Vulnerability identifier: #VU52062

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29262

CWE-ID: CWE-284

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 attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. When starting Apache Solr, configured with the SaslZkACLProvider or VMParamsAllAndReadonlyDigestZkACLProvider and no existing security.json znode, if the optional read-only user is configured then Solr would not treat that node as a sensitive path and would allow it to be readable.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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

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External links
http://seclists.org/oss-sec/2021/q2/18

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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