vulnerability identified in CVE-2023-4040 affects the Stripe Payment Plugin for WooCommerce, a widely used WordPress plugin that integrates Stripe payment processing capabilities with WooCommerce e-commerce functionality. This plugin serves as a critical component in the WordPress ecosystem, handling financial transactions for countless online stores worldwide. The flaw resides in the eh_callback_handler function, which is responsible for processing payment callbacks from Stripe servers. The vulnerability stems from the absence of proper capability validation within this function, creating a significant security gap that exposes e-commerce operations to potential exploitation. This represents a critical issue in web application security as it directly impacts the integrity of financial transactions and order processing within WordPress-based commerce platforms.
The technical implementation of this vulnerability involves a missing capability check that should verify whether the requesting user possesses appropriate authorization to modify order status information. In the affected versions up to and including 3.7.9, the eh_callback_handler function processes incoming payment notifications from Stripe without validating whether the request originates from an authenticated and authorized user. This oversight allows unauthenticated attackers to craft malicious requests that manipulate order status fields in the WooCommerce database. The flaw essentially creates an unrestricted data modification endpoint that bypasses WordPress's standard access control mechanisms. According to CWE-863, this represents a "Incorrect Authorization" vulnerability where the application fails to properly verify that an actor has sufficient privileges to perform a requested action, directly enabling privilege escalation and unauthorized data manipulation.
The operational impact of this vulnerability extends beyond simple data modification, creating potential financial risks and business disruption for affected e-commerce operations. Attackers can exploit this weakness to manipulate order status from pending to completed, potentially enabling them to process fraudulent refunds or manipulate inventory management systems. The vulnerability affects the core order management functionality of WooCommerce stores, which could lead to revenue loss, customer disputes, and compromised business integrity. From an attacker's perspective, this represents a low-effort, high-impact vector that requires minimal technical expertise to exploit, making it particularly dangerous in the current threat landscape. The vulnerability also creates potential for cascading effects within the broader WordPress ecosystem, as compromised stores may serve as entry points for further attacks or be used as part of larger attack campaigns.
Security practitioners should immediately implement mitigation strategies to protect affected systems while planning for plugin updates. The most immediate and effective mitigation involves upgrading to the patched version of the Stripe Payment Plugin for WooCommerce, which addresses the missing capability check in the eh_callback_handler function. Organizations should also implement network-level controls such as rate limiting and IP whitelisting for payment callback endpoints to reduce attack surface. The vulnerability aligns with ATT&CK technique T1078.004, which covers "Valid Accounts: Cloud Accounts," as attackers may exploit this weakness to manipulate order data without requiring elevated privileges. Additionally, implementing proper input validation and output encoding practices, as recommended by OWASP guidelines, would help prevent similar vulnerabilities from occurring in other components. Regular security audits of WordPress plugins and core systems should include checks for capability validation and access control mechanisms to ensure that all functions requiring administrative privileges properly verify user authorization levels.