CVE-2019-12401 Apache Solr vulnerable to XML Bomb

What is CVE-2019-12401?

CVE-2019-12401 is a high-severity denial of service vulnerability in Apache Solr, published on 10 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Solr versions 1.3.0 to 1.4.1, 3.1.0 to 3.6.2 and 4.0.0 to 4.10.4 are vulnerable to an XML resource consumption attack (a.k.a. Lol Bomb) via it’s 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.

Weakness: CWE-776

Which versions are affected by CVE-2019-12401?

2 open source packages ship an affected version, including org.apache.solr:solr-core. It affects 1 product.

Products include Apache Solr.

How do I fix CVE-2019-12401?

Upgrade org.apache.solr:solr-core to 5.0.0 or later.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-12401 being exploited?

There is no known exploitation of CVE-2019-12401 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Other vulnerabilities in Apache Solr

• CVE-2019-17558 Apache Solr VelocityResponseWriter Plug-In Remote Code Execution Exploited High 7.5
• CVE-2019-0193 Apache Solr DataImportHandler Code Injection Exploited High 7.2
• CVE-2024-45216 Apache Solr: Authentication bypass possible using a fake URL Path ending Critical 9.8
• CVE-2021-44548 Apache Solr information disclosure vulnerability through DataImportHandler Critical 9.8
• CVE-2021-27905 SSRF vulnerability with the Replication handler Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jq2w-w7v2-69q5.