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

[Nate Kettlewell <nate@xxxxxxxxxxxxxxxxx>]

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/ )

-----------------------------------------------------------------------------------------------

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.

-----------------------------------------------------------------------------------------------

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.

-----------------------------------------------------------------------------------------------

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.

-----------------------------------------------------------------------------------------------

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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