CVE-2018-16620 Nexus Repository Manager (Missing Access Controls) - October 17, 2018

Sonatype Nexus Repository Manager 3 Security Advisory

Date:  October 17, 2018

Affected Versions:  All previous Nexus Repository Manager 3 OSS/Pro versions up to and including 3.13.0

Fixed in Version:  Nexus Repository Manager OSS/Pro version 3.14.0

Summary:

Insufficient access controls have been discovered in Nexus Repository Manager 3.

An unauthenticated user can craft requests in such a manner that the responses can reveal other hosts and which ports they have open on the local network. We have mitigated the issue by adding the necessary access controls.  This advisory provides the pertinent information needed to properly address this vulnerability, along with the details on how to reach us if you have any further questions or concerns.

This vulnerability was identified by external researchers and has been verified by our security team. We are not aware of any active exploits taking advantage of this issue. However, we strongly encourage all users of Nexus to immediately take the steps outlined in this advisory.

The identified vulnerability allows an attacker to map the internal network.  We are highly recommending all instances of Nexus be upgraded to Nexus 3.14 or later.

Publicly available Nexus Repository Manager instances are at greater risk and we have taken steps to mitigate this vulnerability in known public forge instances as well as providing remediation guidance to the overall Nexus Repository Manager user community.

The vulnerability associated with this advisory is fixed in Nexus 3.14 and above. The latest version of NXRM 3.x can be downloaded from:

https://help.sonatype.com/repomanager3/download

For detailed information on upgrade compatibility, please see:

https://support.sonatype.com/hc/en-us/articles/115000350007

Credit:

Sonatype thanks Dominik Schneider and Till Osswald, ERNW GmbH for responsibly reporting the identified issues and working with us as we addressed them.

Support:

If you run into any problems, or have any questions/concerns, please contact us by filing a ticket at https://support.sonatype.com.

Frequently Asked Questions:

Q:  What is the risk associated with this vulnerability?

A:  An attacker can map the internal network affecting the confidentiality of the internal infrastructure.  

 

Q: What preconditions must be met in order to be vulnerable?

A: None. Any unauthenticated user can exploit this vulnerability.

 

Q: Are there implications associated with this advisory itself?

A: Disclosure unfortunately means bad actors may try to take advantage.  While we have initially limited the information to the minimum details necessary for users to affect an appropriate fix, this merely slows down a would be attacker.  As such, we are advising all organizations utilizing Nexus Repository Manager to immediately assess their individual impact and take appropriate action in response.

 

Q:  Where can I obtain more information associated with the vulnerability?

A:  At this time, and in the interest of best protecting our user community, we are limiting the information released to that absolutely required in order to assess impact and affect remediation. Please contact support for more information.

 

Q:  Why is Sonatype making this information available?

A:  This is part of a responsible disclosure process.  Given Nexus Repository Manager is an open source project with over 150,000 active server installations, notifying the user base will invariably lead to broad dissemination.  We are taking a concerted and proactive approach in our outreach activities and an effort to achieve the most rapid remediation possible.

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