CVE-2022-33107 in ThinkPHP
Summary
by MITRE • 06/29/2022
ThinkPHP v6.0.12 was discovered to contain a deserialization vulnerability via the component vendor\league\flysystem-cached-adapter\src\Storage\AbstractCache.php. This vulnerability allows attackers to execute arbitrary code via a crafted payload.
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Analysis
by VulDB Data Team • 07/16/2022
The vulnerability identified as CVE-2022-33107 represents a critical deserialization flaw within the ThinkPHP framework version 6.0.12, specifically within the vendor component league/filesystem-cached-adapter. This issue stems from improper handling of serialized data structures within the AbstractCache.php file, creating a pathway for remote code execution attacks. The vulnerability affects applications that utilize the cached adapter functionality, making it particularly dangerous in web applications where user input may be processed through the framework's serialization mechanisms.
The technical exploitation of this vulnerability occurs through the manipulation of serialized objects within the caching system, where attacker-controlled data can be deserialized without proper validation or sanitization. When the application processes a crafted payload through the affected component, the deserialization process triggers arbitrary code execution on the target system. This type of vulnerability falls under CWE-502, which specifically addresses deserialization of untrusted data, and aligns with ATT&CK technique T1203, focusing on exploitation for execution through deserialization attacks. The flaw demonstrates a classic insecure deserialization pattern where the application fails to verify the integrity or authenticity of serialized objects before processing them.
The operational impact of CVE-2022-33107 extends beyond simple code execution, as successful exploitation can lead to complete system compromise, data exfiltration, and persistence mechanisms within the affected environment. Attackers can leverage this vulnerability to gain unauthorized access to sensitive information, modify application behavior, or establish backdoors for continued access. The vulnerability affects not only the immediate application but can potentially impact the entire server infrastructure if proper network segmentation is not implemented. Organizations running ThinkPHP 6.0.12 with the affected cached adapter component are at significant risk, particularly those that process user input through framework serialization mechanisms or utilize third-party components that may interact with the vulnerable code path.
Mitigation strategies for CVE-2022-33107 primarily focus on immediate remediation through version updates, as the vulnerability has been addressed in subsequent releases of both ThinkPHP and the affected vendor component. Organizations should prioritize upgrading to patched versions of the framework and the league/filesystem-cached-adapter package to eliminate the risk of exploitation. Additional protective measures include implementing strict input validation and sanitization protocols, restricting network access to critical components, and employing web application firewalls to monitor for suspicious deserialization patterns. Security teams should also conduct comprehensive code reviews to identify potential similar vulnerabilities in custom implementations and ensure that all third-party components are regularly updated and monitored for security advisories. The vulnerability underscores the importance of secure coding practices and proper validation of serialized data, particularly within frameworks that handle user input through complex object serialization processes.