Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') Affecting log4j package, versions <0:1.2.12-1jpp_1rh


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
3.66% (88th percentile)

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  • Snyk IDSNYK-RHEL10-LOG4J-9843983
  • published28 Apr 2025
  • disclosed1 Jun 2009

Introduced: 1 Jun 2009

CVE-2009-1955  (opens in a new tab)
CWE-776  (opens in a new tab)

How to fix?

Upgrade RHEL:10 log4j to version 0:1.2.12-1jpp_1rh or higher.
This issue was patched in RHSA-2010:0602.

NVD Description

Note: Versions mentioned in the description apply only to the upstream log4j package and not the log4j package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.

References

CVSS Base Scores

version 3.1