Exploit the possiblities

Kernel Live Patch Security Notice LSN-0029-1

Kernel Live Patch Security Notice LSN-0029-1
Posted Aug 30, 2017
Authored by Benjamin M. Romer

It was discovered that the Linux kernel did not honor the UEFI secure boot mode when performing a kexec operation. A local attacker could use this to bypass secure boot restrictions. Huang Weller discovered that the ext4 filesystem implementation in the Linux kernel mishandled a needs-flushing-before-commit list. A local attacker could use this to expose sensitive information.

tags | advisory, kernel, local
systems | linux
advisories | CVE-2015-7837, CVE-2017-7495
MD5 | e1cdddf8c51cfb6dc9e25a8466744db4

Kernel Live Patch Security Notice LSN-0029-1

Change Mirror Download
==========================================================================
Kernel Live Patch Security Notice LSN-0029-1
August 30, 2017

linux vulnerability
==========================================================================

A security issue affects these releases of Ubuntu:

| Series | Base kernel | Arch | flavors |
|------------------+--------------+----------+------------------|
| Ubuntu 14.04 LTS | 4.4.0 | amd64 | generic |
| Ubuntu 14.04 LTS | 4.4.0 | amd64 | lowlatency |
| Ubuntu 16.04 LTS | 4.4.0 | amd64 | generic |
| Ubuntu 16.04 LTS | 4.4.0 | amd64 | lowlatency |

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

It was discovered that the Linux kernel did not honor the UEFI secure boot
mode when performing a kexec operation. A local attacker could use this to
bypass secure boot restrictions. (CVE-2015-7837)

Huang Weller discovered that the ext4 filesystem implementation in the
Linux kernel mishandled a needs-flushing-before-commit list. A local
attacker could use this to expose sensitive information. (CVE-2017-7495)

Update instructions:

The problem can be corrected by updating your livepatches to the following
versions:

| Kernel | Version | flavors |
|-----------------+----------+--------------------------|
| 4.4.0-21.37 | 29.1 | generic, lowlatency |
| 4.4.0-22.39 | 29.1 | generic, lowlatency |
| 4.4.0-22.40 | 29.1 | generic, lowlatency |
| 4.4.0-24.43 | 29.1 | generic, lowlatency |
| 4.4.0-28.47 | 29.1 | generic, lowlatency |
| 4.4.0-31.50 | 29.1 | generic, lowlatency |
| 4.4.0-34.53 | 29.1 | generic, lowlatency |
| 4.4.0-36.55 | 29.1 | generic, lowlatency |
| 4.4.0-38.57 | 29.1 | generic, lowlatency |
| 4.4.0-42.62 | 29.1 | generic, lowlatency |
| 4.4.0-43.63 | 29.1 | generic, lowlatency |
| 4.4.0-45.66 | 29.1 | generic, lowlatency |
| 4.4.0-47.68 | 29.1 | generic, lowlatency |
| 4.4.0-51.72 | 29.1 | generic, lowlatency |
| 4.4.0-53.74 | 29.1 | generic, lowlatency |
| 4.4.0-57.78 | 29.1 | generic, lowlatency |
| 4.4.0-59.80 | 29.1 | generic, lowlatency |
| 4.4.0-62.83 | 29.1 | generic, lowlatency |
| 4.4.0-63.84 | 29.1 | generic, lowlatency |
| 4.4.0-64.85 | 29.1 | generic, lowlatency |
| 4.4.0-66.87 | 29.1 | generic, lowlatency |
| 4.4.0-67.88 | 29.1 | generic, lowlatency |
| 4.4.0-70.91 | 29.1 | generic, lowlatency |
| 4.4.0-71.92 | 29.1 | generic, lowlatency |
| 4.4.0-72.93 | 29.1 | generic, lowlatency |
| 4.4.0-75.96 | 29.1 | generic, lowlatency |
| 4.4.0-77.98 | 29.1 | generic, lowlatency |
| 4.4.0-78.99 | 29.1 | generic, lowlatency |
| 4.4.0-79.100 | 29.1 | generic, lowlatency |
| 4.4.0-81.104 | 29.1 | generic, lowlatency |
| 4.4.0-83.106 | 29.1 | generic, lowlatency |
| 4.4.0-87.110 | 29.1 | generic, lowlatency |
| 4.4.0-89.112 | 29.1 | generic, lowlatency |
| 4.4.0-91.114 | 29.1 | generic, lowlatency |
| lts-4.4.0-21.37_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-22.39_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-24.43_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-28.47_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-31.50_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-34.53_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-36.55_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-38.57_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-42.62_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-45.66_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-47.68_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-51.72_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-53.74_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-57.78_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-59.80_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-62.83_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-63.84_14.04.2-lts-xenial | 14.04.2 | generic, lowlatency |
| lts-4.4.0-64.85_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-66.87_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-70.91_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-71.92_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-72.93_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-75.96_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-78.99_14.04.2-lts-xenial | 14.04.2 | generic, lowlatency |
| lts-4.4.0-79.100_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-81.104_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-87.110_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |

Additionally, you should install an updated kernel with these fixes and
reboot at your convienience.

References:
CVE-2015-7837, CVE-2017-7495

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