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CVE-2021-3716

Date: March 2, 2022

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.

Severity Score

Related Resources (10)

https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fd
https://listman.redhat.com/archives/libguestfs/2021-August/msg00083.html
https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8
https://access.redhat.com/security/cve/CVE-2021-3716
https://bugzilla.redhat.com/show_bug.cgi?id=1994695
https://nvd.nist.gov/vuln/detail/CVE-2021-3716
https://security-tracker.debian.org/tracker/CVE-2021-3716
https://www.openwall.com/lists/oss-security/2021/08/18/2
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3716
https://www.mend.io/vulnerability-database/CVE-2021-3716

Severity Score

Weakness Type (CWE)

Improper Enforcement of Message Integrity During Transmission in a Communication Channel

CWE-924

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): SINGLE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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