CVE-2022-34032 in NJS
Summary
by MITRE • 07/19/2022
Nginx NJS v0.7.5 was discovered to contain a segmentation violation in the function njs_value_own_enumerate at src/njs_value.c.
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Analysis
by VulDB Data Team • 08/06/2022
The vulnerability identified as CVE-2022-34032 represents a critical segmentation fault within the Nginx JavaScript (NJS) runtime environment version 0.7.5. This flaw exists within the njs_value_own_enumerate function located in the src/njs_value.c source file, indicating a fundamental memory management issue that could potentially lead to system instability or arbitrary code execution. The NJS module serves as a JavaScript engine integrated into Nginx web servers, enabling dynamic content generation and server-side scripting capabilities that are increasingly common in modern web infrastructure deployments.
This segmentation violation constitutes a memory corruption vulnerability that falls under the CWE-125 weakness category, specifically related to out-of-bounds read conditions that can lead to unauthorized memory access patterns. The flaw occurs during the enumeration of object properties within the JavaScript runtime, suggesting that when Nginx processes JavaScript code that involves property iteration or enumeration operations, the system may attempt to access memory locations beyond the allocated boundaries. Such behavior creates potential attack vectors where malicious actors could craft specific JavaScript payloads to trigger the segmentation fault, potentially leading to denial of service conditions or more severe exploitation scenarios.
The operational impact of this vulnerability extends beyond simple service disruption, as it affects the core functionality of Nginx servers that utilize JavaScript processing capabilities. Organizations running Nginx instances with JavaScript modules enabled are at risk of experiencing unexpected server crashes, which could result in denial of service for legitimate users. The vulnerability's exploitation potential increases when considering that NJS is commonly used in high-traffic web environments where server stability and reliability are paramount. Attackers could leverage this flaw to repeatedly crash web servers, causing significant operational disruption and potentially affecting business continuity for organizations relying on Nginx for their web infrastructure.
Mitigation strategies should prioritize immediate patching of affected Nginx installations to the latest stable versions that contain fixes for this segmentation fault. System administrators should also implement monitoring solutions to detect unusual crash patterns or memory access violations that could indicate exploitation attempts. The ATT&CK framework categorizes this type of vulnerability under T1548.002 for privilege escalation and T1499.004 for network denial of service, highlighting the multi-faceted nature of potential exploitation. Organizations should consider implementing network segmentation and access controls to limit exposure of vulnerable Nginx instances, while also ensuring that JavaScript processing capabilities are only enabled when absolutely necessary for specific server functions. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar memory corruption issues in other components of the web infrastructure stack.