CVE-2022-39379: Fluentd vulnerable to remote code execution due to insecure deserialization (in non-default configuration)

First published: Wed Nov 02 2022(Updated: )

Fluentd collects events from various data sources and writes them to files, RDBMS, NoSQL, IaaS, SaaS, Hadoop and so on. A remote code execution (RCE) vulnerability in non-default configurations of Fluentd allows unauthenticated attackers to execute arbitrary code via specially crafted JSON payloads. Fluentd setups are only affected if the environment variable `FLUENT_OJ_OPTION_MODE` is explicitly set to `object`. Please note: The option FLUENT_OJ_OPTION_MODE was introduced in Fluentd version 1.13.2. Earlier versions of Fluentd are not affected by this vulnerability. This issue was patched in version 1.15.3. As a workaround do not use `FLUENT_OJ_OPTION_MODE=object`.

Credit: security-advisories@github.com

Affected Software	Affected Version	How to fix
Fluentd Fluentd	>=1.13.2<1.15.3
Fedoraproject Fedora	=37

Remedy

https://github.com/fluent/fluentd/commit/48e5b85dab1b6d4c273090d538fc11b3f2fd8135

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