Security Bulletin: A vulnerability has been identified in IBM Spectrum Scale where the local attacker can obtain root privilege by injecting parameters into setuid files (CVE-2019-4558)

Security Bulletin

Summary

A security vulnerability has been identified in all levels of IBM Spectrum Scale that could allow one to obtain root privilege by injecting parameters into setuid files. A fix for this vulnerability is available.

Vulnerability Details

CVEID: CVE-2019-4558
DESCRIPTION: A security vulnerability has been identified in all levels of IBM Spectrum Scale (GPFS) that could allow a local attacker to obtain root privilege by injecting parameters into setuid files.
CVSS Base Score: 8.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/166282 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)

Affected Products and Versions

IBM Spectrum Scale V5.0.0.0 through V5.0.3.2

IBM Spectrum Scale V4.2.0.0 through V4.2.3.17

Remediation/Fixes

For IBM Spectrum Scale V5.0.0.0 through 5.0.3.2, apply V5.0.3.3 available from FixCentral at:

https://www-945.ibm.com/support/fixcentral/swg/selectFixes?product=ibm/StorageSoftware/IBM+Spectrum+Scale&function=fixid&fixids=Spectrum_Scale_Advanced-5.0.3.3-x86_64-Linux

For IBM Spectrum Scale V4.2.0.0 through V4.2.3.17, apply V4.2.3.18 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

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

- For IBM Spectrum Scale V5.0.0.0 through V5.0.3.2, reference APAR IJ18477

- For IBM Spectrum Scale V4.2.0.0 through V4.2.3.17, reference APAR IJ18518

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

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

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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.

Internal Use Only

Defect - 1088055, PR - 141829

Document Location

Worldwide

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Tips

Security Bulletin: A vulnerability has been identified in IBM Spectrum Scale where the local attacker can obtain root privilege by injecting parameters into setuid files (CVE-2019-4558)