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GHSA-PJ6Q-4VQ4-R8CG: GHSA-PJ6Q-4VQ4-R8CG: Unauthenticated Resource Exhaustion and State Manipulation in Ech0 API

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GHSA-PJ6Q-4VQ4-R8CG: Unauthenticated Resource Exhaustion and State Manipulation in Ech0 API

Vulnerability ID: GHSA-PJ6Q-4VQ4-R8CG
CVSS Score: 5.3
Published: 2026-05-07

The Ech0 lightweight publishing platform exposes an unauthenticated, rate-unlimited API endpoint that permits arbitrary modification of content metrics. Because this endpoint directly triggers database transactions and simultaneously invalidates multiple application cache layers, it serves as an exploitable vector for resource exhaustion Denial of Service (DoS) and cache-stampede attacks.

TL;DR

An unauthenticated API endpoint in Ech0 allows attackers to artificially inflate post metrics. Repeated requests force heavy database writes and cache invalidations, causing severe resource exhaustion and denial of service.

⚠️ Exploit Status: POC

Technical Details

  • CWE ID: CWE-306, CWE-285, CWE-400
  • Attack Vector: Network
  • Privileges Required: None
  • Impact: Denial of Service (Resource Exhaustion) / Data Integrity
  • Exploit Status: Proof of Concept Available
  • CVSSv3 Score: 5.3

Affected Systems

  • lin-snow/Ech0 Go Application
  • lin-snow/Ech0 SQLite Data Layer
  • lin-snow/Ech0 Application Cache Subsystem
  • Ech0: < cecc2c19b590df85d79ea98457faa143130cd620 (Fixed in: cecc2c19b590df85d79ea98457faa143130cd620)

Code Analysis

Commit: cecc2c1

Fix commit introducing RateLimitWithIdempotency middleware for the like API endpoint

Exploit Details

  • Context Report: Basic bash script loop leveraging curl to send massive asynchronous PUT requests to the exposed API.

Mitigation Strategies

  • Implement application-level rate limiting and deduplication using token-bucket and idempotency algorithms.
  • Enforce network-level traffic throttling via Web Application Firewalls (WAF) or Edge proxies targeting the vulnerable URI path.
  • Decouple cache invalidation tasks from synchronous HTTP handlers using an asynchronous event queue.
  • Migrate deployment data storage from SQLite to a fully-featured RDBMS (PostgreSQL/MySQL) to avoid file-level write locking under load.

Remediation Steps:

  1. Update the Ech0 application repository past commit cecc2c19b590df85d79ea98457faa143130cd620.
  2. Verify that internal/router/echo.go utilizes the RateLimitWithIdempotency middleware for the PUT /echo/like/:id endpoint.
  3. Configure a reverse proxy (e.g., Nginx) to globally limit connections to /api/echo/like to a reasonable threshold (e.g., 50 requests per minute total).
  4. Monitor application logs for sudden spikes in SQLite database lock errors or high rates of cache-miss rebuilds.

References

Read the full report for GHSA-PJ6Q-4VQ4-R8CG on our website for more details including interactive diagrams and full exploit analysis.

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