Security Bulletin: Vulnerabilities in GNU Bash affect PowerKVM

Summary

PowerKVM is affected by vulnerabilities in GNU Bash. IBM has now addressed these vulnerabilities.

Vulnerability Details

CVEID: CVE-2016-9401**
DESCRIPTION:** GNU Bash could allow a local attacker to bypass security restrictions, caused by a use-after-free error. An attacker could exploit this vulnerability using a specially crafted address to bypass the restricted shell.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/122314 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)

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 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)

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 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)

Affected Products and Versions

PowerKVM 2.1 and 3.1

Remediation/Fixes

Customers can update PowerKVM systems by using “yum update”.

Fix images are made available via Fix Central. For version 3.1, see https://ibm.biz/BdHggw. This issue is addressed starting with v3.1.0.2 update 10.

For version 2.1, see https://ibm.biz/BdEnT8. This issue is addressed starting with PowerKVM 2.1.1.3-65 update 19. Customers running v2.1 are, in any case, encouraged to upgrade to v3.1.

For v2.1 systems currently running fix levels of PowerKVM prior to 2.1.1, please see <http://download4.boulder.ibm.com/sar/CMA/OSA/05e4c/0/README&gt; for prerequisite fixes and instructions.

Workarounds and Mitigations

none