Security Bulletin: Vulnerabilities in MIT Kerberos affect PowerKVM (CVE-2015-8629,CVE-2015-8630,CVE-2015-8631)

Security Bulletin

Summary

PowerKVM is affected by vulnerabilities in MIT Kerberos (krb5). These vulnerabilities are now fixed.

Vulnerability Details

CVEID: CVE-2015-8629
DESCRIPTION: MIT Kerberos could allow a remote authenticated attacker to obtain sensitive information, caused by a null termination in the xdr_nullstring() function. By sending specially-crafted data, an attacker could exploit this vulnerability to obtain sensitive information from the memory.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110395 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)

CVEID: CVE-2015-8630
DESCRIPTION: MIT Kerberos is vulnerable to a denial of service, caused by a NULL pointer dereference in the kadm5_modify_principal() function. By sending specially-crafted data, a remote authenticated attacker could exploit this vulnerability to cause the kadmind service to crash.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110394 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2015-8631
DESCRIPTION: MIT Kerberos is vulnerable to a denial of service, caused by the leak of the client and server name by the rb5_unparse_name() function. By sending specially-crafted data, a remote authenticated attacker could exploit this vulnerability to consume all available memory resources.
CVSS Base Score: 4.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/110393 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L)

Affected Products and Versions

PowerKVM 2.1 and PowerKVM 3.1

Remediation/Fixes

Customers can update PowerKVM systems by using "yum update".

Fix images are made available via Fix Central. For version 3.1, see https://ibm.biz/BdHggw for 3.1.0.1 update 2 or later.

For version 2.1, see PowerKVM 2.1.1.3-65. Update 9 at https://ibm.biz/BdEnT8 and all later 2.1.1 service updates. Customers running v2.1 are, in any case, encouraged to upgrade to v3.1.

For v2.1 systems currently running fix levels of PowerKVM prior to 2.1.1, please see http://download4.boulder.ibm.com/sar/CMA/OSA/05e4c/0/README for prerequisite fixes and instructions.

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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

9 May 2016 - 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.

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: Vulnerabilities in MIT Kerberos affect PowerKVM (CVE-2015-8629,CVE-2015-8630,CVE-2015-8631)