---
title: "CVE-2017-9803\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2017-9803?format=md
keywords: index, follow
---

# CVE-2017-9803

Publication date 18 September 2017

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2017-9803?format=md#impact-score)

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## Description

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.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2017-9803?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| lucene-solr | 17.04 zesty | Not affected |
| 16.04 LTS xenial | Not affected |
| 14.04 LTS trusty | Not affected |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Notes

---

### [mdeslaur](https://launchpad.net/~mdeslaur)

introduced in 6.2

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | High |
  | Privileges required | Low |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | High |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9803)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2017-9803)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2017-9803)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2017-9803)

### Other references

* <http://mail-archives.us.apache.org/mod_mbox/www-announce/201709.mbox/%3CCAOOKt53AOScg04zUh0%2BR_fcXD0C9s5mQ-OzdgYdnHz49u1KmXw@mail.gmail.com%3E>
* <https://www.cve.org/CVERecord?id=CVE-2017-9803>