CVE-2016-3699
First published: Sat Mar 05 2016(Updated: )
A vulnerability was found in the RHEL7.2 kernel. When RHEL 7.2 is booted with UEFI Secure Boot enabled, securelevel is set. The kernel uses the state of securelevel to prevent userspace from inserting untrusted privileged code at runtime. The ACPI tables provided by firmware can be overwritten using the initrd. From the kernel documentation: If the ACPI_INITRD_TABLE_OVERRIDE compile option is true, it is possible to override nearly any ACPI table provided by the BIOS with an instrumented, modified one. RHEL 7.2 has CONFIG_ACPI_INITRD_TABLE_OVERRIDE kernel config option enabled, and will load ACPI tables appended to the initrd, even if booted with UEFI Secure Boot enabled and securelevel set. Upstream patch: <a href="https://github.com/mjg59/linux/commit/a4a5ed2835e8ea042868b7401dced3f517cafa76">https://github.com/mjg59/linux/commit/a4a5ed2835e8ea042868b7401dced3f517cafa76</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:3.10.0-514.rt56.420.el7 | 0:3.10.0-514.rt56.420.el7 |
| redhat/kernel | <0:3.10.0-514.el7 | 0:3.10.0-514.el7 |
| Linux Linux kernel | ||
| Redhat Enterprise Mrg | =2.0 | |
| Redhat Linux | =7.2 |
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Reference Links
- https://github.com/mjg59/linux/commit/a4a5ed2835e8ea042868b7401dced3f517cafa76
- https://access.redhat.com/security/cve/CVE-2016-3699
- https://rhn.redhat.com/errata/RHSA-2016-2574.html
- https://rhn.redhat.com/errata/RHSA-2016-2584.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1329653
- https://www.cve.org/CVERecord?id=CVE-2016-3699 https://nvd.nist.gov/vuln/detail/CVE-2016-3699
- https://access.redhat.com/errata/RHSA-2016:2584
- https://access.redhat.com/errata/RHSA-2016:2574
- http://rhn.redhat.com/errata/RHSA-2016-2574.html
- http://rhn.redhat.com/errata/RHSA-2016-2584.html
- http://www.openwall.com/lists/oss-security/2016/09/22/4
- http://www.securityfocus.com/bid/93114
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