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Kernel Live Patch Security Notice LSN-0043-1

Kernel Live Patch Security Notice LSN-0043-1
Posted Sep 11, 2018
Authored by Benjamin M. Romer

Piotr Gabriel Kosinski and Daniel Shapira discovered a stack-based buffer overflow in the CDROM driver implementation of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. Jann Horn discovered that the ext4 filesystem implementation in the Linux kernel did not properly keep xattr information consistent in some situations. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code. Various other issues have also been addressed.

tags | advisory, denial of service, overflow, arbitrary, kernel, local
systems | linux
advisories | CVE-2018-11412, CVE-2018-11506, CVE-2018-12233, CVE-2018-13405, CVE-2018-13406
MD5 | 15d9cf4ac6ec9024e548bcb059849043

Kernel Live Patch Security Notice LSN-0043-1

Change Mirror Download
==========================================================================
Kernel Live Patch Security Notice 0043-1
September 11, 2018

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 | 4.15.0 | amd64 | generic |
| Ubuntu 16.04 LTS | 4.15.0 | amd64 | lowlatency |
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | generic |
| Ubuntu 18.04 LTS | 4.15.0 | amd64 | lowlatency |

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Piotr Gabriel Kosinski and Daniel Shapira discovered a stack-based buffer
overflow in the CDROM driver implementation of the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-11506)

Jann Horn discovered that the ext4 filesystem implementation in the Linux
kernel did not properly keep xattr information consistent in some
situations. An attacker could use this to construct a malicious ext4 image
that, when mounted, could cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-11412)

Silvio Cesare discovered that the generic VESA frame buffer driver in the
Linux kernel contained an integer overflow. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2018-13406)

It was discovered that the Linux kernel did not properly handle setgid file
creation when performed by a non-member of the group. A local attacker
could use this to gain elevated privileges. (CVE-2018-13405)

Shankara Pailoor discovered that the JFS filesystem implementation in the
Linux kernel contained a buffer overflow when handling extended attributes.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2018-12233)

Update instructions:

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

| Kernel | Version | flavors |
|--------------------------+----------+--------------------------|
| 4.4.0-133.159 | 43.1 | generic, lowlatency |
| 4.4.0-133.159~14.04.1 | 43.1 | lowlatency, generic |
| 4.15.0-32.35 | 43.1 | lowlatency, generic |
| 4.15.0-32.35~16.04.1 | 43.4 | generic, lowlatency |

References:
CVE-2018-11506, CVE-2018-11412, CVE-2018-13406, CVE-2018-13405,
CVE-2018-12233

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