ADVISORIES
GEM
SEVERITY
CVSS v3.x: 5.9 (Medium)
PATCHED VERSIONS
- >= 3.3.6
DESCRIPTION
Impact
The REXML gem before 3.3.6 has a DoS vulnerability when it parses an XML that has many deep elements that have same local name attributes.
If you need to parse untrusted XMLs with tree parser API like
REXML::Document.new, you may be impacted to this vulnerability.
If you use other parser APIs such as stream parser API and SAX2
parser API, this vulnerability is not affected.
This vulnerability has been assigned the CVE identifier CVE-2024-43398. We strongly recommend upgrading the REXML gem.
Patches
The REXML gem 3.3.6 or later include the patch to fix the vulnerability.
Workarounds
Don't parse untrusted XMLs with tree parser API.
Affected versions
REXML gem 3.3.5 or prior
Credits
Thanks to l33thaxor for discovering this issue.
History
Originally published at 2024-08-22 03:00:00 (UTC)
RELATED
- https://nvd.nist.gov/vuln/detail/CVE-2024-43398
- https://www.ruby-lang.org/en/news/2024/08/22/dos-rexml-cve-2024-43398
- https://github.com/ruby/rexml/security/advisories/GHSA-vmwr-mc7x-5vc3
- https://github.com/ruby/rexml/commit/7cb5eaeb221c322b9912f724183294d8ce96bae3
- https://github.com/ruby/rexml/releases/tag/v3.3.6
- https://github.com/advisories/GHSA-vmwr-mc7x-5vc3