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Ubuntu Security Notice USN-5678-1

Ubuntu Security Notice USN-5678-1
Posted Oct 17, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5678-1 - It was discovered that the SUNRPC RDMA protocol implementation in the Linux kernel did not properly calculate the header size of a RPC message payload. A local attacker could use this to expose sensitive information. Moshe Kol, Amit Klein and Yossi Gilad discovered that the IP implementation in the Linux kernel did not provide sufficient randomization when calculating port offsets. An attacker could possibly use this to expose sensitive information.

tags | advisory, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2022-0812, CVE-2022-2318, CVE-2022-26365, CVE-2022-32296, CVE-2022-33740, CVE-2022-33744
SHA-256 | 0a03c1780f2221d5e4b4a416dd2a94e74f076c18097d8efbdc44c7d0e564fa82

Ubuntu Security Notice USN-5678-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5678-1
October 13, 2022

linux-aws, linux-gcp-4.15 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

Details:

It was discovered that the SUNRPC RDMA protocol implementation in the Linux
kernel did not properly calculate the header size of a RPC message payload.
A local attacker could use this to expose sensitive information (kernel
memory). (CVE-2022-0812)

Moshe Kol, Amit Klein and Yossi Gilad discovered that the IP implementation
in the Linux kernel did not provide sufficient randomization when
calculating port offsets. An attacker could possibly use this to expose
sensitive information. (CVE-2022-1012, CVE-2022-32296)

Duoming Zhou discovered that race conditions existed in the timer handling
implementation of the Linux kernel's Rose X.25 protocol layer, resulting in
use-after-free vulnerabilities. A local attacker could use this to cause a
denial of service (system crash). (CVE-2022-2318)

Roger Pau Monné discovered that the Xen virtual block driver in the Linux
kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-26365)

Roger Pau Monné discovered that the Xen paravirtualization frontend in the
Linux kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-33740)

It was discovered that the Xen paravirtualization frontend in the Linux
kernel incorrectly shared unrelated data when communicating with certain
backends. A local attacker could use this to cause a denial of service
(guest crash) or expose sensitive information (guest kernel memory).
(CVE-2022-33741, CVE-2022-33742)

Oleksandr Tyshchenko discovered that the Xen paravirtualization platform in
the Linux kernel on ARM platforms contained a race condition in certain
situations. An attacker in a guest VM could use this to cause a denial of
service in the host OS. (CVE-2022-33744)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1137-gcp 4.15.0-1137.153
linux-image-4.15.0-1142-aws 4.15.0-1142.154
linux-image-aws-lts-18.04 4.15.0.1142.142
linux-image-gcp-lts-18.04 4.15.0.1137.153

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-5678-1
CVE-2022-0812, CVE-2022-1012, CVE-2022-2318, CVE-2022-26365,
CVE-2022-32296, CVE-2022-33740, CVE-2022-33741, CVE-2022-33742,
CVE-2022-33744

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1142.154
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1137.153
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