HPSBGN03117 rev.2 - HP Remote Device Access: Virtual Customer Access System (vCAS) running Bash Shell, Remote Code Execution

  • KM02993347
  • 19-Oct-2017
  • 19-Oct-2017

Summary

A potential security vulnerability has been identified with HP Remote Device Access: Virtual Customer Access System (vCAS) running Bash Shell. This is the Bash Shell vulnerability known as "ShellShock" which could be exploited remotely to allow execution of code. NOTE: The vCAS product is vulnerable only if DHCP is enabled.

Reference

SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: KM02993347 (c04467807)

Version: 2

HPSBGN03117 rev.2 - HP Remote Device Access: Virtual Customer Access System (vCAS) running Bash Shell, Remote Code Execution
NOTICE: The information in this Security Bulletin should be acted upon as soon as possible.

Release Date: 2014-09-30

Last Updated: 2014-11-11


Potential Security Impact: Remote code execution

Source: Hewlett-Packard Company, HP Software Security Response Team

VULNERABILITY SUMMARY

A potential security vulnerability has been identified with HP Remote Device Access: Virtual Customer Access System (vCAS) running Bash Shell. This is the Bash Shell vulnerability known as "ShellShock" which could be exploited remotely to allow execution of code.

NOTE: The vCAS product is vulnerable only if DHCP is enabled.
References:
  • CVE-2014-6271
  • CVE-2014-7169
  • SSRT101724

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.

  • All vCAS versions prior to 14.10-38402

BACKGROUND

For a PGP signed version of this security bulletin please write to: security-alert@hp.com

CVSS 2.0 Base Metrics
Reference
Base Vector
Base Score
CVE-2014-6271
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
10.0
CVE-2014-7169
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
10.0
Information on CVSS is documented in HP Customer Notice: HPSN-2008-002

RESOLUTION

HP has made the following updates available to resolve the vulnerability in HP Remote Device Access: Virtual Customer Access System (vCAS) running Bash Shell.

Customers should upgrade their vCAS systems using the web UI or the "casupdate" command.

There are also new VirtualBox and VMware ESX images available:
NOTE:
  • HP recommends to not power-down or disconnect the vCAS until the update is available.
  • The vCAS pulls down the latest updates from HP by usingUbuntu’s apt-get facility.
  • HP does not push updates out on to the vCAS so customers will have to be proactive and install the latest updates.

Actions Required

  • The DHCP exploit can be mitigated by ensuring that DHCP is disabled on the vCAS as detailed in MITIGATION INFORMATION below.
  • Download updates by using a web browser:
    1. Connect to the vCAS and login as hp-admin
    2. Go to Tools -> Software Updates
    3. Under "Manual Actions" select “Check now” and then “upgrade now”

    See HP Remote Device Access vCAS User Guide, Chapter 4, Software Updates for more details.

MITIGATION INFORMATION

A Shellshock attack requires the definition of an environment variable introduced into Bash. The vCAS has three attack vectors: SSH, the lighttpd web server, and the DHCP client.
  • The exploit does not elevate privileges.
  • The SSH and webserver exploits require vCAS credentials so there is no risk for unauthorized access or code execution through this vulnerability.

The DHCP client uses Bash scripts and is vulnerable to Shellshock. The DHCP exploit can be mitigated by ensuring that DHCP is disabled on the vCAS.

Note: HP strongly discourages the use of DHCP on the vCAS.

The web UI forces the vCAS user to assign a static IP address and change the hp-admin password. A vCAS user must manually configure DHCP for use on the vCAS.

A vCAS user can verify that DHCP is disabled by inspecting the file "/etc/network/interfaces" and ensuring that the "iface" line for device "eth0" is set for a static IP.

Example of a static IP configuration:

# The primary network interface 
auto eth0 
iface eth0 inet static 
address 172.27.1.68 
netmask 255.255.255.0 
gateway 172.27.1.1

HISTORY 
Version:1 (rev.1) - 30 September 2014 Initial release 
Version:2 (rev.2) - 11 November 2014 Software updates available

Third Party Security Patches: Third party security patches that are to be installed on systems running HP software products should be applied in accordance with the customer's patch management policy.

Support: For issues about implementing the recommendations of this Security Bulletin, contact normal HP Services support channel. For other issues about the content of this Security Bulletin, send e-mail to security-alert@hp.com.

Report: To report a potential security vulnerability with any HP supported product, send Email to: security-alert@hp.com

Subscribe: To initiate a subscription to receive future HP Security Bulletin alerts via Email:http://h41183.www4.hp.com/signup_alerts.php?jumpid=hpsc_secbulletins

Security Bulletin Archive: A list of recently released Security Bulletins is available here:https://h20564.www2.hp.com/portal/site/hpsc/public/kb/secBullArchive

Software Product Category: The Software Product Category is represented in the title by the two characters following HPSB.

3C = 3COM 
3P = 3rd Party Software 
GN = HP General Software 
HF = HP Hardware and Firmware 
MP = MPE/iX 
MU = Multi-Platform Software 
NS = NonStop Servers 
OV = OpenVMS 
PI = Printing and Imaging 
PV = ProCurve 
ST = Storage Software 
TU = Tru64 UNIX 
UX = HP-UX

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