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CVE-2022-23516— Uncontrolled Recursion in Loofah

Quick assessment

Affected
flavorjones loofah
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.

Loofah gem for Ruby是一款基于Ruby的、用于处理和转换HTML/XML文档的库。 Loofah gem for Ruby 2.19.1到 2.2.0版本存在安全漏洞，该漏洞源于使用递归来清理CDATA部分，使其容易出现堆栈耗尽并引发SystemStackError异常，这可能会因 CPU 资源消耗而导致拒绝服务。

CVSS 7.5 · High EPSS 1.12% · P65

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-23516

Vulnerability Information
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Vulnerability Title
Uncontrolled Recursion in Loofah
Source: CVE Program / CVE List V5
Vulnerability Description
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Loofah >= 2.2.0, < 2.19.1 uses recursion for sanitizing CDATA sections, making it susceptible to stack exhaustion and raising a SystemStackError exception. This may lead to a denial of service through CPU resource consumption. This issue is patched in version 2.19.1. Users who are unable to upgrade may be able to mitigate this vulnerability by limiting the length of the strings that are sanitized.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Loofah gem for Ruby 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Loofah gem for Ruby是一款基于Ruby的、用于处理和转换HTML/XML文档的库。 Loofah gem for Ruby 2.19.1到 2.2.0版本存在安全漏洞，该漏洞源于使用递归来清理CDATA部分，使其容易出现堆栈耗尽并引发SystemStackError异常，这可能会因 CPU 资源消耗而导致拒绝服务。
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
flavorjones loofah >= 2.2.0, < 2.19.1 -

II. Public POCs for CVE-2022-23516

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III. Intelligence Information for CVE-2022-23516

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Vendor Advisories for CVE-2022-23516 (1)

Mailing List Discussions for CVE-2022-23516 (1)

Same Patch Batch · flavorjones · 2022-12-14 · 3 CVEs total

CVE-2022-23514 7.5 HIGH Inefficient Regular Expression Complexity in Loofah
CVE-2022-23515 6.1 MEDIUM Improper neutralization of data URIs may allow XSS in Loofah

IV. Related Vulnerabilities

Same product: loofah
Same vendor: flavorjones
Same weakness: CWE-674

V. Comments for CVE-2022-23516

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