CVE-2022-41852 in JXPath
Summary
by MITRE • 10/06/2022
Those using JXPath to interpret untrusted XPath expressions may be vulnerable to a remote code execution attack. All JXPathContext class functions processing a XPath string are vulnerable except compile() and compilePath() function. The XPath expression can be used by an attacker to load any Java class from the classpath resulting in code execution.
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Analysis
by VulDB Data Team • 10/30/2022
The vulnerability identified as CVE-2022-41852 represents a critical remote code execution flaw within the JXPath library ecosystem. This vulnerability specifically targets applications that utilize JXPathContext class functions to process XPath expressions derived from untrusted sources. The flaw exists in the interpretation of XPath strings through various JXPathContext methods, creating a pathway for malicious actors to execute arbitrary Java code on affected systems. The vulnerability is particularly concerning because it affects multiple functions within the JXPathContext class, with the exception of compile() and compilePath() functions which remain unaffected. This widespread impact across the JXPathContext API surface demonstrates the severity of the underlying architectural flaw.
The technical root cause of this vulnerability lies in the improper handling of XPath expressions that contain malicious class loading directives. When JXPath processes untrusted XPath strings, it fails to adequately validate or sanitize the input before executing operations that could load arbitrary Java classes from the classpath. This behavior creates a direct pathway for attackers to leverage XPath expression syntax to trigger class loading mechanisms within the Java runtime environment. The vulnerability essentially allows attackers to bypass normal security boundaries and execute code with the privileges of the running application, potentially leading to complete system compromise. This flaw operates at the intersection of XPath injection and Java class loading, creating a unique attack vector that leverages the flexibility of XPath expressions to manipulate the Java class loading mechanism.
The operational impact of CVE-2022-41852 extends beyond simple code execution, as it fundamentally undermines the security assumptions of applications relying on JXPath for expression processing. Attackers can exploit this vulnerability to load malicious classes from the application's classpath, potentially accessing sensitive data, establishing persistence mechanisms, or escalating privileges within the affected system. The vulnerability affects any application that accepts user input through XPath expressions and processes them using JXPathContext methods, making it particularly dangerous in web applications, enterprise systems, and any environment where XPath expressions are dynamically constructed from external sources. The remote nature of the attack means that exploitation can occur without requiring physical access to the target system, making it an attractive vector for attackers seeking to compromise large-scale deployments.
Security mitigations for this vulnerability primarily focus on input validation and proper sanitization of XPath expressions before processing. Organizations should implement strict validation mechanisms to prevent malicious XPath constructs from being processed by JXPathContext functions. The recommended approach includes whitelisting acceptable XPath patterns, implementing comprehensive input filtering, and avoiding the direct processing of untrusted XPath strings. Additionally, users should consider upgrading to patched versions of the JXPath library where available, as the vulnerability has been addressed in subsequent releases. Organizations should also implement monitoring and logging mechanisms to detect potential exploitation attempts, particularly focusing on unusual class loading patterns or unexpected XPath expression processing activities. This vulnerability aligns with CWE-74 and CWE-94 categories related to injection flaws and code execution, and maps to ATT&CK techniques involving command and control communications and privilege escalation through code injection. The remediation strategy should include comprehensive code reviews to identify all potential usage of vulnerable JXPathContext functions and implementation of proper security controls around XPath expression processing.