[security bulletin] HPSBGN03117 rev.1 - HP Remote Device Access: Virtual Customer Access System (vCAS) running Bash Shell, Remote Code Execution

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SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: c04467807
Version: 1

HPSBGN03117 rev.1 - 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: 2014-09-30

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.

vCAS version 14.06 (RDA 8.1)

BACKGROUND

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 is actively working to address this vulnerability for the impacted product
versions of HP Remote Device Access: Virtual Customer Access System (vCAS)
running Bash Shell. This bulletin will be revised when the software update is
released.

NOTE: HP recommends to not power-down or disconnect the vCAS until the update
is available.

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

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

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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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