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Security Advisories: GSA_kwCzR0hTQS1oMzc2LWoyNjItdmhxNs0g_w

RCE in H2 Console

Impact

H2 Console in versions since 1.1.100 (2008-10-14) to 2.0.204 (2021-12-21) inclusive allows loading of custom classes from remote servers through JNDI.

H2 Console doesn't accept remote connections by default. If remote access was enabled explicitly and some protection method (such as security constraint) wasn't set, an intruder can load own custom class and execute its code in a process with H2 Console (H2 Server process or a web server with H2 Console servlet).

It is also possible to load them by creation a linked table in these versions, but it requires ADMIN privileges and user with ADMIN privileges has full access to the Java process by design. These privileges should never be granted to untrusted users.

Patches

Since version 2.0.206 H2 Console and linked tables explicitly forbid attempts to specify LDAP URLs for JNDI. Only local data sources can be used.

Workarounds

H2 Console should never be available to untrusted users.

-webAllowOthers is a dangerous setting that should be avoided.

H2 Console Servlet deployed on a web server can be protected with a security constraint:
https://h2database.com/html/tutorial.html#usingH2ConsoleServlet
If webAllowOthers is specified, you need to uncomment and edit <security-role> and <security-constraint> as necessary. See documentation of your web server for more details.

References

This issue was found and privately reported to H2 team by JFrog Security's vulnerability research team with detailed information.

Permalink: https://github.com/advisories/GHSA-h376-j262-vhq6
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1oMzc2LWoyNjItdmhxNs0g_w
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: over 2 years ago
Updated: over 1 year ago


CVSS Score: 9.8
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Identifiers: GHSA-h376-j262-vhq6, CVE-2021-42392
References: Repository: https://github.com/h2database/h2database
Blast Radius: 53.2

Affected Packages

maven:com.h2database:h2
Dependent packages: 7,857
Dependent repositories: 266,808
Downloads:
Affected Version Ranges: >= 1.1.100, < 2.0.206
Fixed in: 2.0.206
All affected versions: 1.1.100, 1.1.101, 1.1.102, 1.1.103, 1.1.104, 1.1.105, 1.1.106, 1.1.107, 1.1.108, 1.1.109, 1.1.110, 1.1.111, 1.1.112, 1.1.113, 1.1.114, 1.1.115, 1.1.116, 1.1.117, 1.1.118, 1.1.119, 1.2.120, 1.2.121, 1.2.122, 1.2.123, 1.2.124, 1.2.125, 1.2.126, 1.2.127, 1.2.128, 1.2.129, 1.2.130, 1.2.131, 1.2.132, 1.2.133, 1.2.134, 1.2.135, 1.2.136, 1.2.137, 1.2.138, 1.2.139, 1.2.140, 1.2.141, 1.2.142, 1.2.143, 1.2.144, 1.2.145, 1.2.147, 1.3.146, 1.3.148, 1.3.149, 1.3.150, 1.3.151, 1.3.152, 1.3.153, 1.3.154, 1.3.155, 1.3.156, 1.3.157, 1.3.158, 1.3.159, 1.3.160, 1.3.161, 1.3.162, 1.3.163, 1.3.164, 1.3.165, 1.3.166, 1.3.167, 1.3.168, 1.3.169, 1.3.170, 1.3.171, 1.3.172, 1.3.173, 1.3.174, 1.3.175, 1.3.176, 1.4.177, 1.4.178, 1.4.179, 1.4.180, 1.4.181, 1.4.182, 1.4.183, 1.4.184, 1.4.185, 1.4.186, 1.4.187, 1.4.188, 1.4.189, 1.4.190, 1.4.191, 1.4.192, 1.4.193, 1.4.194, 1.4.195, 1.4.196, 1.4.197, 1.4.198, 1.4.199, 1.4.200, 2.0.202, 2.0.204
All unaffected versions: 1.0.57, 1.0.58, 1.0.59, 1.0.60, 1.0.61, 1.0.62, 1.0.63, 1.0.64, 1.0.65, 1.0.66, 1.0.67, 1.0.68, 1.0.69, 1.0.70, 1.0.71, 1.0.72, 1.0.73, 1.0.74, 1.0.75, 1.0.76, 1.0.77, 1.0.78, 1.0.79, 1.0.20061217, 1.0.20070304, 1.0.20070429, 1.0.20070617, 2.0.206, 2.1.210, 2.1.212, 2.1.214, 2.2.220, 2.2.222, 2.2.224, 2.3.230