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             AUSCERT External Security Bulletin Redistribution

        Multiple Vulnerabilities in the Linux kernel affect the IBM
                     FlashSystem models V840 and V9000
                               5 August 2019


        AusCERT Security Bulletin Summary

Product:           IBM FlashSystem V840
Publisher:         IBM
Operating System:  Network Appliance
Impact/Access:     Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Existing Account      
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-18017 CVE-2017-17449 

Reference:         ESB-2019.1089

Original Bulletin: 

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Multiple Vulnerabilities in the Linux kernel affect the IBM FlashSystem models
V840 and V9000

Product:             IBM FlashSystem V840
Operating system(s): Platform Independent
Reference #:         0957179

Security Bulletin


There are vulnerabilities in Java to which the IBM FlashSystem V840 and
FlashSystem V9000 are susceptible (CVE-2017-18017 and CVE-2017-17449). An
exploit of CVE-2017-18017 could allow a remote attacker to cause a denial of
service condition. An exploit of CVE-2017-17449 could allow an attacker to
obtain sensitive information.

Vulnerability Details

CVEID: CVE-2017-18017
DESCRIPTION: Linux Kernel is vulnerable to a denial of service, caused by a
use-after-free flaw in the tcpmss_mangle_packet function in net/netfilter/
xt_TCPMSS.c. By leveraging the presence of xt_TCPMSS in an iptables action, a
remote attacker could exploit this vulnerability to cause a denial of service
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
137122 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

CVEID: CVE-2017-17449
DESCRIPTION: Linux Kernel could allow a local attacker to obtain sensitive
information, caused by the failure to restrict observations of Netlink messages
to a single net namespace when CONFIG_NLMON is enabled in the
__netlink_deliver_tap_skb function in net/netlink/af_netlink.c. By leveraging
the CAP_NET_ADMIN capability to sniff an nlmon interface for all Netlink
activity on the system, an attacker could exploit this vulnerability to obtain
sensitive information.
CVSS Base Score: 6.2
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/
136106 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:N/A:N)

Affected Products and Versions

Storage Node machine type and models (MTMs) affected:

  o 9846-AE1 and 9848-AE1
  o 9846-AE2 and 9848-AE2
  o 9846-AE3 and 9848-AE3

Controller Node MTMs affected:

  o 9846-AC0 and9848-AC0
  o 9846-AC1 and 9848-AC1
  o 9846-AC2 and 9848-AC2
  o 9846-AC3 and 9848-AC3

Supported storage node code versions which are affected

  o VRMFs prior to
  o VRMFs prior to
  o VRMFs prior to

Supported controller node code versions which are affected
. VRMFs prior to
. VRMFs prior to
. VRMFs prior to


|                    |                                    |        |                         |
| MTMs               |                VRMF                | APAR   | Remediation/First Fix   |
|                    |                                    |        |                         |
|                    |                                    |        |                         |
| Storage nodes:     |                                    |        |                         |
| 9846-AE1,9848-AE1, | Code fixes are now available, the  |        |                         |
| 9846-AE2,          | minimum VRMF containing the fix    |        |                         |
| 9848-AE2,          | depends on the code stream:        |        |                         |
| 9846-AE3, &        |                                    |        |                         |
| 9848-AE3           | Fixed Code VRMF                    |        | FlashSystem V840 fixes  |
|                    | 1.6 stream:                |        | or FlashSystem V9000    |
| Controller nodes:  | 1.5 stream:                | N/A    | fixes for storage and   |
| 9846-AC0,          | 1.4 stream:                |        | controller node are     |
| 9846-AC1,          |                                    |        | available @ IBM's Fix   |
| 9848-AC0,          | Controller Node VRMF               |        | Central                 |
| 9848-AC1,          | 8.2 stream:                |        |                         |
| 9846-AC2,          | 8.1 stream:                |        |                         |
| 9848-AC2,          | 7.8 stream:                |        |                         |
| 9846-AC3, &        |                                    |        |                         |
| 9848-AC3           |                                    |        |                         |
|                    |                                    |        |                         |

Workarounds and Mitigations

Upgrade to a remediated code level.



Change History

28 June 2019 Original Version Published

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