CVE-2021-3716

nbdkit: NBD_OPT_STRUCTURED_REPLY injection on STARTTLS

Severity Score

3.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se ha encontrado un fallo en nbdkit debido al almacenamiento inapropiado en caché del estado de texto plano a través del límite de cifrado STARTTLS. Un atacante de tipo MitM podría usar este fallo para inyectar un texto plano NBD_OPT_STRUCTURED_REPLY antes de hacer proxy todo lo demás que un cliente envía al servidor, lo que podría conllevar a que el cliente termine la sesión NBD. La mayor amenaza de esta vulnerabilidad es la disponibilidad del sistema

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-18 CVE Reserved
2022-02-02 CVE Published
2023-09-23 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel

CAPEC

References (6)

URL	Tag	Source
https://www.openwall.com/lists/oss-security/2021/08/18/2	Mailing List

URL	Date	SRC

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1994695	2022-05-10
https://gitlab.com/nbdkit/nbdkit/-/commit/09a13dafb7bb3a38ab52eb5501cba786365ba7fd	2023-07-07
https://gitlab.com/nbdkit/nbdkit/-/commit/6c5faac6a37077cf2366388a80862bb00616d0d8	2023-07-07

URL	Date	SRC
https://listman.redhat.com/archives/libguestfs/2021-August/msg00083.html	2022-05-10
https://access.redhat.com/security/cve/CVE-2021-3716	2022-05-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Nbdkit Project Search vendor "Nbdkit Project"		Nbdkit Search vendor "Nbdkit Project" for product "Nbdkit"				>= 1.11.8 < 1.24.6 Search vendor "Nbdkit Project" for product "Nbdkit" and version " >= 1.11.8 < 1.24.6"		-		Affected
Nbdkit Project Search vendor "Nbdkit Project"		Nbdkit Search vendor "Nbdkit Project" for product "Nbdkit"				>= 1.25.1 < 1.26.5 Search vendor "Nbdkit Project" for product "Nbdkit" and version " >= 1.25.1 < 1.26.5"		-		Affected
Nbdkit Project Search vendor "Nbdkit Project"		Nbdkit Search vendor "Nbdkit Project" for product "Nbdkit"				>= 1.27.1 < 1.27.6 Search vendor "Nbdkit Project" for product "Nbdkit" and version " >= 1.27.1 < 1.27.6"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		advanced_virtualization		Affected