CVE-2018-1000641 in YesWiki
Summary
by MITRE
YesWiki version <= cercopitheque beta 1 contains a PHP Object Injection vulnerability in Unserialising user entered parameter in i18n.inc.php that can result in execution of code, disclosure of information.
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Analysis
by VulDB Data Team • 05/02/2023
The vulnerability identified as CVE-2018-1000641 represents a critical PHP Object Injection flaw within the YesWiki content management system version cercopitheque beta 1 and earlier. This vulnerability resides in the i18n.inc.php file where user-provided input is improperly handled during the unserialization process. The flaw allows attackers to inject malicious PHP objects that can be executed when the system processes user-entered parameters, creating a significant security risk that can be exploited for remote code execution and information disclosure.
The technical implementation of this vulnerability stems from the insecure handling of serialized data within the internationalization framework of YesWiki. When the system attempts to unserialize user-controlled input without proper validation or sanitization, it creates an opportunity for attackers to craft malicious serialized objects that contain executable PHP code. This type of vulnerability falls under CWE-502 which specifically addresses deserialization of untrusted data, making it a well-documented and dangerous class of security flaw. The attack vector typically involves sending crafted serialized data through HTTP parameters that are then processed by the vulnerable unserialize() function in the i18n.inc.php script.
The operational impact of this vulnerability extends beyond simple code execution to include comprehensive information disclosure and potential system compromise. Attackers can leverage this flaw to execute arbitrary commands on the affected server, potentially gaining full control over the web application and underlying infrastructure. The vulnerability affects not only the immediate execution environment but also poses risks to data confidentiality and system integrity. From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter and T1566.001 for valid accounts, as it allows for remote code execution and can be used to establish persistent access to compromised systems.
Mitigation strategies for CVE-2018-1000641 should prioritize immediate patching of the affected YesWiki version to the latest stable release that addresses the serialization vulnerability. Organizations should implement input validation and sanitization measures to prevent malicious serialized data from being processed, while also considering the implementation of web application firewalls to detect and block suspicious parameter patterns. Additionally, the principle of least privilege should be enforced by running the web application with minimal required permissions and implementing proper output encoding to prevent potential data leakage. Security monitoring should include detection of unusual unserialize operations and parameter patterns that may indicate exploitation attempts, with regular security assessments to identify similar vulnerabilities in other components of the application stack.