Security Bulletin: A vulnerability in Samba affects IBM Spectrum Scale SMB protocol access method (CVE-2017-9461)

Summary

A Samba vulnerability affects IBM Spectrum Scale SMB protocol access method which could allow denial of service, caused by improper handling of dangling symlinks in smbd. A remote attacker could exploit this vulnerability to cause a fd_open_atomic infinite loop with high CPU usage and memory consumption on the system.

Vulnerability Details

CVEID: CVE-2017-9461 DESCRIPTION: Samba is vulnerable to a denial of service, caused by improper handling of dangling symlinks in smbd. A remote attacker could exploit this vulnerability to cause a fd_open_atomic infinite loop with high CPU usage and memory consumption on the system.
CVSS Base Score: 7.5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/126916 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)

Affected Products and Versions

IBM Spectrum Scale V4.2.3.0

IBM Spectrum Scale V4.2.2.0 thru V4.2.2.3

IBM Spectrum Scale V4.2.1.0 thru V4.2.1.2

IBM Spectrum Scale V4.2.0 thru V4.2.0.4

IBM Spectrum Scale V4.1.1.0 thru V4.1.1.15

Remediation/Fixes

For IBM Spectrum Scale V4.2.0.0 thru V4.2.3.0, apply V4.2.3.1, or later, 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 V4.1.1.0 thru V4.1.1.15, apply V4.1.1.16 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:

• For IBM Spectrrum Scale 4.2.0.0 - 4.2.0.4, 4.2.1.0 - 4.2.1.2, 4.2.2.0 - 4.2.2.3, and 4.2.3.0, reference APAR IV97368
• For IBM Spectrum Scale V4.1.1.0 thru 4.1.1.15, reference APAR IV97547

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

Workarounds and Mitigations

None