CVE-2021-20286 : A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt

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.

Published 2021-03-15 18:15:18

Updated 2021-03-22 14:32:46

Source Red Hat, Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2021-20286

Redhat » Enterprise Linux » Version: 8.3.0 Advanced Virtualization Edition
cpe:2.3:o:redhat:enterprise_linux:8.3.0:*:*:*:advanced_virtualization:*:*:*
Matching versions
Redhat » Libnbd
Versions before (<) 1.7.3
cpe:2.3:a:redhat:libnbd:*:*:*:*:*:*:*:*
Matching versions

EPSS FAQ

0.08%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 31 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.0	MEDIUM	AV:N/AC:L/Au:S/C:N/I:N/A:P	8.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: Single Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
2.7	LOW	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L	1.2	1.4	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: High User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: Low

CWE-617 Reachable Assertion

The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Assigned by: secalert@redhat.com (Primary)

https://gitlab.com/nbdkit/libnbd/-/commit/fb4440de9cc76e9c14bd3ddf3333e78621f40ad0

opt_go: Tolerate unplanned server death (fb4440de) · Commits · nbdkit / libnbd · GitLab
Patch;Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1934727

1934727 – (CVE-2021-20286) CVE-2021-20286 libnbd: Assertion failure in nbd_unlocked_opt_go in lib/opt.c
Issue Tracking;Third Party Advisory

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