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Test ID:1.3.6.1.4.1.25623.1.0.844992
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for linux-kvm (USN-5000-2)
Summary:The remote host is missing an update for the 'linux-kvm'; package(s) announced via the USN-5000-2 advisory.
Description:Summary:
The remote host is missing an update for the 'linux-kvm'
package(s) announced via the USN-5000-2 advisory.

Vulnerability Insight:
USN-5000-1 fixed vulnerabilities in the Linux kernel for Ubuntu
20.04 LTS and the Linux HWE kernel for Ubuntu 18.04 LTS. This update
provides the corresponding updates for the Linux KVM kernel for Ubuntu
20.04 LTS.

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)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly enforce limits for pointer operations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-33200)

Mathy Vanhoef discovered that the Linux kernels WiFi implementation did
not properly clear received fragments from memory in some situations. A
physically proximate attacker could possibly use this issue to inject
packets or expose sensitive information. (CVE-2020-24586)

Mathy Vanhoef discovered that the Linux kernels WiFi implementation
incorrectly handled encrypted fragments. A physically proximate attacker
could possibly use this issue to decrypt fragments. (CVE-2020-24587)

Mathy Vanhoef discovered that the Linux kernels WiFi implementation
incorrectly handled certain malformed frames. If a user were tricked into
connecting to a malicious server, a physically proximate attacker could use
this issue to inject packets. (CVE-2020-24588)

Mathy Vanhoef discovered that the Linux kernels WiFi implementation
incorrectly handled EAPOL frames from unauthenticated senders. A physically
proximate attacker could inject malicious packets to cause a denial of
service (system crash). (CVE-2020-26139)

Mathy Vanhoef discovered that the Linux kernels WiFi implementation did
not properly verify certain fragmented frames. A physically proximate
attacker could possibly use this issue to inject or decrypt packets.
(CVE-2020-26141)

Mathy Vanhoef discovered that the Linux kernels WiFi implementation
accepted plaintext fragments in certain situations. A physically proximate
attacker could use this issue to inject packets. (CVE-2020-26145)

Mathy Vanhoef discovered that the Linux kernels WiFi implementation could
reassemble mixed encrypted and plaintext fragments. A physically proximate
attacker could possibly use this issue to inject packets or exfiltrate
selected fragments. (CVE-2020-26147)

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 ...

Description truncated. Please see the references for more information.

Affected Software/OS:
'linux-kvm' package(s) on Ubuntu 20.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
7.2

CVSS Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2021-3609
Common Vulnerability Exposure (CVE) ID: CVE-2021-3506
https://bugzilla.redhat.com/show_bug.cgi?id=1944298
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2520013.html
https://www.openwall.com/lists/oss-security/2021/03/28/2
https://lists.debian.org/debian-lts-announce/2021/06/msg00019.html
http://www.openwall.com/lists/oss-security/2021/05/08/1
CopyrightCopyright (C) 2021 Greenbone Networks GmbH

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