CVE-2024-6863: Encryption of Arbitrary Files with Attacker-Controlled Key in h2oai/h2o-3
First published: Thu Mar 20 2025(Updated: )
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.
Credit: security@huntr.dev
| Affected Software | Affected Version | How to fix |
|---|---|---|
| H2O-3 | ||
| maven/ai.h2o:h2o-core | >=3.32.1.2<=3.46.0 | |
| pip/h2o | >=3.32.1.2<=3.46.0 |
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Reference Links
- https://huntr.com/bounties/10f55937-0cba-4530-897f-2abf30ed5270
- https://nvd.nist.gov/vuln/detail/CVE-2024-6863
- https://github.com/h2oai/h2o-3/blob/a20b5b19b769866ee24b217ee78b820e64c1cd6a/h2o-core/src/main/java/water/tools/EncryptionTool.java#L49
- https://github.com/advisories/GHSA-m37h-8r48-2cxj (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-6863?
CVE-2024-6863 is a critical vulnerability that allows an attacker to encrypt any files on the target server, potentially leading to data loss and ransom-like scenarios.
How do I fix CVE-2024-6863?
To fix CVE-2024-6863, it is advised to upgrade to version 3.46.1 or later of H2O-3, or implement proper access controls to the EncryptionTool endpoint.
Which versions of H2O-3 are affected by CVE-2024-6863?
CVE-2024-6863 affects H2O-3 versions from 3.32.1.2 to 3.46.0 inclusive.
What risks does CVE-2024-6863 pose to data security?
CVE-2024-6863 poses significant risks to data security, allowing unauthorized encryption of files which can lead to data loss or ransom demands.
Can CVE-2024-6863 be exploited remotely?
Yes, CVE-2024-6863 can be exploited remotely if the EncryptionTool endpoint is exposed to the internet.
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