Auth bypass in Apache Solr
CVE-2017-9803
Apache Solr's Kerberos plugin can be configured to use delegation tokens, which allows an application to reuse the authentication of an end-user or another application. There are two issues with this functionality (when using SecurityAwareZkACLProvider type of ACL provider e.g. SaslZkACLProvider). Firstly, access to the security configuration can be leaked to users other than the solr super user. Secondly, malicious users can exploit this leaked configuration for privilege escalation to further expose/modify private data and/or disrupt operations in the Solr cluster. The vulnerability is fixed from Apache Solr 6.6.1 onwards.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.022 (81.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
- Apache Solr — versions 6.2.0, 6.2.1, 6.3.0
- Apache Software Foundation Solr — versions 6.2.0 to 6.6.0
Weakness classification (CWE)
References
- www.securityfocus.com/bid/100870 (VDB Entry, Third Party Advisory, vdb-entry)
- mail-archives.us.apache.org/mod_mbox/www-announce/201709.mbox/<CAOOKt53AOScg04z… (mailing-list)
Frequently asked questions
- What is CVE-2017-9803?
- CVE-2017-9803 is a high-severity vulnerability in Apache Solr, classified under Improper Authentication. CVSS score: 7.5/10. Published 2017-09-18.
- How severe is CVE-2017-9803?
- High severity. CVSS v3 base score is 7.5 out of 10.