CVE intelligence and bounded remediation

CVE-2024-23692 — Rejetto HTTP File Server Improper Neutralization of Special Elements Used in a Template Engine Vulnerability

Critical CVSS 9.8 CISA KEV

Rejetto HTTP File Server, up to and including version 2.3m, is vulnerable to a template injection vulnerability. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary commands on the affected system by sending a specially crafted HTTP request. As of the CVE assignment date, Rejetto HFS 2.3m is no longer supported.

Severity
Critical
CVSS
9.8 (3.1)
Published
2024-05-31
CISA KEV
Known exploited
Ecosystem
software/application
Weaknesses
CWE-1336, CWE-94

Affected products

  • rejetto / http_file_server

Matched remediation archetype

Command, code, expression, and template injection

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Check exposure

  • Trace untrusted values to process execution, interpreters, evaluators, template engines, dynamic imports, and administrative scripting features.
  • Determine whether the affected path is reachable across each trust boundary and which service account or host privilege it inherits.
  • Review configuration for optional execution features, unsafe compatibility modes, and shell invocation.

Remediate safely

  • Replace string-built commands or evaluated code with fixed operations and structured argument APIs that do not invoke a shell.
  • Use strict allowlists for operation identifiers and reject unexpected input before it reaches any interpreter.
  • Update the affected component and add inert regression tests covering metacharacters, encoding variants, and alternate request paths.

Authoritative sources

Complete CVE record and remediation plan

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