CVE-2016-5709 - Use of Weak Encryption Algorithm in Solarwinds Virtualization Manager

[Nate Kettlewell <nate () depthsecurity com>]

Product: Solarwinds Virtualization Manager

Vendor: Solarwinds
Vulnerable Version(s): < 6.3.1
Tested Version: 6.3.1

Vendor Notification: April 25th, 2016
Vendor Patch Availability to Customers: June 1st, 2016
Public Disclosure: June 14th, 2016

Vulnerability Type: Security Misconfiguration
CVE Reference: CVE-2016-5709
Risk Level: High
CVSSv3 Base Score: 6.0 (CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N)
Solution Status: Solution Available

Discovered and Provided: Nate Kettlewell, Depth Security ( https://www.depthsecurity.com/ )

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Advisory Details:

Depth Security discovered a vulnerability in Solarwinds Virtualization Manager appliance. 
This attack requires a user to have an operating system shell with superuser privilges on the vulnerable appliance.

1) Use of a weak encryption algorithm in Solarwinds Virtualization Manager: CVE-2016-5709

The vulnerability exists due to the use of a weak encryption algorithm in the /etc/shadow file.
A local attacker in possession of a superuser operating system shell can easily crack the passwords of other system 
users.

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Solution:

Solarwinds has released a hotfix to remediate this vulnerability on existing installations. 

This flaw as well as several others have been corrected and that release has been put into manufacturing for new 
appliances.

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Proof of Concept:

An attacker can dump the contents of the /etc/shadow file using the following command:

cat /etc/passwd

The output of this command can then be used with many popular password cracking programs to obtain the cleartext 
passwords of other operating system users.

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References:

[1] Solarwinds Virtualization Manager- http://www.solarwinds.com/virtualization-manager - Solarwinds Virtualization 
Manager provides monitoring and remediation for virtualized environments.

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