Security Bulletin: Multiple Vulnerabilities in the Linux kernel affect the IBM FlashSystem 840 and 900

Security Bulletin

Summary

There are vulnerabilities in the Linux kernel to which the IBM FlashSystem™ 840 and FlashSystem 900 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 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

FlashSystem 840 machine type and models (MTMs) affected include 9840-AE1 and 9843-AE1.
FlashSystem 900 MTMs affected include 9843-UF3, 9840-AE2, 9843-AE2, 9840-AE3, and 9843-AE3.

Supported code versions which are affected

VRMFs prior to 1.4.8.2
VRMFs prior to 1.5.2.5
VRMFs prior to 1.6.1.0

Remediation/Fixes

MTMs	VRMF	APAR	Remediation/First Fix
FlashSystem840 MTM: 9840-AE1 &9843-AE1 FlashSystem 900 MTMs:9843-UF3, 9840-AE2, 9843-AE2, 9840-AE3, & 9843-AE3	Code fixes are now available, the minimum VRMF containing the fix depends on the code stream: Fixed Code VRMF 1.6 stream: 1.6.1.0 1.5 stream: 1.5.2.5 1.4 stream: 1.4.8.2	N/A	FlashSystem 840 fixesand FlashSystem 900 fixes are available @ IBM’s Fix Central

Workarounds and Mitigations

Upgrade to a remediated code level.

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References

Complete CVSS v3 Guide
On-line Calculator v3

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Acknowledgement

None.

Change History

28 June 2019 Original Version Published

*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.

Internal Use Only

Adv. 12141

Document Location

Worldwide

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Security Bulletin: Multiple Vulnerabilities in the Linux kernel affect the IBM FlashSystem 840 and 900