Security Bulletin: Vulnerabilities in Bash affect certain IBM N Series products (CVE-2014-6271, CVE-2014-7169, CVE-2014-7186, CVE-2014-7187, CVE-2014-6277, CVE-2014-6278)

Summary

Six Bash vulnerabilities were disclosed in September 2014. This bulletin addresses the vulnerabilities that have been referred to as “Bash Bug” or “Shellshock” and two memory corruption vulnerabilities. Bash is used by IBM N Series products using certain versions of the following: Data ONTAP operating in 7-mode, Clustered Data ONTAP, and OnCommand Unified Manager for Clustered Data ONTAP.

Vulnerability Details

CVE-ID: CVE-2014-6271; DESCRIPTION: GNU Bash could allow a remote attacker to execute arbitrary commands on the system, caused by an error when evaluating specially-crafted environment variables passed to it by the bash functionality. An attacker could exploit this vulnerability to write to files and execute arbitrary commands on the system.
CVSS Base Score: 10.0CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96153 for the current scoreCVSS Environmental Score*: UndefinedCVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)CVE-ID: CVE-2014-7169

DESCRIPTION: GNU Bash could allow a remote attacker to execute arbitrary commands on the system, caused by an incomplete fix related to malformed function definitions in the values of environment variables. An attacker could exploit this vulnerability using attack vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server to write to files and execute arbitrary commands on the system.

CVSS Base Score: 10.0CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96209 for the current scoreCVSS Environmental Score*: UndefinedCVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVE-ID: CVE-2014-7186

DESCRIPTION: GNU Bash could allow a local attacker to execute arbitrary code on the system, caused by an out-of-bounds memory access while handling redir_stack. An attacker could exploit this vulnerability to execute arbitrary code on the system or cause a denial of service.

CVSS Base Score: 10.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96237 for the current scoreCVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVE-ID: CVE-2014-7187

DESCRIPTION: GNU Bash could allow a local attacker to execute arbitrary code on the system, caused by an off-by-one-error when handling deeply nested flow control constructs. An attacker could exploit this vulnerability to execute arbitrary code on the system or cause a denial of service.

CVSS Base Score: 10.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96238 for the current scoreCVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVE-ID: CVE-2014-6277

DESCRIPTION: GNU Bash could allow a remote attacker to execute arbitrary code on the system, caused by an incomplete fix related to the failure to properly parse function definitions in the values of environment variables. An attacker could exploit this vulnerability using attack vectors involving the ForceCommand feature in OpenSSH sshd, the mod_cgi and mod_cgid modules in the Apache HTTP Server to execute arbitrary code on the system or cause a denial of service.

CVSS Base Score: 10.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96686 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVE-ID: CVE-2014-6278

DESCRIPTION: GNU Bash could allow a remote attacker to execute arbitrary code on the system, caused by an incomplete fix related to the parsing of user scripts. An attacker could exploit this vulnerability to execute arbitrary code on the system or cause a denial of service.

CVSS Base Score: 10.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96687 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

Affected Products and Versions

· IBM N Series products containing - Data ONTAP for 7-Mode
Versions 8.1, 8.2
· IBM N Series products containing - Clustered Data ONTAP
Versions 8.1, 8.2
· IBM N Series products containing- OnCommand Unified Manager for Clustered Data ONTAP
Versions 6.1

Remediation/Fixes

Product

| VRMF| APAR| Remediation/First Fix
—|—|—|—
N Series Data ONTAP for 7-Mode| 8.1, 8.2|
| Install version 8.1.4P6 or 8.2.2P1

8.1.4P6 https://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=nseriesnetapp

8.2.2P1
Contact IBM Support
800 IBM-SERV
to obtain the code and documentation
N Series Clustered Data ONTAP| 8.1, 8.2, |
| Install version 8.1.4P6 or 8.2.2P1

Contact IBM Support
800 IBM-SERV
to obtain the code and documentation
OnCommand Unified Manager for Clustered Data ONTAP| 6.1|
| Install version 6.1R1

Contact IBM Support
800 IBM-SERV
to obtain the code and documentation

Workarounds and Mitigations

Although IBM recommends that you upgrade to the fixes identified above, you can mitigate the risk from Bash for Data ONTAP for 7-Mode and Clustered Data ONTAP (although not eliminate it), by disabling the diagnostic account. Steps below indicate how to lock the ‘diag’ user and disable the diagnostic account.

· The command to disable the diag account for Data ONTAP for 7-Mode is: priv set advanced; useradmin diaguser lock

· The command to disable the diag account for Clustered Data ONTAP is: security login lock diag