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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2023-28846 Detail

Current Description

Unpoly is a JavaScript framework for server-side web applications. There is a possible Denial of Service (DoS) vulnerability in the `unpoly-rails` gem that implements the Unpoly server protocol for Rails applications. This issues affects Rails applications that operate as an upstream of a load balancer's that uses passive health checks. The `unpoly-rails` gem echoes the request URL as an `X-Up-Location` response header. By making a request with exceedingly long URLs (paths or query string), an attacker can cause unpoly-rails to write a exceedingly large response header. If the response header is too large to be parsed by a load balancer downstream of the Rails application, it may cause the load balancer to remove the upstream from a load balancing group. This causes that application instance to become unavailable until a configured timeout is reached or until an active healthcheck succeeds. This issue has been fixed and released as version 2.7.2.2 which is available via RubyGems and GitHub. Users unable to upgrade may: Configure your load balancer to use active health checks, e.g. by periodically requesting a route with a known response that indicates healthiness; Configure your load balancer so the maximum size of response headers is at least twice the maximum size of a URL; or instead of changing your server configuration you may also configure your Rails application to delete redundant `X-Up-Location` headers set by unpoly-rails.


View Analysis Description

Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#passive-health-checks Technical Description 
https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#passive-health-checks Technical Description 
https://github.com/unpoly/unpoly-rails/ Product 
https://github.com/unpoly/unpoly-rails/ Product 
https://github.com/unpoly/unpoly-rails/commit/cd9ad0007daceeb3b2354fdcab4f88350427bf16 Patch  Vendor Advisory 
https://github.com/unpoly/unpoly-rails/commit/cd9ad0007daceeb3b2354fdcab4f88350427bf16 Patch  Vendor Advisory 
https://github.com/unpoly/unpoly-rails/security/advisories/GHSA-m875-3xf6-mf78 Vendor Advisory 
https://github.com/unpoly/unpoly-rails/security/advisories/GHSA-m875-3xf6-mf78 Vendor Advisory 
https://makandracards.com/operations/537537-nginx-proxy-buffer-tuning Third Party Advisory 
https://makandracards.com/operations/537537-nginx-proxy-buffer-tuning Third Party Advisory 
https://tryhexadecimal.com/guides/http/414-request-uri-too-long Third Party Advisory 
https://tryhexadecimal.com/guides/http/414-request-uri-too-long Third Party Advisory 
https://unpoly.com/up.protocol Product 
https://unpoly.com/up.protocol Product 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-400 Uncontrolled Resource Consumption GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2023-28846
NVD Published Date:
03/30/2023
NVD Last Modified:
11/21/2024
Source:
GitHub, Inc.