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Ubuntu 4017-2 Moderate: Kernel Crash Due To Packet Handling Flaw

ubuntu
Calendar Grey June 17, 2019
Dist Ubuntu Esm H88
Debian Patch DSA-4698-1 addresses severe vulnerabilities in the kernel that lead to potential instability from malicious network packets.
The system could be made to crash if it received specially crafted network traffic.

Summary

The system could be made to crash if it received specially crafted

network traffic.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM

Details:

USN-4017-1 fixed vulnerabilities in the Linux kernel for Ubuntu.

This update provides the corresponding updates for the Linux kernel

for Ubuntu 16.04 ESM and Ubuntu 14.04 ESM.

Jonathan Looney discovered that the TCP retransmission queue implementation

in the Linux kernel could be fragmented when handling certain TCP Selective

Acknowledgment (SACK) sequences. A remote attacker could use this to cause

a denial of service. (CVE-2019-11478)

Jonathan Looney discovered that an integer overflow existed in the Linux

kernel when handling TCP Selective Acknowledgments (SACKs...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory Ubuntu kernel update instructions Denial of Service system crash network issue

Update Instructions

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

Ubuntu 14.04 ESM:
  linux-image-3.13.0-171-generic  3.13.0-171.222
  linux-image-3.13.0-171-generic-lpae  3.13.0-171.222
  linux-image-3.13.0-171-lowlatency  3.13.0-171.222
  linux-image-4.15.0-1047-azure   4.15.0-1047.51~14.04.1
  linux-image-4.4.0-1046-aws      4.4.0-1046.50
  linux-image-4.4.0-151-generic   4.4.0-151.178~14.04.1
  linux-image-4.4.0-151-generic-lpae  4.4.0-151.178~14.04.1
  linux-image-4.4.0-151-lowlatency  4.4.0-151.178~14.04.1
  linux-image-aws                 4.4.0.1046.47
  linux-image-azure               4.15.0.1047.34
  linux-image-generic             3.13.0.171.182
  linux-image-generic-lpae        3.13.0.171.182
  linux-image-generic-lpae-lts-xenial  4.4.0.151.133
  linux-image-generic-lts-xenial  4.4.0.151.133
  linux-image-lowlatency-lts-xenial  4.4.0.151.133

Ubuntu 12.04 ESM:
  linux-image-3.13.0-171-generic  3.13.0-171.222~12.04.1
  linux-image-3.13.0-171-generic-lpae  3.13.0-171.222~12.04.1
  linux-image-3.13.0-171-lowlatency  3.13.0-171.222~12.04.1
  linux-image-3.2.0-141-generic   3.2.0-141.188
  linux-image-generic             3.2.0.141.156
  linux-image-generic-lpae-lts-trusty  3.13.0.171.159
  linux-image-generic-lts-trusty  3.13.0.171.159

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://ubuntu.com/security/notices/USN-4017-2

https://ubuntu.com/security/notices/USN-4017-1

CVE-2019-11477, CVE-2019-11478,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic

Severity
important
Lowest
Low
Medium
High
Critical

June 17, 2019

Topics%20covered

Topics Covered

security advisory Ubuntu kernel update instructions Denial of Service system crash network issue

Package Information

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