CVE-2020-5220 in Sylius
Summary
by MITRE
Sylius ResourceBundle accepts and uses any serialisation groups to be passed via a HTTP header. This might lead to data exposure by using an unintended serialisation group - for example it could make Shop API use a more permissive group from Admin API. Anyone exposing an API with ResourceBundle's controller is affected. The vulnerable versions are: <1.3 || >=1.3.0 <=1.3.12 || >=1.4.0 <=1.4.5 || >=1.5.0 <=1.5.0 || >=1.6.0 <=1.6.2. The patch is provided for Sylius ResourceBundle 1.3.13, 1.4.6, 1.5.1 and 1.6.3, but not for any versions below 1.3.
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Analysis
by VulDB Data Team • 03/27/2024
The vulnerability identified as CVE-2020-5220 resides within the Sylius ResourceBundle component, which is a critical part of the Sylius e-commerce platform's API architecture. This flaw represents a significant security weakness that allows attackers to manipulate serialization group parameters through HTTP headers, potentially leading to unauthorized data exposure. The issue stems from the ResourceBundle's permissive handling of serialization groups, which are used to control what data fields are included in API responses. When an application exposes APIs using ResourceBundle controllers, any HTTP header containing serialization group information is blindly accepted and processed without proper validation or authorization checks.
The technical exploitation of this vulnerability occurs through manipulation of HTTP headers that specify serialization groups, allowing an attacker to request data using serialization configurations that should be restricted to administrative users or specific contexts. This misconfiguration enables a scenario where a regular shop API user could potentially access data that should only be available through the more privileged admin API serialization groups. The vulnerability affects multiple version ranges including Sylius ResourceBundle versions less than 1.3, versions 1.3.0 through 1.3.12, 1.4.0 through 1.4.5, 1.5.0 through 1.5.0, and 1.6.0 through 1.6.2, indicating a widespread issue across the platform's release history. The flaw directly maps to CWE-200, which addresses information exposure through improper access control, and also relates to CWE-22, representing improper limitation of a pathname to a restricted directory.
From an operational impact perspective, this vulnerability creates a serious risk for e-commerce platforms using Sylius, as it could allow unauthorized access to sensitive customer data, order information, product details, or administrative configurations that should remain protected. The exposure occurs at the API level where data serialization controls are bypassed, potentially enabling attackers to gather comprehensive information about the platform's operations and user base. Attackers could leverage this weakness to perform data enumeration, identify system components, and potentially escalate privileges within the application's API layer. The vulnerability aligns with ATT&CK technique T1213, which involves data from information repositories, and represents a privilege escalation vector through improper access control mechanisms.
The mitigation strategy involves upgrading to the patched versions of Sylius ResourceBundle, specifically 1.3.13, 1.4.6, 1.5.1, and 1.6.3, which implement proper validation of serialization groups and prevent unauthorized access to restricted data sets. Organizations should also implement additional security controls such as API gateway filtering to restrict HTTP header manipulation, implement proper input validation for serialization parameters, and conduct thorough security testing of API endpoints to ensure that serialization group access is properly restricted. The patch addresses the core issue by enforcing strict validation of serialization groups and preventing the use of unauthorized or unintended serialization configurations that could expose sensitive data through the API layer.