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Debian DSA-4941-1 : linux - security update

high Nessus Plugin ID 151890

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-4941 advisory.

 Several vulnerabilities have been discovered in the Linux kernel that may lead to a privilege escalation, denial of service or information leaks. CVE-2020-36311 A flaw was discovered in the KVM subsystem for AMD CPUs, allowing an attacker to cause a denial of service by triggering destruction of a large SEV VM.
 CVE-2021-3609 Norbert Slusarek reported a race condition vulnerability in the CAN BCM networking protocol, allowing a local attacker to escalate privileges. CVE-2021-33909 The Qualys Research Labs discovered a size_t-to-int conversion vulnerability in the Linux kernel's filesystem layer. An unprivileged local attacker able to create, mount, and then delete a deep directory structure whose total path length exceeds 1GB, can take advantage of this flaw for privilege escalation. Details can be found in the Qualys advisory at https://www.qualys.com/2021/07/20/cve-2021-33909/sequoia-local-privilege-escalation-linux.txt CVE-2021-34693 Norbert Slusarek discovered an information leak in the CAN BCM networking protocol. A local attacker can take advantage of this flaw to obtain sensitive information from kernel stack memory. For the stable distribution (buster), these problems have been fixed in version 4.19.194-3. We recommend that you upgrade your linux packages. For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the linux packages.

For the stable distribution (buster), these problems have been fixed in version 4.19.194-3.

See Also

https://security-tracker.debian.org/tracker/source-package/linux

https://www.debian.org/security/2021/dsa-4941

https://security-tracker.debian.org/tracker/CVE-2020-36311

https://security-tracker.debian.org/tracker/CVE-2021-33909

https://security-tracker.debian.org/tracker/CVE-2021-34693

https://security-tracker.debian.org/tracker/CVE-2021-3609

https://packages.debian.org/source/buster/linux

Plugin Details

Severity: High

ID: 151890

File Name: debian_DSA-4941.nasl

Version: 1.6

Type: local

Agent: unix

Published: 7/21/2021

Updated: 1/24/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.9

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2021-33909

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-amd64-dbg, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-armmp-lpae, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-686-pae-dbg, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-cloud-amd64-unsigned, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-armmp, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-s390x, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-arm64, p-cpe:/a:debian:debian_linux:linux-support-4.19.0-14, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-arm64-unsigned, p-cpe:/a:debian:debian_linux:linux-compiler-gcc-8-arm, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-marvell, p-cpe:/a:debian:debian_linux:libbpf4.19, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-686-pae, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-686-pae-unsigned, p-cpe:/a:debian:debian_linux:linux-image-arm64-signed-template, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-686-pae-dbg, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-cloud-amd64-dbg, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-s390x, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-armmp-dbg, p-cpe:/a:debian:debian_linux:linux-compiler-gcc-8-s390, p-cpe:/a:debian:debian_linux:usbip, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rpi, p-cpe:/a:debian:debian_linux:linux-image-i386-signed-template, p-cpe:/a:debian:debian_linux:linux-doc-4.19, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-powerpc64le, p-cpe:/a:debian:debian_linux:linux-source-4.19, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-armhf, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-rt-686-pae, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-686, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-octeon-dbg, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-rt-arm64, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-arm64-unsigned, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-amd64, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-amd64, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-4kc-malta-dbg, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-armmp-lpae-dbg, p-cpe:/a:debian:debian_linux:lockdep, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-s390x-dbg, p-cpe:/a:debian:debian_linux:linux-cpupower, p-cpe:/a:debian:debian_linux:liblockdep-dev, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-loongson-3, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-armmp-lpae, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-s390x, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-arm64, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-common-rt, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-5kc-malta, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-mipsel, p-cpe:/a:debian:debian_linux:libcpupower1, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-loongson-3, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-i386, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-loongson-3-dbg, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rpi-dbg, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-arm64-dbg, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-mips64el, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-686-unsigned, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-5kc-malta, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-amd64-unsigned, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-common, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-686-pae-unsigned, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-octeon, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-arm64-dbg, p-cpe:/a:debian:debian_linux:linux-libc-dev, p-cpe:/a:debian:debian_linux:linux-perf-4.19, p-cpe:/a:debian:debian_linux:linux-image-amd64-signed-template, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-rt-armmp, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-rt-amd64, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-armmp, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-marvell, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-mips, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-4kc-malta, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-686-dbg, p-cpe:/a:debian:debian_linux:linux-config-4.19, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-powerpc64le-dbg, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-ppc64el, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-5kc-malta-dbg, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-octeon, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-rpi, p-cpe:/a:debian:debian_linux:linux-kbuild-4.19, p-cpe:/a:debian:debian_linux:libcpupower-dev, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-marvell-dbg, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-4kc-malta, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-cloud-amd64, p-cpe:/a:debian:debian_linux:linux-headers-4.19.0-14-all-armel, p-cpe:/a:debian:debian_linux:libbpf-dev, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-amd64-dbg, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-powerpc64le, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-armmp-dbg, p-cpe:/a:debian:debian_linux:linux-compiler-gcc-8-x86, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-armmp, p-cpe:/a:debian:debian_linux:hyperv-daemons, p-cpe:/a:debian:debian_linux:linux-image-4.19.0-14-rt-amd64-unsigned, p-cpe:/a:debian:debian_linux:liblockdep4.19

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/20/2021

Vulnerability Publication Date: 4/7/2021

Reference Information

CVE: CVE-2020-36311, CVE-2021-33909, CVE-2021-34693, CVE-2021-3609

IAVA: 2021-A-0350