#VU52061 Improper Authorization in Apache Solr - CVE-2021-29943

Vulnerability identifier: #VU52061

Vulnerability risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-29943

CWE-ID: CWE-285

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Apache Solr
Client/Desktop applications / Other client software

Vendor: Apache Foundation

Description

The vulnerability allows a remote user to gain access to otherwise restricted functionality.

The vulnerability exists in ConfigurableInternodeAuthHadoopPlugin implementation. Apache Solr forwards distributed requests using server credentials instead of original client credentials. A remote user can abuse such behavior to gain access to otherwise restricted functionality.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Apache Solr: 8.0.0, 8.1.0 - 8.1.1, 8.2.0, 8.3.0 - 8.3.1, 8.4.0 - 8.4.1, 8.5.0 - 8.5.2, 8.6.0 - 8.6.3, 8.7.0, 8.8.0 - 8.8.1

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External links
https://seclists.org/oss-sec/2021/q2/17

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.