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GHSA-5866-49gr-22v4: REXML DoS vulnerability

Impact

The REXML gem before 3.3.2 has a DoS vulnerability when it parses an XML that has many entity expansions with SAX2 or pull parser API.

If you need to parse untrusted XMLs with SAX2 or pull parser API, you may be impacted to this vulnerability.

Patches

The REXML gem 3.3.3 or later include the patch to fix the vulnerability.

Workarounds

Don’t parse untrusted XMLs with SAX2 or pull parser API.

References

  • https://www.ruby-lang.org/en/news/2008/08/23/dos-vulnerability-in-rexml/ : This is a similar vulnerability
  • https://www.ruby-lang.org/en/news/2024/08/01/dos-rexml-cve-2024-41946/: An announce on www.ruby-lang.org
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  1. GitHub Advisory Database
  2. GitHub Reviewed
  3. CVE-2024-41946

REXML DoS vulnerability

Moderate severity GitHub Reviewed Published Aug 1, 2024 in ruby/rexml • Updated Aug 2, 2024

Package

Affected versions

< 3.3.3

Description

Published to the GitHub Advisory Database

Aug 2, 2024

Severity

CVSS base metrics

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weaknesses

GHSA ID

GHSA-5866-49gr-22v4

Source code

Related news

Ubuntu Security Notice USN-7091-2

Ubuntu Security Notice 7091-2 - USN-7091-1 fixed several vulnerabilities in Ruby. This update provides the corresponding update for ruby2.7 in Ubuntu 20.04 LTS. It was discovered that Ruby incorrectly handled parsing of an XML document that has specific XML characters in an attribute value using REXML gem. An attacker could use this issue to cause Ruby to crash, resulting in a denial of service. This issue only affected in Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. It was discovered that Ruby incorrectly handled parsing of an XML document that has many entity expansions with SAX2 or pull parser API. An attacker could use this issue to cause Ruby to crash, resulting in a denial of service. It was discovered that Ruby incorrectly handled parsing of an XML document that has many digits in a hex numeric character reference. An attacker could use this issue to cause Ruby to crash, resulting in a denial of service.

Ubuntu Security Notice USN-7091-1

Ubuntu Security Notice 7091-1 - It was discovered that Ruby incorrectly handled parsing of an XML document that has specific XML characters in an attribute value using REXML gem. An attacker could use this issue to cause Ruby to crash, resulting in a denial of service. This issue only affected in Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. It was discovered that Ruby incorrectly handled parsing of an XML document that has many entity expansions with SAX2 or pull parser API. An attacker could use this issue to cause Ruby to crash, resulting in a denial of service.

Red Hat Security Advisory 2024-6785-03

Red Hat Security Advisory 2024-6785-03 - An update for the ruby:3.3 module is now available for Red Hat Enterprise Linux 9. Issues addressed include a denial of service vulnerability.

Red Hat Security Advisory 2024-6784-03

Red Hat Security Advisory 2024-6784-03 - An update for the ruby:3.3 module is now available for Red Hat Enterprise Linux 8. Issues addressed include a denial of service vulnerability.

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