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

Summary

There are vulnerabilities in OpenSSH to which the IBM® FlashSystem™ 840 and FlashSystem 900 are susceptible. An exploit of these vulnerabilities (CVE-2015-6563 and CVE-2015-6564) could allow a remote attacker to bypass security restrictions to gain elevated privileges or conduct an impersonation attack.

Vulnerability Details

CVEID: CVE-2015-6563 DESCRIPTION: OpenSSH could allow a local attacker to bypass security restrictions, caused by the acceptance of extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests by the monitor component in sshd. An attacker could exploit this vulnerability to conduct impersonation attacks.
CVSS Base Score: 4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/105881 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-2015-6564 DESCRIPTION: OpenSSH could allow a local attacker to gain elevated privileges on the system, caused by a use-after-free error in the mm_answer_pam_free_ctx function. An attacker could exploit this vulnerability to gain elevated privileges on the system.
CVSS Base Score: 7.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/105882 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

· FlashSystem 840 affected Machine Type Models (MTMs) include:
o 9840-AE1 and 9843-AE1

· FlashSystem 900 affected MTMs include:
o 9840-AE2 and 9843-AE2

· Code versions affected, for both FlashSystem 840 & 900, include supported VRMFs:
o 1.3.0.0 – 1.3.0.6

· Code streams NOT affected:
o 1.4 stream was NOT affected

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 __
1.3 stream: 1.3.0.7| _ _N/A| FlashSystem 840 fixes****and FlashSystem 900 fixes****are available @ IBM’s Fix Central

Workarounds and Mitigations

None