ESB-2018.2716 - [Ubuntu] linux kernel: Multiple vulnerabilities 2018-09-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2716
                     Security updates for linux kernel
                             12 September 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           linux kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise   -- Existing Account
                   Denial of Service -- Existing Account
                   Reduced Security  -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-13406 CVE-2018-13405 CVE-2018-12233
                   CVE-2018-11506 CVE-2018-11412 

Reference:         ESB-2018.2056
                   ESB-2018.2515.3

Original Bulletin: 
   https://lists.ubuntu.com/archives/ubuntu-security-announce/2018-September/004573.html

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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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