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Security Bulletin: Vulnerabilities in MIT Kerberos 5 (krb5) affect PowerKVM (CVE-2014-5355, CVE-2015-2694)

Security Bulletin


Summary

PowerKVM is affected by two vulnerabilities in MIT Kerberos 5 (krb5). These vulnerabilities are now fixed.

Vulnerability Details

CVEID: CVE-2014-5355
DESCRIPTION:
MIT Kerberos is vulnerable to a denial of service, caused by a NULL pointer dereference in the krb5_recvauth function. By sending a non-null-terminated version string, a remote attacker could exploit this vulnerability to cause the service to crash.
CVSS Base Score: 5
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/100972 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVEID: CVE-2015-2694
DESCRIPTION:
MIT Kerberos 5 (krb5) could allow a remote attacker to bypass security restrictions, caused by an error in kdcpreauth modules. By sending a specially-crafted request, an attacker could exploit this vulnerability to bypass access restrictions.
CVSS Base Score: 6.4
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/105375 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:N)

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 service build 3 or later.

For version 2.1, the fix is made available via Fix Central (https://ibm.biz/BdEnT8) in 2.1.1 Build 65.6 and all later 2.1.1 SP3 service builds and 2.1.1 service packs. 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.

Workarounds and Mitigations

v2.1 customers can work around the problem by upgrading to the fixed release of v3.1

Get Notified about Future Security Bulletins

References

Off

Change History

29 January 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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Document Information

Modified date:
17 June 2018

UID

isg3T1023354