CyberRota Analysis
AI-GeneratedLemur versions prior to 1.9.2 are vulnerable to a critical server-side request forgery (SSRF) that allows authenticated users to manipulate the ACME authority's URL, potentially exposing sensitive cloud instance metadata and internal service credentials. Additionally, an authorization flaw could enable unauthorized access to certificate key material, compromising long-lived PKI private keys. Organizations using Lemur for TLS certificate management should prioritize upgrading to version 1.9.2 to mitigate these risks.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
Lemur manages TLS certificate creation. Prior to 1.9.2, authenticated users could influence an ACME authority acme_url without an effective server-side destination restriction and trigger AcmeHandler.setup_acme_client to make backend requests. An attacker could target cloud instance metadata or internal services from Lemur network context, potentially obtaining credentials available to the host. The advisory also identifies creator-equality authorization behavior that could preserve access to certificate key material after ownership or role changes, with insufficient export_private_key audit context to distinguish that access path. Together, the acme_url server-side request forgery and authorization weakness could expose cloud credentials and long-lived PKI private-key access. The fix adds ACME_DIRECTORY_HOST_ALLOWLIST validation and enriches key-export audit events with creator and current-owner context. This issue is fixed in version 1.9.2.