CVE - CVE-2023-28846

CVE-ID
CVE-2023-28846	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#passive-health-checks URL:https://docs.nginx.com/nginx/admin-guide/load-balancer/http-health-check/#passive-health-checks MISC:https://github.com/unpoly/unpoly-rails/ URL:https://github.com/unpoly/unpoly-rails/ MISC:https://github.com/unpoly/unpoly-rails/commit/cd9ad0007daceeb3b2354fdcab4f88350427bf16 URL:https://github.com/unpoly/unpoly-rails/commit/cd9ad0007daceeb3b2354fdcab4f88350427bf16 MISC:https://github.com/unpoly/unpoly-rails/security/advisories/GHSA-m875-3xf6-mf78 URL:https://github.com/unpoly/unpoly-rails/security/advisories/GHSA-m875-3xf6-mf78 MISC:https://makandracards.com/operations/537537-nginx-proxy-buffer-tuning URL:https://makandracards.com/operations/537537-nginx-proxy-buffer-tuning MISC:https://tryhexadecimal.com/guides/http/414-request-uri-too-long URL:https://tryhexadecimal.com/guides/http/414-request-uri-too-long MISC:https://unpoly.com/up.protocol URL:https://unpoly.com/up.protocol
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20230324	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20230324)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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