medium
6.5
CWE
354
Advisory Published
CVE Published
CVE Published
Updated

CVE-2021-3772

First published: Thu Sep 02 2021(Updated: )

A flaw was found in the Linux SCTP stack. A blind attacker may be able to kill an existing SCTP association through invalid chunks if the attacker knows the IP-addresses and port numbers being used and the attacker can send packets with spoofed IP addresses.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel-rt<0:4.18.0-372.9.1.rt7.166.el8
0:4.18.0-372.9.1.rt7.166.el8
redhat/kernel<0:4.18.0-372.9.1.el8
0:4.18.0-372.9.1.el8
Linux Kernel<5.15.0
Red Hat Enterprise Linux=8.0
Debian Linux=9.0
Debian Linux=10.0
Oracle Communications Cloud Native Core Binding Support Function=22.1.3
Oracle Communications Cloud Native Core Network Exposure Function=22.1.1
Oracle Communications Cloud Native Core Policy=22.2.0
NetApp E-Series SANtricity OS Controller=11.0
NetApp E-Series SANtricity OS Controller=11.0.0
NetApp E-Series SANtricity OS Controller=11.20
NetApp E-Series SANtricity OS Controller=11.25
NetApp E-Series SANtricity OS Controller=11.30
NetApp E-Series SANtricity OS Controller=11.30.5r3
NetApp E-Series SANtricity OS Controller=11.40
NetApp E-Series SANtricity OS Controller=11.40.3r2
NetApp E-Series SANtricity OS Controller=11.40.5
NetApp E-Series SANtricity OS Controller=11.50.1
NetApp E-Series SANtricity OS Controller=11.50.2
NetApp E-Series SANtricity OS Controller=11.50.2-p1
NetApp E-Series SANtricity OS Controller=11.60
NetApp E-Series SANtricity OS Controller=11.60.0
NetApp E-Series SANtricity OS Controller=11.60.1
NetApp E-Series SANtricity OS Controller=11.60.3
NetApp E-Series SANtricity OS Controller=11.70.1
NetApp E-Series SANtricity OS Controller=11.70.2
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node
NetApp HCI Compute Node
All of
NetApp H300S Firmware
NetApp H300S Firmware
All of
NetApp H500e Firmware
NetApp H500e Firmware
All of
NetApp H700S
NetApp H700S
All of
NetApp H410S
NetApp H410S Firmware
All of
NetApp H410C
NetApp H410C Firmware
All of
NetApp H610C
NetApp H610C Firmware
All of
NetApp HCI H610S Firmware
NetApp H610S Firmware
All of
NetApp H615C
NetApp H615C
NetApp H300S Firmware
NetApp H300S Firmware
NetApp H500e Firmware
NetApp H500e Firmware
NetApp H700S
NetApp H700S
NetApp H410S
NetApp H410S Firmware
NetApp H410C
NetApp H410C Firmware
NetApp H610C
NetApp H610C Firmware
NetApp HCI H610S Firmware
NetApp H610S Firmware
NetApp H615C
NetApp H615C
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.128-1
6.12.20-1
6.12.21-1

Remedy

As the SCTP module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: if # echo "install sctp /bin/true" >> /etc/modprobe.d/disable-sctp.conf The system will need to be restarted if the SCTP modules are loaded. In most circumstances, the SCTP kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use. If the system requires this module to work correctly, this mitigation may not be suitable. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2000694

Remedy

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=32f8807a48ae55be0e76880cfe8607a18b5bb0df

Remedy

https://github.com/torvalds/linux/commit/32f8807a48ae55be0e76880cfe8607a18b5bb0df

Remedy

https://ubuntu.com/security/CVE-2021-3772

Remedy

https://www.oracle.com/security-alerts/cpujul2022.html

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2021-3772?

    CVE-2021-3772 is classified as a medium severity vulnerability due to its potential to disrupt existing SCTP associations.

  • How do I fix CVE-2021-3772?

    To remediate CVE-2021-3772, upgrade to the recommended kernel versions provided by your Linux distribution vendor.

  • Who is affected by CVE-2021-3772?

    CVE-2021-3772 affects various Linux kernel versions, specifically those prior to specified patched versions from Red Hat and Debian.

  • What type of attack does CVE-2021-3772 enable?

    CVE-2021-3772 allows a blind attacker to potentially terminate existing SCTP associations through the use of malicious packets.

  • Which Linux distributions are impacted by CVE-2021-3772?

    CVE-2021-3772 impacts Red Hat Enterprise Linux, Debian, and other distributions using vulnerable Linux kernel versions.

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