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Ubuntu Security Notice USN-2564-1

Ubuntu Security Notice USN-2564-1
Posted Apr 9, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2564-1 - An integer overflow was discovered in the stack randomization feature of the Linux kernel on 64 bit platforms. A local attacker could exploit this flaw to bypass the Address Space Layout Randomization (ASLR) protection mechanism. An information leak was discovered in the Linux Kernel's handling of userspace configuration of the link layer control (LLC). A local user could exploit this flaw to read data from other sysctl settings. Various other issues were also addressed.

tags | advisory, overflow, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-1593, CVE-2015-2041, CVE-2015-2042
SHA-256 | b4b5729a8b3105060a97d50bfcaf3b153c00ee7647386935333eed9d44313e11

Ubuntu Security Notice USN-2564-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2564-1
April 09, 2015

linux-lts-utopic vulnerabilities
============================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux-lts-utopic: Linux hardware enablement kernel from Utopic

Details:

An integer overflow was discovered in the stack randomization feature of
the Linux kernel on 64 bit platforms. A local attacker could exploit this
flaw to bypass the Address Space Layout Randomization (ASLR) protection
mechanism. (CVE-2015-1593)

An information leak was discovered in the Linux Kernel's handling of
userspace configuration of the link layer control (LLC). A local user could
exploit this flaw to read data from other sysctl settings. (CVE-2015-2041)

An information leak was discovered in how the Linux kernel handles setting
the Reliable Datagram Sockets (RDS) settings. A local user could exploit
this flaw to read data from other sysctl settings. (CVE-2015-2042)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.16.0-34-generic 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-generic-lpae 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-lowlatency 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc-e500mc 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc-smp 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc64-emb 3.16.0-34.45~14.04.1
linux-image-3.16.0-34-powerpc64-smp 3.16.0-34.45~14.04.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2564-1
CVE-2015-1593, CVE-2015-2041, CVE-2015-2042

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-34.45~14.04.1
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