Security Bulletin: Vulnerabilities in GNU Bash affect the IBM FlashSystem models 840 and 900

Summary

There are vulnerabilities in GNU Bash to which the IBM FlashSystem™ 840 and FlashSystem 900 are susceptible. An exploit of these vulnerabilities (CVE-2016-0634, CVE-2016-7543, CVE-2016-9401) could make the system susceptible to an attack which could allow an attacker to execute arbitrary code and commands on the system or bypass the restricted shell.

Vulnerability Details

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)

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-2016-9401 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)

Affected Products and Versions

FlashSystem 840 machine type and models (MTMs) affected include 9840-AE1 and 9843-AE1.
FlashSystem 900 MTMs affected include 9840-AE2 and 9843-AE2.

Supported code versions which are affected
· VRMFs prior to 1.3.0.9
· VRMFs prior to 1.4.8.0

Remediation/Fixes

MTMs

| VRMF| APAR| Remediation/First Fix
—|—|—|—
FlashSystem****840 MTM:
9840-AE1 &9843-AE1

**FlashSystem 900 MTMs:**9840-AE2 &9843-AE2| Code fixes are now available, the minimum VRMF containing the fix depends on the code stream:_ _
__Fixed Code VRMF __
1.5 stream: 1.5.0.0
_1.4 stream: 1.4.8.0 _
1.3 stream: 1.3.0.9| _ N/A| FlashSystem 840 fixes****and FlashSystem 900 fixes****are available @ IBM’s Fix Central _

Workarounds and Mitigations

None