6.5

CVSS Score

3.0

-

CVSS Score

Basic Information

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CVE-2024-6863

CVE-2024-6863: H2O Vulnerable to Execution of Arbitrary Files

In h2oai/h2o-3 version 3.46.0, an endpoint exposing a custom EncryptionTool allows an attacker to encrypt any files on the target server with a key of their choosing. The chosen key can also be overwritten, resulting in ransomware-like behavior. This vulnerability makes it possible for an attacker to encrypt arbitrary files with keys of their choice, making it exceedingly difficult for the target to recover the keys needed for decryption.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2024-6863

CVE-2024-6863:

6.5

CVSS Score

3.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
h2o	pip
ai.h2o:h2o-core	maven

Technical Details

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Miggo AI

Root Cause Analysis

The vulnerability stems from the EncryptionTool.encrypt() method, which performs file encryption using parameters that can be controlled by an attacker when exposed via an API endpoint. The method lacks validation for: 1) input/output file paths (allowing arbitrary file access), and 2) key material (via readKey() which uses user-controlled _keystore_file and _password fields). This matches the CWE-749 pattern of exposing dangerous functionality (file encryption with external control of critical parameters). The provided code shows the method is designed to accept runtime arguments without sanitization, making it the clear vulnerability source when exposed to untrusted inputs.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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