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AUSCERT External Security Bulletin Redistribution
ESB-2021.2220
USN-5001-1: Linux kernel (OEM) vulnerabilities
24 June 2021
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AusCERT Security Bulletin Summary
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Product: linux kernel (OEM)
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands — Remote/Unauthenticated
Root Compromise — Existing Account
Denial of Service — Remote/Unauthenticated
Access Confidential Data — Remote/Unauthenticated
Reduced Security — Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-33034 CVE-2021-32399 CVE-2021-31440
CVE-2021-23134 CVE-2021-23133 CVE-2021-3609
CVE-2021-3543 CVE-2021-3506 CVE-2020-26147
CVE-2020-26145 CVE-2020-26141 CVE-2020-26139
CVE-2020-24588 CVE-2020-24587 CVE-2020-24586
Reference: ESB-2021.2216
ESB-2021.2180
ESB-2021.2136
ESB-2021.2219
Original Bulletin:
https://ubuntu.com/security/notices/USN-5001-1
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USN-5001-1: Linux kernel (OEM) vulnerabilities
23 June 2021
Several security issues were fixed in the Linux kernel.
Releases
o Ubuntu 20.04 LTS
Packages
o linux-oem-5.10 – Linux kernel for OEM systems
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 )
Mathy Vanhoef discovered that the Linux kernel’s 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 kernel’s 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 kernel’s 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 kernel’s 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 kernel’s 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 in the Linux kernel’s WiFi implementation
leading to accepting plaintext fragments. A physically proximate attacker
could use this issue to inject packets. ( CVE-2020-26145 )
Mathy Vanhoef discovered that the the Linux kernel’s 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 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 )
Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the
nfc implementation in the Linux kernel. A privileged local attacker could
use this issue to cause a denial of service (system crash) or possibly
execute arbitrary code. ( CVE-2021-23134 )
Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF)
implementation in the Linux kernel contained an out-of-bounds
vulnerability. A local attacker could use this issue to execute arbitrary
code. ( CVE-2021-31440 )
It was discovered that a race condition in the kernel Bluetooth subsystem
can lead to use-after-free of slab objects. An attacker could use this
issue to possibly execute arbitrary code. ( CVE-2021-32399 )
It was discovered that a use-after-free existed in the Bluetooth HCI driver
of the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. ( CVE-2021-33034 )
It was discovered that an out-of-bounds (OOB) memory access flaw in the
f2fs module of the Linux kernel. A local attacker could use this issue to
cause a denial of service (system crash). ( CVE-2021-3506 )
Mathias Krause discovered that a null pointer dereference existed in the
Nitro Enclaves kernel driver of the Linux kernel. A local attacker could
use this issue to cause a denial of service or possibly execute arbitrary
code. ( CVE-2021-3543 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o linux-image-5.10.0-1033-oem – 5.10.0-1033.34
o linux-image-oem-20.04b – 5.10.0.1033.34
o linux-image-oem-20.04 – 5.10.0.1033.34
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
o CVE-2021-31440
o CVE-2020-26141
o CVE-2021-3609
o CVE-2021-23134
o CVE-2021-3543
o CVE-2020-26145
o CVE-2020-24586
o CVE-2020-26147
o CVE-2021-32399
o CVE-2021-23133
o CVE-2020-24587
o CVE-2020-26139
o CVE-2020-24588
o CVE-2021-3506
o CVE-2021-33034
Related notices
o USN-4997-1 : linux-azure, linux-image-raspi-nolpae, linux-aws,
linux-image-lowlatency, linux-image-raspi, linux-raspi,
linux-image-5.11.0-1011-aws, linux-image-5.11.0-1011-gcp,
linux-image-5.11.0-22-generic-lpae, linux-image-virtual-hwe-20.04-edge,
linux-image-5.11.0-1009-azure, linux-image-lowlatency-hwe-20.04,
linux-image-5.11.0-1012-raspi-nolpae, linux-image-generic-hwe-20.04,
linux-image-gke, linux-image-azure, linux-image-oracle,
linux-image-generic-64k-hwe-20.04, linux-image-generic-64k-hwe-20.04-edge,
linux-image-generic-hwe-20.04-edge, linux-image-generic-lpae-hwe-20.04,
linux-image-5.11.0-1012-raspi, linux-image-5.11.0-22-generic-64k,
linux-image-generic, linux, linux-image-lowlatency-hwe-20.04-edge,
linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.11.0-22-generic,
linux-gcp, linux-image-oem-20.04, linux-image-virtual-hwe-20.04,
