exploit the possibilities

Kernel Live Patch Security Notice LSN-0030-1

Kernel Live Patch Security Notice LSN-0030-1
Posted Sep 19, 2017
Authored by Benjamin M. Romer

The Linux Kernel running on AMD64 systems will sometimes map the contents of PIE executable, the heap or ld.so to where the stack is mapped allowing attackers to more easily manipulate the stack. It was discovered that a buffer overflow existed in the Bluetooth stack of the Linux kernel when handling L2CAP configuration responses. A physically proximate attacker could use this to cause a denial of service (system crash). It was discovered that the Flash-Friendly File System (f2fs) implementation in the Linux kernel did not properly validate superblock metadata. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux
advisories | CVE-2017-1000251, CVE-2017-1000379, CVE-2017-10663
MD5 | f0f811c3905f66d55df59c33e5694479

Kernel Live Patch Security Notice LSN-0030-1

Change Mirror Download
==========================================================================
September 18, 2017

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

A security issue affects these releases of Ubuntu:

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

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

The Linux Kernel running on AMD64 systems will sometimes map the contents
of PIE executable, the heap or ld.so to where the stack is mapped allowing
attackers to more easily manipulate the stack. (CVE-2017-1000379)

It was discovered that a buffer overflow existed in the Bluetooth stack of
the Linux kernel when handling L2CAP cpnfiguration responses. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2017-1000251)

It was discovered that the Flash-Friendly File System (f2fs) implementation
in the Linux kernel did not properly validate superblock metadata. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-10663)

Update instructions:

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

| Kernel | Version | flavors |
|-----------------+----------+--------------------------|
| 4.4.0-21.37 | 30.3 | generic, lowlatency |
| 4.4.0-22.39 | 30.3 | generic, lowlatency |
| 4.4.0-22.40 | 30.3 | generic, lowlatency |
| 4.4.0-24.43 | 30.3 | generic, lowlatency |
| 4.4.0-28.47 | 30.3 | generic, lowlatency |
| 4.4.0-31.50 | 30.3 | generic, lowlatency |
| 4.4.0-34.53 | 30.3 | generic, lowlatency |
| 4.4.0-36.55 | 30.3 | generic, lowlatency |
| 4.4.0-38.57 | 30.3 | generic, lowlatency |
| 4.4.0-42.62 | 30.3 | generic, lowlatency |
| 4.4.0-43.63 | 30.3 | generic, lowlatency |
| 4.4.0-45.66 | 30.3 | generic, lowlatency |
| 4.4.0-47.68 | 30.3 | generic, lowlatency |
| 4.4.0-51.72 | 30.3 | generic, lowlatency |
| 4.4.0-53.74 | 30.3 | generic, lowlatency |
| 4.4.0-57.78 | 30.3 | generic, lowlatency |
| 4.4.0-59.80 | 30.3 | generic, lowlatency |
| 4.4.0-62.83 | 30.3 | generic, lowlatency |
| 4.4.0-63.84 | 30.3 | generic, lowlatency |
| 4.4.0-64.85 | 30.3 | generic, lowlatency |
| 4.4.0-66.87 | 30.3 | generic, lowlatency |
| 4.4.0-67.88 | 30.3 | generic, lowlatency |
| 4.4.0-70.91 | 30.3 | generic, lowlatency |
| 4.4.0-71.92 | 30.3 | generic, lowlatency |
| 4.4.0-72.93 | 30.3 | generic, lowlatency |
| 4.4.0-75.96 | 30.3 | generic, lowlatency |
| 4.4.0-77.98 | 30.3 | generic, lowlatency |
| 4.4.0-78.99 | 30.3 | generic, lowlatency |
| 4.4.0-79.100 | 30.3 | generic, lowlatency |
| 4.4.0-81.104 | 30.3 | generic, lowlatency |
| 4.4.0-83.106 | 30.3 | generic, lowlatency |
| 4.4.0-87.110 | 30.3 | generic, lowlatency |
| 4.4.0-89.112 | 30.3 | generic, lowlatency |
| 4.4.0-91.114 | 30.3 | generic, lowlatency |
| 4.4.0-92.115 | 30.3 | generic, lowlatency |
| 4.4.0-93.116 | 30.3 | 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-4.4.0-22.40_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 |
| lts-4.4.0-89.112_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-91.114_14.04.1-lts-xenial | 14.04.1 | generic, lowlatency |
| lts-4.4.0-92.115_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-2017-1000251, CVE-2017-1000379, CVE-2017-10663

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