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Ubuntu 18.04 LTS USN-4592-1 Critical: Bluetooth Kernel Issues

ubuntu
Calendar Grey October 19, 2020
Dist Ubuntu Esm H88
Tackle several vulnerabilities impacting the Ubuntu kernel through essential fixes. Discover further details regarding the updates and suggested measures.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-osp1: Linux kernel for OEM systems

- linux-raspi2-5.3: Linux kernel for Raspberry Pi (V8) systems

Details:

Andy Nguyen discovered that the Bluetooth L2CAP implementation in the Linux

kernel contained a type-confusion error. A physically proximate remote

attacker could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2020-12351)

Andy Nguyen discovered that the Bluetooth A2MP implementation in the Linux

kernel did not properly initialize memory in some situations. A physically

proximate remote attacker could use this to expose sensitive information

(kernel memory). (CVE-2020-12352)

Andy Nguyen discovered that the Bluetooth HCI event packet parser in the

Linux kernel did not properly handle event advertisements of certain sizes,

leading to a heap-based buffer overflow. A physically proximate remote

attacker could use this to cause a denial of serv...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory doS memory issue ubuntu system crash linux kernel bluetooth

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1070-oem-osp1  5.0.0-1070.76
  linux-image-5.3.0-1036-raspi2   5.3.0-1036.38
  linux-image-oem-osp1            5.0.0.1070.68
  linux-image-raspi2-hwe-18.04    5.3.0.1036.25

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-4592-1

CVE-2020-12351, CVE-2020-12352, CVE-2020-24490

Severity
critical
Lowest
Low
Medium
High
Critical

October 20, 2020

Topics%20covered

Topics Covered

security advisory doS memory issue ubuntu system crash linux kernel bluetooth

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi2-5.3/5.3.0-1036.38

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