Security Bulletin: Multiple vulnerabilities in the Linux kernel affect IBM SAN Volume Controller, IBM Storwize, IBM Spectrum Virtualize and IBM FlashSystem products

Security Bulletin

Summary

Vulnerabilities in the Linux Kernel affect IBM SAN Volume Controller, IBM Storwize V7000, V5000, V3700 and V3500, IBM Spectrum Virtualize Software, IBM Spectrum Virtualize for Public Cloud and IBM FlashSystem V9000 and 9100 family products. The applicable CVEs are CVE-2017-18017 and CVE-2017-17449.

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 condition.
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

IBM SAN Volume Controller
IBM Storwize V7000
IBM Storwize V5000
IBM Storwize V3700
IBM Storwize V3500
IBM FlashSystem V9000
IBM FlashSystem 9100 Family
IBM Spectrum Virtualize Software
IBM Spectrum Virtualize for Public Cloud

All products are affected when running supported versions 7.6.1 to 8.2.

Remediation/Fixes

IBM recommends that you fix this vulnerability by upgrading affected versions of IBM SAN Volume Controller, IBM Storwize V7000, V5000, V3700 and V3500, IBM FlashSystem V9000, IBM Spectrum Virtualize Software, and IBM Spectrum Virtualize for Public Cloud to the following code levels or higher:

7.8.1.8

8.1.3.3

8.2.0.0

8.2.1.0

Latest IBM SAN Volume Controller Code
Latest IBM Storwize V7000 Code
Latest IBM Storwize V5000 Code
Latest IBM Storwize V3700 Code
Latest IBM Storwize V3500 Code
Latest IBM FlashSystem V9000 Code
Latest IBM FlashSystem 9100 Family Code
Latest IBM Spectrum Virtualize Software
Latest IBM Spectrum Virtualize for Public Cloud

For unsupported versions of the above products, IBM recommends upgrading to a fixed, supported version of code.

Workarounds and Mitigations

Although IBM recommends that you install a level of code with a fix for this vulnerability, you can mitigate, although not eliminate, your risk until you have done so by ensuring that all users who have access to the system are authenticated by another security system such as a firewall.

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References

Complete CVSS v3 Guide
On-line Calculator v3

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*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

Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.

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Tips

Security Bulletin: Multiple vulnerabilities in the Linux kernel affect IBM SAN Volume Controller, IBM Storwize, IBM Spectrum Virtualize and IBM FlashSystem products