CVE-2022-30779 in Laravel
Summary
by MITRE • 05/16/2022
Laravel 9.1.8, when processing attacker-controlled data for deserialization, allows Remote Code Execution via an unserialize pop chain in __destruct in GuzzleHttp\Cookie\FileCookieJar.php.
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Analysis
by VulDB Data Team • 05/18/2022
This vulnerability exists within the Laravel framework version 9.1.8 and specifically targets the deserialization process when handling attacker-controlled data. The flaw manifests in the GuzzleHttp\Cookie\FileCookieJar.php file where a unserialize pop chain is executed during the __destruct method, creating a remote code execution vector that can be exploited by malicious actors. The vulnerability stems from insufficient input validation and sanitization of serialized data that originates from user-controllable sources, allowing attackers to craft malicious serialized objects that execute arbitrary code when deserialized.
The technical exploitation occurs through a carefully crafted serialized object that leverages the unserialize function's ability to execute code during object reconstruction. When the FileCookieJar class is destroyed, its __destruct method triggers the unserialize process, which then follows a chain of method calls that ultimately leads to code execution on the target system. This type of vulnerability is classified as a deserialization attack pattern that aligns with CWE-502, which specifically addresses deserialization of untrusted data. The attack chain typically involves creating a malicious serialized object that, when processed, triggers the execution of unintended commands on the server.
The operational impact of this vulnerability is severe as it provides attackers with complete remote code execution capabilities on the affected Laravel application server. An attacker can execute arbitrary commands with the privileges of the web server process, potentially leading to full system compromise, data exfiltration, or further lateral movement within the network. This vulnerability is particularly dangerous because it can be exploited without authentication, making it an attractive target for automated attacks. The attack surface is broad as any application using Laravel 9.1.8 that processes user-controllable data through the cookie jar functionality could be affected.
Mitigation strategies should focus on immediate patching of the Laravel framework to version 9.1.9 or later where this vulnerability has been addressed. Organizations should also implement input validation and sanitization measures to prevent untrusted data from reaching deserialization points, and consider disabling unserialize functionality where possible. Network-based mitigations such as web application firewalls can help detect and block malicious serialized data patterns. The vulnerability demonstrates the importance of secure coding practices and proper input validation as outlined in the OWASP Top Ten, particularly addressing the risks associated with deserialization attacks and the principle of least privilege in application design. Additionally, implementing proper monitoring and logging of deserialization activities can help detect exploitation attempts and provide early warning of potential compromises.