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Test ID:1.3.6.1.4.1.25623.1.0.844985
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for linux (USN-5000-1)
Summary:The remote host is missing an update for the 'linux'; package(s) announced via the USN-5000-1 advisory.
Description:Summary:
The remote host is missing an update for the 'linux'
package(s) announced via the USN-5000-1 advisory.

Vulnerability Insight:
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 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 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 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 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 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 in the Linux kernels WiFi implementation
leading to accepting plaintext fragments. A physically proximate attacker
could use this issue to inject packets. (CVE-2020-26145)

Mathy Vanhoef discovered the Linux kernels WiFi implementation
leading to reassembling 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 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)

Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the
nfc implementation in the Linux ...

Description truncated. Please see the references for more information.

Affected Software/OS:
'linux' package(s) on Ubuntu 20.04 LTS, Ubuntu 18.04 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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