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                           CERT-Renater

                 Note d'Information No. 2022/VULN013
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DATE                : 11/01/2022

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running H2 Console

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https://github.com/h2database/h2database/security/advisories/GHSA-h376-j262-vhq6
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Description
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.

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+ CERT-RENATER       |    tel : 01-53-94-20-44          +
+ 23/25 Rue Daviel   |    fax : 01-53-94-20-41          +
+ 75013 Paris        |    email:cert@support.renater.fr +
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