linux-oracle, linux-image-virtual, linux-image-generic-64k,
linux-image-gcp, linux-image-aws, linux-image-generic-lpae,
linux-image-5.11.0-1010-oracle, linux-image-5.11.0-22-lowlatency
o USN-4999-1 : linux-azure, linux-hwe-5.8, linux-image-5.8.0-1030-kvm,
linux-image-raspi-nolpae, linux-aws, linux-image-kvm,
linux-image-lowlatency, linux-image-raspi, linux-gcp-5.8, linux-raspi,
linux-image-aws, linux-image-oracle-edge, linux-kvm,
linux-image-virtual-hwe-20.04-edge, linux-oracle-5.8,
linux-image-lowlatency-hwe-20.04, linux-image-generic-hwe-20.04,
linux-image-5.8.0-59-lowlatency, linux-image-gke, linux-image-azure,
linux-image-oracle, linux-image-generic-64k-hwe-20.04-edge,
linux-image-5.8.0-1029-raspi, linux-image-generic-hwe-20.04-edge,
linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-59-generic,
linux-image-gcp-edge, linux-aws-5.8, linux-image-generic,
linux-image-5.8.0-1035-gcp, linux-image-lowlatency-hwe-20.04-edge,
linux-image-generic-lpae-hwe-20.04-edge, linux-gcp, linux-image-oem-20.04,
linux-image-virtual-hwe-20.04, linux-image-5.8.0-59-generic-64k,
linux-image-5.8.0-1029-raspi-nolpae, linux-oracle, linux-image-virtual,
linux-image-generic-64k, linux-image-5.8.0-1033-oracle,
linux-image-5.8.0-1036-azure, linux-image-azure-edge, linux-image-gcp,
linux-azure-5.8, linux-image-5.8.0-1038-aws,
linux-image-5.8.0-59-generic-lpae, linux-image-generic-lpae, linux,
linux-image-generic-64k-hwe-20.04
o USN-5000-1 : linux-image-oracle-lts-20.04, linux-azure,
linux-image-raspi2-hwe-18.04, linux-image-5.4.0-77-generic-lpae,
linux-image-5.4.0-1046-gke, linux-image-virtual-hwe-18.04-edge, linux-aws,
linux-image-gkeop, linux-image-lowlatency-hwe-18.04, linux-image-oem,
linux-azure-5.4, linux-image-generic-lpae, linux-image-lowlatency,
linux-image-raspi, linux-image-5.4.0-1048-oracle,
linux-image-5.4.0-77-generic, linux-image-raspi-hwe-18.04, linux-image-aws,
linux-raspi, linux-image-5.4.0-1051-azure,
linux-image-lowlatency-hwe-18.04-edge, linux-image-oracle-edge,
linux-image-raspi2-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04-edge,
linux-image-raspi-hwe-18.04-edge, linux-image-5.4.0-1038-raspi,
linux-image-generic-lpae-hwe-18.04-edge, linux-image-aws-lts-20.04,
linux-image-generic-hwe-18.04, linux-gke-5.4, linux-image-raspi2,
linux-image-gke, linux-image-azure, linux-image-oracle,
linux-image-virtual-hwe-18.04, linux-gkeop-5.4, linux-image-gcp-lts-20.04,
linux-image-gkeop-5.4, linux-image-gke-5.4, linux-image-gcp-edge,
linux-image-generic-lpae-hwe-18.04, linux-image-generic, linux-oracle-5.4,
linux-gcp, linux-aws-5.4, linux-image-5.4.0-77-lowlatency, linux-gkeop,
linux-image-5.4.0-1046-gcp, linux-image-azure-lts-20.04, linux-oracle,
linux-image-virtual, linux-image-azure-edge,
linux-image-generic-hwe-18.04-edge, linux-image-gcp, linux-image-aws-edge,
linux-raspi-5.4, linux-hwe-5.4, linux-gke, linux-image-oem-osp1,
linux-image-snapdragon-hwe-18.04, linux-gcp-5.4,
linux-image-5.4.0-1051-aws, linux, linux-image-5.4.0-1018-gkeop
o USN-5002-1 : linux-raspi2-5.3, linux-gke-5.3, linux-image-gke-5.3,
linux-image-raspi2-hwe-18.04, linux-image-5.3.0-75-generic,
linux-image-5.3.0-75-lowlatency, linux-image-gkeop-5.3,
linux-image-5.3.0-1044-gke, linux-image-5.3.0-1041-raspi2, linux-hwe
o USN-5003-1 : linux-image-generic-hwe-16.04-edge, linux-aws-hwe,
linux-azure, linux-image-generic-hwe-16.04, linux-image-snapdragon,
linux-image-lowlatency-hwe-16.04-edge, linux-snapdragon,
linux-image-azure-lts-18.04, linux-azure-4.15, linux-image-oem,
linux-image-lowlatency, linux-image-4.15.0-147-generic,
linux-image-4.15.0-1103-gcp, linux-image-aws-lts-18.04, linux-gcp-4.15,
linux-image-4.15.0-1022-dell300x, linux-image-raspi2, linux-image-aws-hwe,
linux-image-gke, linux-image-azure, linux-image-virtual-hwe-16.04-edge,
linux-image-oracle, linux-image-generic-lpae-hwe-16.04-edge,
linux-image-4.15.0-1118-azure, linux-image-lowlatency-hwe-16.04,
linux-image-virtual-hwe-16.04, linux-image-gcp-lts-18.04,
linux-image-generic, linux-image-4.15.0-1089-raspi2,
linux-image-4.15.0-1106-snapdragon, linux-gcp,
linux-image-4.15.0-147-generic-lpae, linux-image-4.15.0-147-lowlatency,
linux-image-dell300x, linux-image-4.15.0-1106-aws, linux-oracle,
linux-image-virtual, linux-image-oracle-lts-18.04, linux-dell300x,
linux-image-azure-edge, linux-image-gcp,
linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1075-oracle,
linux-raspi2, linux-aws, linux-image-generic-lpae, linux, linux-hwe
– ————————–END INCLUDED TEXT——————–
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
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