CVE-2019-12401: XML resource consumption attack

September 10, 2019 (updated October 10, 2019)

Solr is vulnerable to an XML resource consumption attack (a.k.a. Lol Bomb) via the update handler. By leveraging XML DOCTYPE and ENTITY type elements, the attacker can create a pattern that will expand when the server parses the XML causing OOMs.

References

mail-archives.us.apache.org/mod_mbox/www-announce/201909.mbox/%3CCAECwjAXU4%3DkAo5DeUJw7Kvk67sgCmajAN7LGZQNjbjZ8gv%3DBdw%40mail.gmail.com%3E
nvd.nist.gov/vuln/detail/CVE-2019-12401

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