CVE-2021-29943 Apache Solr Unprivileged users may be able to perform unauthorized read/write to collections

What is CVE-2021-29943?

CVE-2021-29943 is a critical missing authorization vulnerability in Apache Solr, published on 13 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

When using ConfigurableInternodeAuthHadoopPlugin for authentication, Apache Solr versions prior to 8.8.2 would forward/proxy distributed requests using server credentials instead of original client credentials. This would result in incorrect authorization resolution on the receiving hosts.

Weakness: CWE-863

Which versions are affected by CVE-2021-29943?

3 open source packages ship an affected version, including org.apache.solr:solr-parent and solr. It affects 1 product.

Products include Apache Solr.

How do I fix CVE-2021-29943?

Upgrade org.apache.solr:solr-parent to 8.8.2 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-29943 being exploited?

There is no known exploitation of CVE-2021-29943 in the wild and no public exploit code.

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 BIT-solr-2021-29943, GHSA-vf7p-j8x6-xvwp, UBUNTU-CVE-2021-29943.