Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') Affecting libxml2-python26 package, versions <0:2.9.1-6.6.42.amzn1
Threat Intelligence
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Test your applications- Snyk IDSNYK-AMZN201803-LIBXML2PYTHON26-5496890
- published4 May 2023
- disclosed23 Nov 2017
Introduced: 23 Nov 2017
CVE-2017-16931 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2018.03 libxml2-python26 to version 0:2.9.1-6.6.42.amzn1 or higher.
This issue was patched in ALAS-2023-1743.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libxml2-python26 package and not the libxml2-python26 package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2018.03 relevant fixed versions and status.
parser.c in libxml2 before 2.9.5 mishandles parameter-entity references because the NEXTL macro calls the xmlParserHandlePEReference function in the case of a '%' character in a DTD name.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-16931
- http://xmlsoft.org/news.html
- https://bugzilla.gnome.org/show_bug.cgi?id=766956
- https://github.com/GNOME/libxml2/commit/e26630548e7d138d2c560844c43820b6767251e3
- https://lists.debian.org/debian-lts-announce/2017/11/msg00041.html
- https://www.oracle.com//security-alerts/cpujul2021.html