Unchecked return value from xmlTextReaderExpand
Published: December 07, 2022
SECURITY IDENTIFIERS
- CVE: CVE-2022-23476 (NVD)
- GHSA: GHSA-qv4q-mr5r-qprj
- Vendor Advisory: https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-qv4q-mr5r-qprj
GEM
SEVERITY
CVSS v3.x: 7.5 (High)
UNAFFECTED VERSIONS
<= 1.13.7
PATCHED VERSIONS
>= 1.13.10
DESCRIPTION
Summary
Nokogiri 1.13.8, 1.13.9 fails 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.
Mitigation
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.
Severity
The Nokogiri maintainers have evaluated this as High Severity 7.5 (CVSS3.1).
References
Credit
This vulnerability was responsibly reported by @davidwilemski.