Security Bulletin: Open Source GNU glibc Vulnerabilities which is used by IBM OS Images for RedHat Linux in IBM PureApplication Systems (CVE-2017-1000366)

Security Bulletin

Summary

There are vulnerabilities in the Open Source GNU glibc that is used by the OS Images for IBM PureApplication Software Suite, IBM Bluemix Local System and IBM PureApplication System/Software

Vulnerability Details

CVEID: CVE-2017-1000366
DESCRIPTION: Glibc could allow a local attacker to execute arbitrary code on the system, caused by a vulnerability that allows specially crafted LD_LIBRARY_PATH values to manipulate the heap/stack. By using specially-crafted crafted LD_LIBRARY_PATH values, an attacker could exploit this vulnerability to trigger a stack memory allocation flaw and execute arbitrary code on the system.
CVSS Base Score: 7.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/127452 for the current score
CVSS Environmental Score*: Undefined
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

IBM OS Image for Red Hat Linux Systems 2.1.5.0
IBM OS Image for Red Hat Linux Systems 2.1.6.0
IBM OS Image for Red Hat Linux Systems 2.1.7.0
IBM OS Image for Red Hat Linux Systems 2.1.8.0
IBM OS Image for Red Hat Linux Systems 3.0.5.0
IBM OS Image for Red Hat Linux Systems 3.0.6.0
IBM OS Image for Red Hat Linux Systems 3.0.7.0

Remediation/Fixes

The deployed Red Hat Linux-based virtual machines on IBM PureApplication System types are affected. The solution is to apply the following emergency fix to the deployed virtual machines.

Download update:
http://www.ibm.com/support/fixcentral/swg/quickorder?parent=PureSystems&product=ibm/WebSphere/PureApplication+System&release=2.2.3.2&platform=All&function=fixId&fixids=glibc_patch_Sept_2017-sys&includeRequisites=1&includeSupersedes=0&downloadMethod=ddp&source=fc

1. Import the fix into the Emergency Fix catalogue.
2. For deployed instances, apply this emergency fix on the VM. The glibc library on the IBM OS Image for Red Hat Linux Systems will be updated to contain the fix.
3. Restart the deployed instance after the fix is applied.
4. Verify that this fix does not cause any compatibility issues.

Optionally, the operating system vendor provides a glibc fix. The fix can be applied by running the command “yum update glibc” within the deployed virtual machine to upgrade to the latest glibc version.

Workarounds and Mitigations

None

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References

Complete CVSS v2 Guide
On-line Calculator v2

Complete CVSS v3 Guide
On-line Calculator v3

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Change History

September 22, 2017: Original document published

*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.

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Tips

Security Bulletin: Open Source GNU glibc Vulnerabilities which is used by IBM OS Images for RedHat Linux in IBM PureApplication Systems (CVE-2017-1000366)