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CVE-2022-23476— Unchecked return value from xmlTextReaderExpand in Nokogiri

Quick assessment

Affected
sparklemotion nokogiri
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.

Nokogiri是一款用于解析Ruby中HTML和XML的开源软件库。 Nokogiri 1.13.8和1.13.9版本存在安全漏洞，该漏洞源于其Nokogiri::XML::Reader#attribute_hash方法中检查xmlTextReaderExpand的返回值失败导致在解析无效标记时出现空指针异常。

CVSS 7.5 · High EPSS 1.68% · P75

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-23476

Vulnerability Information
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Vulnerability Title
Unchecked return value from xmlTextReaderExpand in Nokogiri
Source: CVE Program / CVE List V5
Vulnerability Description
Nokogiri is an open source XML and HTML library for the Ruby programming language. Nokogiri `1.13.8` and `1.13.9` fail to check the return value from `xmlTextReaderExpand` in the method `Nokogiri::XML::Reader#attribute_hash`. This can lead to a null pointer exception when invalid markup is being parsed. For applications using `XML::Reader` to parse untrusted inputs, this may potentially be a vector for a denial of service attack. Users are advised to upgrade to Nokogiri `>= 1.13.10`. Users may be able to search their code for calls to either `XML::Reader#attributes` or `XML::Reader#attribute_hash` to determine if they are affected.
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
未加检查的返回值
Source: CVE Program / CVE List V5
Vulnerability Title
Nokogiri 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nokogiri是一款用于解析Ruby中HTML和XML的开源软件库。 Nokogiri 1.13.8和1.13.9版本存在安全漏洞，该漏洞源于其Nokogiri::XML::Reader#attribute_hash方法中检查xmlTextReaderExpand的返回值失败导致在解析无效标记时出现空指针异常。
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
sparklemotion nokogiri >= 1.13.8, < 1.13.10 -

II. Public POCs for CVE-2022-23476

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III. Intelligence Information for CVE-2022-23476

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Patches & Fixes for CVE-2022-23476 (2)

Vendor Advisories for CVE-2022-23476 (1)

IV. Related Vulnerabilities

Same product: nokogiri
Same vendor: sparklemotion
Same weakness: CWE-252

V. Comments for CVE-2022-23476

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