CVE-2021-23133

Severity CVSS v4.0:

Pending analysis

Type:

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Publication date:

22/04/2021

Last modified:

07/11/2023

Description

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.00 HIGH
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.00

Severity 3.x

HIGH

Vector 2.0

AV:L/AC:M/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 6.90 MEDIUM
Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C

Attack Vector (AV): Local
Attack Complexity (AC): Medium
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0

6.90

Severity 2.0

MEDIUM

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	4.10 (including)	4.14.232 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.189 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.114 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.32 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.11.16 (excluding)
cpe:2.3:o:fedoraproject:fedora:32:::::::*
cpe:2.3:o:fedoraproject:fedora:33:::::::*
cpe:2.3:o:fedoraproject:fedora:34:::::::*
cpe:2.3:o:debian:debian_linux:9.0:::::::*
cpe:2.3:a:netapp:cloud_backup:-:::::::*
cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:::::::*
cpe:2.3:o:broadcom:brocade_fabric_operating_system:-:::::::*
cpe:2.3:o:netapp:h410c_firmware:-:::::::*
cpe:2.3:h:netapp:h410c:-:::::::*
cpe:2.3:o:netapp:h300s_firmware:-:::::::*

To consult the complete list of CPE names with products and versions, see this page

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	4.10 (including)	4.14.232 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.189 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.114 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.32 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.11.16 (excluding)
cpe:2.3:o:fedoraproject:fedora:32:::::::*
cpe:2.3:o:fedoraproject:fedora:33:::::::*
cpe:2.3:o:fedoraproject:fedora:34:::::::*
cpe:2.3:o:debian:debian_linux:9.0:::::::*
cpe:2.3:a:netapp:cloud_backup:-:::::::*
cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:::::::*
cpe:2.3:o:broadcom:brocade_fabric_operating_system:-:::::::*
cpe:2.3:o:netapp:h410c_firmware:-:::::::*
cpe:2.3:h:netapp:h410c:-:::::::*
cpe:2.3:o:netapp:h300s_firmware:-:::::::*

CVE-2021-23133

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools