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AUSCERT External Security Bulletin Redistribution
ESB-2017.2544.2
Linux kernel vulnerabilities
12 October 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Root Compromise -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-1000255 CVE-2017-14106
Reference: ESB-2017.2537
ESB-2017.2401
Original Bulletin:
http://www.ubuntu.com/usn/usn-3443-1
http://www.ubuntu.com/usn/usn-3443-2
https://www.ubuntu.com/usn/usn-3443-3
Comment: This bulletin contains three (3) Ubuntu security advisories.
Revision History: October 12 2017: updated package versions
October 11 2017: Initial Release
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==========================================================================
Ubuntu Security Notice USN-3443-1
October 10, 2017
linux, linux-raspi2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 17.04
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- - linux: Linux kernel
- - linux-raspi2: Linux kernel for Raspberry Pi 2
Details:
It was discovered that on the PowerPC architecture, the kernel did not
properly sanitize the signal stack when handling sigreturn(). A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-1000255)
Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 17.04:
linux-image-4.10.0-1019-raspi2 4.10.0-1019.22
linux-image-4.10.0-37-generic 4.10.0-37.41
linux-image-4.10.0-37-generic-lpae 4.10.0-37.41
linux-image-4.10.0-37-lowlatency 4.10.0-37.41
linux-image-generic 4.10.0.37.37
linux-image-generic-lpae 4.10.0.37.37
linux-image-lowlatency 4.10.0.37.37
linux-image-powerpc-e500mc 4.10.0.37.37
linux-image-powerpc-smp 4.10.0.37.37
linux-image-powerpc64-emb 4.10.0.37.37
linux-image-powerpc64-smp 4.10.0.37.37
linux-image-raspi2 4.10.0.1019.20
linux-image-virtual 4.10.0.37.37
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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
https://www.ubuntu.com/usn/usn-3443-1
CVE-2017-1000255, CVE-2017-14106
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.10.0-37.41
https://launchpad.net/ubuntu/+source/linux-raspi2/4.10.0-1019.22
==========================================================================
Ubuntu Security Notice USN-3443-2
October 10, 2017
linux-hwe vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 16.04 LTS
Summary:
Several security issues were fixed in the Linux kernel.
Software Description:
- - linux-hwe: Linux hardware enablement (HWE) kernel
Details:
USN-3443-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.04.
This update provides the corresponding updates for the Linux Hardware
Enablement (HWE) kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS.
It was discovered that on the PowerPC architecture, the kernel did not
properly sanitize the signal stack when handling sigreturn(). A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-1000255)
Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.10.0-37-generic 4.10.0-37.41~16.04.1
linux-image-4.10.0-37-generic-lpae 4.10.0-37.41~16.04.1
linux-image-4.10.0-37-lowlatency 4.10.0-37.41~16.04.1
linux-image-generic-hwe-16.04 4.10.0.37.39
linux-image-generic-lpae-hwe-16.04 4.10.0.37.39
linux-image-lowlatency-hwe-16.04 4.10.0.37.39
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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
https://www.ubuntu.com/usn/usn-3443-2
https://www.ubuntu.com/usn/usn-3443-1
CVE-2017-1000255, CVE-2017-14106
Package Information:
https://launchpad.net/ubuntu/+source/linux-hwe/4.10.0-37.41~16.04.1
==========================================================================
Ubuntu Security Notice USN-3443-3
October 11, 2017
linux-gcp vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 16.04 LTS
Summary:
The system could be made to crash under certain conditions.
Software Description:
- - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
Details:
Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.10.0-1007-gcp 4.10.0-1007.7
linux-image-gcp 4.10.0.1007.9
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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.
References:
https://www.ubuntu.com/usn/usn-3443-3
https://www.ubuntu.com/usn/usn-3443-1
CVE-2017-14106
Package Information:
https://launchpad.net/ubuntu/+source/linux-gcp/4.10.0-1007.7
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