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Ubuntu Security Notice USN-5003-1

Ubuntu Security Notice USN-5003-1
Posted Jun 23, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5003-1 - Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, arbitrary, kernel, local, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2021-23133, CVE-2021-3600, CVE-2021-3609
SHA-256 | 454600fca920521d2f7dc91a8be4196b4e4b50958a1a84bbdc3fecdab0e71be6

Ubuntu Security Notice USN-5003-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-5003-1
June 23, 2021

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-oracle,
linux-raspi2, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-dell300x: Linux kernel for Dell 300x platforms
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code. (CVE-2021-3609)

It was discovered that the eBPF implementation in the Linux kernel did not
properly track bounds information for 32 bit registers when performing div
and mod operations. A local attacker could use this to possibly execute
arbitrary code. (CVE-2021-3600)

Or Cohen discovered that the SCTP implementation in the Linux kernel
contained a race condition in some situations, leading to a use-after-free
condition. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-23133)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1022-dell300x 4.15.0-1022.26
linux-image-4.15.0-1075-oracle 4.15.0-1075.83
linux-image-4.15.0-1089-raspi2 4.15.0-1089.94
linux-image-4.15.0-1103-gcp 4.15.0-1103.116
linux-image-4.15.0-1106-aws 4.15.0-1106.113
linux-image-4.15.0-1106-snapdragon 4.15.0-1106.115
linux-image-4.15.0-1118-azure 4.15.0-1118.131
linux-image-4.15.0-147-generic 4.15.0-147.151
linux-image-4.15.0-147-generic-lpae 4.15.0-147.151
linux-image-4.15.0-147-lowlatency 4.15.0-147.151
linux-image-aws-lts-18.04 4.15.0.1106.109
linux-image-azure-lts-18.04 4.15.0.1118.91
linux-image-dell300x 4.15.0.1022.24
linux-image-gcp-lts-18.04 4.15.0.1103.121
linux-image-generic 4.15.0.147.134
linux-image-generic-lpae 4.15.0.147.134
linux-image-lowlatency 4.15.0.147.134
linux-image-oracle-lts-18.04 4.15.0.1075.85
linux-image-raspi2 4.15.0.1089.86
linux-image-snapdragon 4.15.0.1106.109
linux-image-virtual 4.15.0.147.134

Ubuntu 16.04 ESM:
linux-image-4.15.0-1075-oracle 4.15.0-1075.83~16.04.1
linux-image-4.15.0-1103-gcp 4.15.0-1103.116~16.04.1
linux-image-4.15.0-1106-aws 4.15.0-1106.113~16.04.1
linux-image-4.15.0-1118-azure 4.15.0-1118.131~16.04.1
linux-image-4.15.0-147-generic 4.15.0-147.151~16.04.1
linux-image-4.15.0-147-lowlatency 4.15.0-147.151~16.04.1
linux-image-aws-hwe 4.15.0.1106.97
linux-image-azure 4.15.0.1118.109
linux-image-gcp 4.15.0.1103.104
linux-image-generic-hwe-16.04 4.15.0.147.143
linux-image-gke 4.15.0.1103.104
linux-image-lowlatency-hwe-16.04 4.15.0.147.143
linux-image-oem 4.15.0.147.143
linux-image-oracle 4.15.0.1075.63
linux-image-virtual-hwe-16.04 4.15.0.147.143

Ubuntu 14.04 ESM:
linux-image-4.15.0-1118-azure 4.15.0-1118.131~14.04.1
linux-image-azure 4.15.0.1118.91

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-5003-1
CVE-2021-23133, CVE-2021-3600, CVE-2021-3609

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-147.151
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1106.113
https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1118.131
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1022.26
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1103.116
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1075.83
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1089.94
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1106.115
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