VAR-201409-1154

Vulnerability from variot - Updated: 2025-11-26 21:38

GNU Bash through 4.3 bash43-026 does not properly parse function definitions in the values of environment variables, which allows remote attackers to execute arbitrary commands via a crafted environment, as demonstrated by vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server, scripts executed by unspecified DHCP clients, and other situations in which setting the environment occurs across a privilege boundary from Bash execution. NOTE: this vulnerability exists because of an incomplete fix for CVE-2014-6271, CVE-2014-7169, and CVE-2014-6277. GNU Bash is prone to remote code execution vulnerability. An attacker can exploit this issue to execute arbitrary code within the context of the affected application. Failed exploit attempts will result in a denial-of-service condition.

Note: HP and the switch vendor recommend running an active version of Fabric OS (FOS) listed on the HP Single Point of Connectivity Knowledge (SPOCK) website ( http://h20272.www2.hp.com/ ) and applying the work-around information provided in the MITIGATION INFORMATION section below to protect HP StoreFabric B-series switches from this vulnerability. - Utilize FOS password policy management to strengthen the complexity, age, and history requirements of switch account passwords. This bulletin will be revised when the update is available.

MITIGATION INFORMATION

HP recommends the following steps to reduce the risk of this

vulnerability:

  - Place the HP StoreFabric H-series switch and other data center

critical infrastructure behind a firewall to disallow access from the Internet. - Change all HP StoreFabric switch default account passwords, including the root passwords, from the default factory passwords. - Examine the list of accounts, including ones on the switch and those existing on remote authentication servers such as RADIUS, LDAP, and TACAS+, to ensure only necessary personnel can gain access to HP StoreFabric H-series switches. Delete guest accounts and temporary accounts created for one-time usage needs. - To avoid possible exploit through the embedded web GUI, QuickTools, disable the web server with the following procedure:

    NOTE: After completing this procedure, the user will not be able to

manage the switch using QuickTools. Login to the Command Line Interface (CLI). Execute the "admin start" command to enter into an admin session. Execute the "set setup services" command and change setting for EmbeddedGUIEnabled to "False". No other firmware stream updates are planned beyond the NX-OS 5.x and 6.x versions listed below for the MDS products. This software versions 6.2(9a) has included the fixes for the vulnerability in HP StoreFabric C-series MDS switches which currently supporting NX-OS 6.X releases. This software version 5.2(8e) has included the fix for the vulnerability in HP C-series MDS switches which currently supporting NX-OS 5.X releases. All MDS and Nexus 5K switches can function in this configuration. Access is available through the console port. Note: All versions of HP Thin Pro and HP Smart Zero Core operating systems prior to version 5.1.0 are affected by these vulnerabilities. Following is a complete list of affected operating systems and Hardware Platforms Affected.

HP ThinPro:

HP ThinPro 5.0 (released June 2014) HP ThinPro 4.4 (released November 2013) HP ThinPro 4.3 (released June 2013) HP ThinPro 4.2 (released November 2012) HP ThinPro 4.1 (released March 2012) HP ThinPro 3.2 (released November 2010) HP ThinPro 3.1 (released June 2010) HP ThinPro 3.0 (released November 2009) HP ThinPro 2.0 (released 2009) HP ThinPro 1.5 (released 2009) HP ThinPro 1.0 (released 2008)

HP Smart Zero Core:

HP Smart Zero Core 5.0 (released June 2014) HP Smart Zero Core 4.4 (released November 2013) HP Smart Zero Core 4.3 (released June 2013) HP Smart Zero Core 4.2 (released November 2012) HP Smart Zero Core 4.1 (released March 2012) HP Smart Zero Core 4.0 (released March 2011)

Hardware Platforms Affected:

HP t620 PLUS Flexible Quad Core Thin Client HP t620 Flexible Dual Core Thin Client HP t620 PLUS Flexible Dual Core Thin Client HP t620 Flexible Quad Core Thin Client HP t520 Flexible Thin Client HP t505 Flexible Thin Client HP t510 Flexible Thin Client HP t410 All-in-One 18.5 RFX/HDX Smart ZC HP t410 Smart Zero Client HP t610 PLUS Flexible Thin Client HP t610 Flexible Thin Client HP t5565 Thin Client HP t5565z Smart Client

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 CVE-2104-6277 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10 CVE-2104-6278 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10 CVE-2014-7169 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10 CVE-2014-7186 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10 CVE-2014-7187 (AV:N/AC:L/Au:N/C:C/I:C/A:C) 10 =========================================================== Information on CVSS is documented in HP Customer Notice: HPSN-2008-002

RESOLUTION

HP has released the following software updates to resolve these vulnerabilities.

Product Affected Product Versions Patch Status

HP ThinPro and HP Smart Zero Core (X86) v5.1.0 and above No update required; the Bash shell patch is incorporated into the base image.

Note: If you participated in the ThinPro 5.1.0 beta program then upgrade to the release version as soon as it becomes available.

HP ThinPro and HP Smart Zero Core (x86) v5.0.x A component update is currently available through Easy Update as: SecurityUpdate-Shellshock-2.0-all-5.0-x86.xar .