CVE-2022-41906 in OpenSearch Notifications Plugin
Summary
by MITRE • 11/11/2022
OpenSearch Notifications is a notifications plugin for OpenSearch that enables other plugins to send notifications via Email, Slack, Amazon Chime, Custom web-hook etc channels. A potential SSRF issue in OpenSearch Notifications Plugin 2.2.0 and below could allow an existing privileged user to enumerate listening services or interact with configured resources via HTTP requests exceeding the Notification plugin's intended scope. OpenSearch 2.2.1+ contains the fix for this issue. There are currently no recommended workarounds.
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Analysis
by VulDB Data Team • 12/17/2022
The vulnerability identified as CVE-2022-41906 affects the OpenSearch Notifications plugin, a critical component that facilitates communication across various channels including email, Slack, Amazon Chime, and custom webhooks. This plugin serves as an essential integration point for notification delivery within the OpenSearch ecosystem, making it a potential target for attackers seeking to expand their attack surface. The flaw manifests as a Server-Side Request Forgery vulnerability that specifically impacts versions 2.2.0 and earlier, creating a significant security risk for organizations relying on these notification capabilities.
The technical implementation of this vulnerability stems from insufficient input validation and sanitization within the notification plugin's HTTP request handling mechanisms. A privileged user with existing access to the OpenSearch system can exploit this weakness to make HTTP requests that bypass the intended boundaries of the notification service. This allows for unauthorized enumeration of services listening on the local network or interaction with resources that should remain isolated from external access. The vulnerability operates by manipulating the plugin's configuration parameters to redirect requests to arbitrary destinations, effectively creating a tunnel through which attackers can probe internal systems or access configured resources without proper authorization.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables attackers to perform reconnaissance activities against internal services that may not be directly exposed to the internet. An attacker could potentially discover running services, identify system configurations, or even access sensitive internal resources that are typically protected by network segmentation. This capability significantly increases the attack surface for organizations using OpenSearch Notifications, as it provides a legitimate access point through which malicious actors can explore network infrastructure and identify additional vulnerabilities. The vulnerability is particularly concerning because it requires only existing privileged access rather than additional authentication, making it accessible to insiders or compromised accounts.
Organizations utilizing OpenSearch versions 2.2.0 and earlier should immediately implement the available patch as the primary mitigation strategy. The fix included in OpenSearch 2.2.1 addresses the core issue by implementing proper input validation and request boundary enforcement within the notification plugin. Security teams should conduct comprehensive assessments to ensure all instances have been updated and verify that no workarounds or temporary solutions have been implemented that might introduce additional risks. The vulnerability aligns with CWE-918, which specifically addresses server-side request forgery vulnerabilities, and maps to ATT&CK technique T1071.004 for application layer protocol usage, particularly HTTP traffic manipulation. Given the nature of the flaw and its potential for internal network reconnaissance, organizations should also review their access controls and implement additional monitoring around notification plugin usage to detect anomalous behavior that might indicate exploitation attempts.