Security Bulletin: A vulnerability in Samba affects IBM Spectrum Scale SMB protocol access method (CVE-2019-3880)

Summary

A Samba vulnerability affects IBM Spectrum Scale SMB protocol access method that could allow a remote authenticated attacker to traverse a symbolic link on the system and write files outside the SMB share.

Vulnerability Details

This vulnerability only affects systems having SMB1 and Unix-Extensions enabled. By default in Spectrum Scale these are not enabled and supported.

CVEID: CVE-2019-3880 DESCRIPTION: Samba could allow a remote authenticated attacker to traverse directories on the system. An attacker could send a specially-crafted “winreg_SaveKey” request to create a new registry hive file outside a Samba share.
CVSS Base Score: 6.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/159188&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)

Affected Products and Versions

IBM Spectrum Scale V5.0.0.0 thru V5.0.3.0

IBM Spectrum Scale V4.2.0.0 thru V4.2.3.14

IBM Spectrum Scale V4.1.0.0 thru V4.1.1.22

Remediation/Fixes

For IBM Spectrum Scale V5.0.0.0 thru V5.0.3.0, apply V5.0.3.1 available from FixCentral at
https://www-945.ibm.com/support/fixcentral/swg/selectFixes?parent=Software%20defined%20storage&product=ibm/StorageSoftware/IBM+Spectrum+Scale&release=5.0.2&platform=All&function=all

For IBM Spectrum Scale V4.2.0.0 thru V4.2.3.14, apply V4.2.3.15 available from FixCentral at
https://www-945.ibm.com/support/fixcentral/swg/selectFixes?parent=Software%20defined%20storage&product=ibm/StorageSoftware/IBM+Spectrum+Scale&release=4.2.3&platform=All&function=all

For IBM Spectrum Scale V4.1.0.0 (GPFS) thru V4.1.1.22, apply V4.1.1.23 available from FixCentral at
https://www-945.ibm.com/support/fixcentral/swg/selectFixes?parent=Software%2Bdefined%2Bstorage&product=ibm/StorageSoftware/IBM+Spectrum+Scale&release=4.1.1&platform=All&function=all

If you cannot apply the latest level of service, contact IBM Service for an efix

• IBM Specrum Scale V5.0.0.0 thru V5.0.3.0, reference APAR ** IJ16214** * IBM Spectrum Scale 4.2.0.0 thru 4.2.3.14, reference APARIJ16213

To contact IBM Service, see http://www.ibm.com/planetwide/

Workarounds and Mitigations

None