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Security Bulletin: Vulnerability in Linux-PAM affects PowerKVM (CVE-2015-3238)

Security Bulletin


PowerKVM is affected by a vulnerability in Linux-PAM. This vulnerability is now fixed.

Vulnerability Details

CVEID: CVE-2015-3238
Linux-PAM could allow a local attacker to obtain sensitive information, caused by an error in the _unix_run_helper_binary function in the pam_unix module. An attacker could exploit this vulnerability using an overly large password to enumerate usernames and cause the system to hang.
CVSS Base Score: 5.1
CVSS Temporal Score: See for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L)

Affected Products and Versions

PowerKVM 2.1


Fix is made available via Fix Central ( in 2.1.1 Build 65.2 and all later 2.1.1 SP3 service builds and 2.1.1 fix packs. For systems currently running fix levels of PowerKVM prior to 2.1.1, please see for prerequisite fixes and instructions. Customers can also update from 2.1.1 (GA and later levels) by using "yum update".

Workarounds and Mitigations


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Related information

Change History

27 October 2015 - Initial Version

*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.


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: PowerKVM

Software version: 2.1

Operating system(s): Linux

Software edition: KVM

Reference #: T1022880

Modified date: 22 December 2015