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CVE-2023-28846— Denial of Service in unpoly-rails

Quick assessment

Affected
unpoly unpoly-rails
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Unpoly是一个用于服务器端Web应用程序的JavaScript框架。 Unpoly 2.7.2.2之前版本存在资源管理错误漏洞，该漏洞源于存在拒绝服务 (DoS) 漏洞。

CVSS 5.9 · Medium EPSS 1.03% · P61
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I. Basic Information for CVE-2023-28846

Vulnerability Information
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Vulnerability Title
Denial of Service in unpoly-rails
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Unpoly 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Unpoly是一个用于服务器端Web应用程序的JavaScript框架。 Unpoly 2.7.2.2之前版本存在资源管理错误漏洞，该漏洞源于存在拒绝服务 (DoS) 漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
unpoly unpoly-rails < 2.7.2.2 -

II. Public POCs for CVE-2023-28846

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III. Intelligence Information for CVE-2023-28846

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Patches & Fixes for CVE-2023-28846 (1)

Vendor Advisories for CVE-2023-28846 (1)

Other References for CVE-2023-28846 (5)

IV. Related Vulnerabilities

Same weakness: CWE-400

V. Comments for CVE-2023-28846

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