Vulnerability CVE-2021-20286

Vulnerability Name:

CVE-2021-20286 (CCN-198272)

Assigned:

2020-12-17

Published:

2021-03-15

Updated:

2021-03-22

Summary:

A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.

CVSS v3 Severity:

2.7 Low (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L)
2.4 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): High User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Low

7.5 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)

Exploitability Metrics:	Attack Vector (AV): Network Attack Complexity (AC): Low Privileges Required (PR): None User Interaction (UI): None
Scope:	Scope (S): Unchanged
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): High

CVSS v2 Severity:

4.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Authentication (Au): Single_Instance
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Partial

7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)

Exploitability Metrics:	Access Vector (AV): Network Access Complexity (AC): Low Athentication (Au): None
Impact Metrics:	Confidentiality (C): None Integrity (I): None Availibility (A): Complete

Vulnerability Type:

CWE-617

Vulnerability Consequences:

Denial of Service

References:

Source: MITRE
Type: CNA
CVE-2021-20286

Source: CCN
Type: Red Hat Bugzilla - Bug 1934727
(CVE-2021-20286) - CVE-2021-20286 libnbd: Assertion failure in nbd_unlocked_opt_go in lib/opt.c

Source: MISC
Type: Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1934727

Source: XF
Type: UNKNOWN
nbdkit-cve202120286-dos(198272)

Source: CCN
Type: libnbd GIT Repository
opt_go: Tolerate unplanned server death

Source: MISC
Type: Patch, Third Party Advisory
https://gitlab.com/nbdkit/libnbd/-/commit/fb4440de9cc76e9c14bd3ddf3333e78621f40ad0

Vulnerable Configuration:

Configuration 1:

cpe:/a:redhat:libnbd:*:*:*:*:*:*:*:* (Version < 1.7.3)

OR cpe:/o:redhat:enterprise_linux:8.3.0:*:*:*:advanced_virtualization:*:*:*

Denotes that component is vulnerable

Oval Definitions

Definition ID	Class	Title	Last Modified
oval:org.opensuse.security:def:3795	P	Security update for MozillaThunderbird (Important) (in QA)	2022-08-01
oval:org.opensuse.security:def:6085	P	Security update for python (Important)	2022-07-04
oval:org.opensuse.security:def:3802	P	tar-1.27.1-15.3.7 on GA media (Moderate)	2022-06-28
oval:org.opensuse.security:def:94711	P	libspeex1-1.2-3.3.1 on GA media (Moderate)	2022-06-22
oval:org.opensuse.security:def:112716	P	libnbd-1.9.3-1.2 on GA media (Moderate)	2022-01-17
oval:org.opensuse.security:def:106189	P	libnbd-1.9.3-1.2 on GA media (Moderate)	2021-10-01
oval:org.opensuse.security:def:117604	P	Security update for kubevirt (Moderate)	2021-07-21
oval:org.opensuse.security:def:64884	P	Security update for kubevirt (Moderate)	2021-07-21
oval:org.opensuse.security:def:101424	P	Security update for kubevirt (Moderate)	2021-07-21
oval:org.opensuse.security:def:108090	P	Security update for kubevirt (Moderate)	2021-07-21
oval:org.opensuse.security:def:111613	P	Security update for kubevirt (Moderate)	2021-07-11
oval:org.opensuse.security:def:64891	P	Security update for kubevirt (Moderate)	2021-07-09
oval:org.opensuse.security:def:101679	P	Security update for kubevirt (Moderate)	2021-07-09
oval:org.opensuse.security:def:76242	P	Security update for kubevirt (Moderate)	2021-07-08
oval:org.opensuse.security:def:67174	P	Security update for kubevirt (Moderate)	2021-07-08

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