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Debian Security Advisory DSA 4120-1 (linux - security update)

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

4.7

CVSSv2 Vector

CVSSv2 Vector

AV:L/AC:M/Au:N/C:C/I:N/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

4 years ago

Modified

Modified

3 years ago

Summary

Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2017-5715 Multiple researchers have discovered a vulnerability in various processors supporting speculative execution, enabling an attacker controlling an unprivileged process to read memory from arbitrary addresses, including from the kernel and all other processes running on the system. This specific attack has been named Spectre variant 2 (branch target injection) and is mitigated in the Linux kernel for the Intel x86-64 architecture by using the retpoline compiler feature which allows indirect branches to be isolated from speculative execution. CVE-2017-5754 Multiple researchers have discovered a vulnerability in Intel processors, enabling an attacker controlling an unprivileged process to read memory from arbitrary addresses, including from the kernel and all other processes running on the system. This specific attack has been named Meltdown and is addressed in the Linux kernel on the powerpc/ppc64el architectures by flushing the L1 data cache on exit from kernel mode to user mode (or from hypervisor to kernel). This works on Power7, Power8 and Power9 processors. CVE-2017-13166 A bug in the 32-bit compatibility layer of the v4l2 IOCTL handling code has been found. Memory protections ensuring user-provided buffers always point to userland memory were disabled, allowing destination address to be in kernel space. This bug could be exploited by an attacker to overwrite kernel memory from an unprivileged userland process, leading to privilege escalation. CVE-2018-5750 An information leak has been found in the Linux kernel. The acpi_smbus_hc_add() prints a kernel address in the kernel log at every boot, which could be used by an attacker on the system to defeat kernel ASLR. Additionnaly to those vulnerability, some mitigations for CVE-2017-5753 are included in this release. CVE-2017-5753 Multiple researchers have discovered a vulnerability in various processors supporting speculative execution, enabling an attacker controlling an unprivileged process to read memory from arbitrary addresses, including from the kernel and all other processes running on the system. This specific attack has been named Spectre variant 1 (bounds-check bypass) and is mitigated in the Linux kernel architecture by identifying vulnerable code sections (array bounds checking followed by array access) and replacing the array access with the speculation-safe array_index_nospec() function. More use sites will be added over time.

Affected Software

Affected Software

linux on Debian Linux

Detection Method

Detection Method

This check tests the installed software version using the apt package manager.

Solution

Solution

For the stable distribution (stretch), these problems have been fixed in version 4.9.82-1+deb9u2. We recommend that you upgrade your linux packages. For the detailed security status of linux please refer to its security tracker page linked in the references.

Common Vulnerabilities and Exposures (CVE)

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1. Download Multipass

sudo snap install multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

3. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. If you don’t have it already, install Brew. Then, to install Multipass simply execute:

brew install --cask multipass

2. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04 && multipass shell mageni

2. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash

1. Download the installer for Windows

Note: You need Windows 10 Pro/Enterprise/Education v 1803 or later, or any Windows 10 with VirtualBox

2. Ensure your network is private

Make sure your local network is designated as private, otherwise Windows prevents Multipass from starting.

3. Run the installer

You need to allow the installer to gain Administrator privileges.

4. Launch a multipass instance

multipass launch -c 2 -m 6G -d 20G -n mageni 20.04

5. Log into the multipass instance

multipass shell mageni

6. Install Mageni

curl -sL https://www.mageni.net/installation | sudo bash