Security Bulletin: IBM Dynamic System Analysis (DSA) Preboot is affected by vulnerabilities in bash (CVE-2014-6277 CVE-2014-6278 CVE-2016-0634 CVE-2016-7543)

Summary

IBM Dynamic System Analysis (DSA) Preboot has addressed the following vulnerabilities in bash.

Vulnerability Details

Summary

IBM Dynamic System Analysis (DSA) Preboot has addressed the following vulnerabilities in bash.

Vulnerability Details

CVEID: 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
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/96686&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVEID: 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
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/96687&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVEID: CVE-2016-0634

Description: GNU Bash could allow a local attacker to execute arbitrary code on the system, caused by an error related to the expansion of the $HOSTNAME. By injecting the hostname with malicious code, an attacker could exploit this vulnerability to execute arbitrary code on the system.

CVSS Base Score: 4.9
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/121373&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)

CVEID: CVE-2016-7543

Description: GNU Bash could allow a local attacker to execute arbitrary commands on the system. An attacker could exploit this vulnerability using specially crafted SHELLOPTS and PS4 variables to execute arbitrary commands on the system with root privileges.

CVSS Base Score: 8.4
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/121372&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected products and versions

Remediation/Fixes

Firmware fix versions are available on Fix Central: <http://www.ibm.com/support/fixcentral/&gt;

Workarounds and Mitigations

None.

References

• Complete CVSS V2 Guide
• On-line Calculator V2
• Complete CVSS V3 Guide
• On-line Calculator V3

Related Information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Lenovo Product Security Advisories

Acknowledgement

None.

Change History
21 November, 2017: 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

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an “industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response.” IBM PROVIDES THE CVSS SCORES “AS IS” WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.