Security Bulletin: Vulnerabilities in GSKit 8 affect Tivoli Directory Server and IBM Security Directory Server for AIX/VIOS (CVE-2015-7421, CVE-2015-7420)

Security Bulletin

Summary

Vulnerabilities were discovered in GSKit 8. Tivoli Directory Server and IBM Security Directory Server use GSKit 8 and have addressed the applicable CVE's. GSKit 7 is not affected.

Vulnerability Details

CVEID: CVE-2015-7421
DESCRIPTION: A vulnerability in GSKit could allow a remote attacker to obtain sensitive information. The internal ICC PRNG pool state is duplicated during a fork() system call operation which results in a period of time where child processes may generate identical PRNG output to the parent. This may allow possible attacks related to predicable state which an attacker could exploit.
CVSS Base Score: 3.7
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/107695 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)

CVEID: CVE-2015-7420
DESCRIPTION: A vulnerability in GSKit could allow a remote attacker to obtain sensitive information. The GSKit PRNG state is duplicated during a fork() system call operation which results in a period of time where child processes may generate identical PRNG output to the parent.
CVSS Base Score: 3.7
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/107694 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N)

Affected Products and Versions

AIX 5.3, 6.1, 7.1, 7.2

VIOS 2.2.x

Remediation/Fixes

The GSKit package contains a fix and needs to be installed on AIX/VIOS systems.

The fixes for the GSKit components can be downloaded at the following link:

https://www-304.ibm.com/support/docview.wss?uid=swg21972076

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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Acknowledgement

None.

Change History

Original publication

*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.

*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 GSKit 8 affect Tivoli Directory Server and IBM Security Directory Server for AIX/VIOS (CVE-2015-7421, CVE-2015-7420)