IBM Support

Security Bulletin: A vulnerability has been identified in IBM Spectrum Scale where an unprivileged user could execute commands as root ( CVE-2020-4273)

Security Bulletin


Summary

A security vulnerability has been identified in all levels of IBM Spectrum Scale that could allow underprivileged attacker to execute commands as root. A fix for this vulnerability is available.

Vulnerability Details

CVEID:   CVE-2020-4273
DESCRIPTION:   IBM Spectrum Scale could allow a local unprivileged attacker with intimate knowledge of the enviornment to execute commands as root using specially crafted input.
CVSS Base score: 7.4
CVSS Temporal Score: See: https://exchange.xforce.ibmcloud.com/vulnerabilities/175977 for the current score.
CVSS Vector: (CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

Affected Product(s) Version(s)
IBM Spectrum Scale All

Remediation/Fixes

For IBM Spectrum Scale V5.0.0.0 through 5.0.4.2, apply V5.0.4.3 available from FixCentral at:

https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=Software%20defined%20storage&product=ibm/StorageSoftware/IBM+Spectrum+Scale&release=5.0.4&platform=All&function=all

For IBM Spectrum Scale V4.2.0.0 through V4.2.3.20, apply V4.2.3.21 available from FixCentral at:

https://www.ibm.com/support/fixcentral/swg/selectFixes?parent=Software%20defined%20storage&product=ibm/StorageSoftware/IBM+Spectrum+Scale&release=4.2.3&platform=All&function=all

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

- For IBM Spectrum Scale V5.0.0.0 through V5.0.4.2, reference APAR  IJ23438

- For IBM Spectrum Scale V4.2.0.0 through V4.2.3.20, reference APAR  IJ23426

Workarounds and Mitigations

Until the fixes can be applied, a workaround is to remove the setuid from the files in the /usr/lpp/mmfs/bin directory. Determine the set of files with setuid bit by running

ls -l /usr/lpp/mmfs/bin | grep r-s

Then reset the setuid bit for each such file by issuing this command on each file

chmod u-s file


Once the workaround is applied, a number of commands may no longer work when not invoked by unprivileged users, including:

mmchfileset
mmcrsnapshot
mmdelsnapshot
mmdf
mmedquota
mmgetacl
mmlsdisk
mmlsfileset
mmlsfs
mmlsmgr
mmlspolicy
mmlspool
mmlsquota
mmlssnapshot
mmputacl
mmsnapdir

Get Notified about Future Security Bulletins

References

Off

Acknowledgement

The vulnerability was reported to IBM by Winston S

Change History

21 April 2020: Final version Published with updated APAR details

*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

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.

Document Location

Worldwide

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"STXKQY","label":"IBM Spectrum Scale"},"Component":"","Platform":[{"code":"PF016","label":"Linux"},{"code":"PF002","label":"AIX"}],"Version":"4.2, 5.0","Edition":"","Line of Business":{"code":"LOB26","label":"Storage"}}]

Document Information

Modified date:
22 April 2020

UID

ibm16151701