CVE-2016-9604

Impact:
Low
Public Date:
2017-04-18
CWE:
CWE-732
Bugzilla:
1389433: CVE-2016-9604 kernel: security: The built-in keyrings for security tokens can be joined as a session and then modified by the root user
It was discovered that root can gain direct access to an internal keyring, such as '.dns_resolver' in RHEL-7 or '.builtin_trusted_keys' upstream, by joining it as its session keyring. This allows root to bypass module signature verification by adding a new public key of its own devising to the keyring.

Find out more about CVE-2016-9604 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code with the flaw is not present in this product.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.

CVSS v2 metrics

Base Score 1.2
Base Metrics AV:L/AC:H/Au:N/C:N/I:P/A:N
Access Vector Local
Access Complexity High
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None

CVSS v3 metrics

CVSS3 Base Score 4.4
CVSS3 Base Metrics CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Attack Vector Local
Attack Complexity Low
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Impact High
Availability Impact None

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 7 (kernel) RHSA-2017:1842 2017-08-01
Red Hat MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHSA-2017:2669 2017-09-06
Red Hat Enterprise Linux for Real Time for NFV (v. 7) (kernel-rt) RHSA-2017:2077 2017-08-01

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 6 kernel Will not fix
Red Hat Enterprise Linux 5 kernel Not affected
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.

Acknowledgements

This issue was discovered by David Howells (Red Hat).
Last Modified