CVE-2022-41906: 
OpenSearch vulnerability analysis and mitigation

A potential Server-Side Request Forgery (SSRF) vulnerability was discovered in the OpenSearch Notifications Plugin (CVE-2022-41906), affecting versions 2.0.0 through 2.2.1. The vulnerability could allow privileged users to enumerate listening services or interact with configured resources via HTTP requests beyond the plugin's intended scope. The issue was discovered and disclosed in 2022, with the fix being implemented in OpenSearch version 2.2.1 (GitHub Advisory).

The vulnerability exists in the OpenSearch Notifications Plugin, which enables other plugins to send notifications via Email, Slack, Amazon Chime, and Custom web-hook channels. The issue specifically relates to the host deny list functionality (opensearch.notifications.core.http.hostdenylist) which is designed to block specific IPs or IP ranges. The vulnerability allowed bypass of this security control through hostname resolution, potentially enabling unauthorized access to restricted resources (CVE Mitre). The vulnerability has been assigned a CVSS v3.0 base score of 7.7 (High), with the vector string CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N (GitHub Advisory).

The vulnerability could allow privileged users to bypass intended security controls and perform unauthorized actions, including enumerating listening services and interacting with configured resources beyond the plugin's intended scope. This could potentially lead to unauthorized access to sensitive information and systems (GitHub Advisory).

The vulnerability has been fixed in OpenSearch version 2.2.1 and later releases. The fix includes improvements to host resolution checking against the deny list and disabling of redirect following for webhooks. No alternative workarounds are recommended, and users are advised to upgrade to a patched version (GitHub PR 496, GitHub PR 507).