Improper Enforcement of Message Integrity During Transmission in a Communication Channel Affecting virt-devel:rhel/libnbd package, versions <0:1.6.0-5.module+el8.6.0+14480+c0a3aa0f


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.11% (46th percentile)

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  • Snyk IDSNYK-RHEL8-VIRTDEVEL-4974189
  • published18 Aug 2021
  • disclosed16 Aug 2021

Introduced: 16 Aug 2021

CVE-2021-3716  (opens in a new tab)
CWE-924  (opens in a new tab)

How to fix?

Upgrade RHEL:8 virt-devel:rhel/libnbd to version 0:1.6.0-5.module+el8.6.0+14480+c0a3aa0f or higher.
This issue was patched in RHSA-2022:1759.

NVD Description

Note: Versions mentioned in the description apply only to the upstream virt-devel:rhel/libnbd package and not the virt-devel:rhel/libnbd package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.

CVSS Scores

version 3.1