Security Bulletin: Vulnerabilities in Bash affect IBM SDN VE (CVE-2014-6271, CVE-2014-7169, CVE-2014-7186, CVE-2014-7187, CVE-2014-6277, CVE-2014-6278)

Security Bulletin

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 SDN VE.

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: 10.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96153 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-2014-7169
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: 10.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96209 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-2014-7186
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: 4.6
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96237 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P)

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: 4.6
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/96238 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:L/AC:L/Au:N/C:P/I:P/A:P)

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 SDN VE, Unified Controller, VMware Edition: 1.2.0 and earlier
IBM SDN VE, Unified Controller, KVM Edition: 1.2.0 and earlier
IBM SDN VE, Unified Controller, OpenFlow Edition: 1.2.0 and earlier
IBM SDN VE, Dove Management Console, VMware Edition: 1.0.0
IBM SDN VE, Service Appliance, VMware Edition: 1.2.0 and earlier
IBM SDN VE, Service Appliance, KVM Edition: 1.2.0 and earlier

Remediation/Fixes

IBM recommends updating affected IBM SDN VE, Unified Controllers and IBM SDN
VE, Service Appliances to the latest versions of IBM SDN VE for which IBM is
providing a fix, which are identified below:
IBM SDN VE, Unified Controller, VMware Edition: version 1.2.1 or later
IBM SDN VE, Unified Controller, KVM Edition: version 1.2.1 or later
IBM SDN VE, Unified Controller, OpenFlow Edition: version 1.2.1 or later
IBM SDN VE, Service Appliance, VMware Edition: version 1.2.1 or later
IBM SDN VE, Service Appliance, KVM Edition: version 1.2.1 or later

These versions are available via Passport Advantage.

Workarounds and Mitigations

None known

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References

Complete CVSS v2 Guide
On-line Calculator v2

Off

Acknowledgement

None

Change History

09 October 2014: Original Version Published

*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

SDN-VE-Bash Security Bulletin contains 6 CVEs.pdf

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Tips

Security Bulletin: Vulnerabilities in Bash affect IBM SDN VE (CVE-2014-6271,
CVE-2014-7169, CVE-2014-7186, CVE-2014-7187, CVE-2014-6277, CVE-2014-6278)