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Security Bulletin: Privilege Escalation / User Impersonation affects IBM Platform LSF and IBM Spectrum LSF

Security Bulletin


Summary

This is to address security vulnerabilities in IBM Spectrum LSF and IBM Platform LSF (Load Sharing Facility) that could allow a local attacker to impersonate arbitrary users to submit jobs to LSF, and possibly run LSF jobs as root.

LSF uses an external authentication framework to secure user credentials for the data stream between LSF clients and servers. By default, LSF provides an eauth executable file which takes a static authorization key to encrypt the data. As part of the installation process, changing the default key is important to prevent unauthorized access. However, many sites do not change this default key and are therefore vulnerable to CVE-2017-1205.

This issue was present and undetected for over ten years, even during previous third party security reviews. There are no reported instances of anyone having exploited this defect to gain root privileges.

This fix addresses CVE-2017-1205 by enhancing the default eauth executable file to automatically generate site-specific keys, and is available for all supported versions of LSF on all supported operating systems.

Sites that use LSF Kerberos authentication are not affected by this issue, but installing this fix addresses potential vulnerabilities if LSF Kerberos authentication is unavailable.

Vulnerability Details

CVEID: CVE-2017-1205
DESCRIPTION: IBM Platform LSF contains an unspecified vulnerability that could allow a local user to escalate their privileges and obtain root access.
CVSS Base Score: 9.3

CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/123741 for the current score

CVSS Environmental Score*: Undefined

CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)

Affected Products and Versions

IBM Spectrum LSF 8.3, 9.1.1, 9.1.2, 9.1.3, 10.1, 10.1.0.1

Remediation/Fixes

<Product VRMF APAR Remediation/First Fix
IBM Platform LSF 8.3 P102111 445650
IBM Platform LSF 9.1.1 P102106 445784
IBM Platform LSF 9.1.2 P102109 445808
IBM Platform LSF 9.1.3 P102108 445809
IBM Spectrum LSF 10.1, 10.1.0.1 P102110 443727
1. For different versions different fix are provided. Download fix from below location:

IBM Platform LSF 8.3
Fix Central URL
http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=Platform%2BComputing&product=ibm/Other+software/Platform+LSF&release=All&platform=All&function=fixId&fixids=lsf-8.3-build445650&includeSupersedes=0

Fix ID: lsf-8.3-build445650
IBM Platform LSF 9.1.1
http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=Platform%2BComputing&product=ibm/Other+software/Platform+LSF&release=All&platform=All&function=fixId&fixids=lsf-9.1.1-build445784&includeSupersedes=0

Fix ID: lsf-9.1.1-build445784

IBM Platform LSF 9.1.2
Fix Central URL
http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=Platform%2BComputing&product=ibm/Other+software/Platform+LSF&release=All&platform=All&function=fixId&fixids=lsf-9.1.2-build445808&includeSupersedes=0

Fix ID: lsf-9.1.2-build445808

IBM Platform LSF 9.1.3
Fix Central URL
http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=Platform%2BComputing&product=ibm/Other+software/Platform+LSF&release=All&platform=All&function=fixId&fixids=lsf-9.1.3-build445809&includeSupersedes=0

Fix ID: lsf-9.1.3-build445809

IBM Spectrum LSF 10.1, 10.1.0.1
Fix Central URL
http://www-933.ibm.com/support/fixcentral/swg/selectFixes?parent=Platform%2BComputing&product=ibm/Other+software/IBM+Spectrum+LSF&release=All&platform=All&function=fixId&fixids=lsf-10.1-build443727&includeSupersedes=0

Fix ID: lsf-10.1-build443727

2. Installation
Please refer README file for installation steps.

Workarounds and Mitigations

Use LSF Kerberos authentication.

Get Notified about Future Security Bulletins

References

Complete CVSS v3 Guide
On-line Calculator v3

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

The vulnerability was reported to IBM by John Fitzpatrick of MWR InfoSecurity

Change History

<6 Apr 2017>: Original version published
<7 Apr 2017>: Add Acknowledgement section
<7 Apr 2017>: Update Summary, Remediation/Fixes and Workarounds and Mitigations

*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 information

More support for: Spectrum LSF

Software version: 10.1

Operating system(s): Platform Independent

Software edition: Advanced, Enterprise, Standard

Reference #: T1025091

Modified date: 08 April 2017