CVE-2021-23192

samba: Subsequent DCE/RPC fragment injection vulnerability

Severity Score

7.5

*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 the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.

Se ha encontrado un fallo en la forma en que samba implementa DCE/RPC. Si un cliente a un servidor Samba enviaba una petición DCE/RPC muy grande, y elegía fragmentarla, un atacante podía reemplazar los fragmentos posteriores con sus propios datos, omitiendo los requisitos de firma

Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. Andrew Bartlett discovered that Samba did not correctly sandbox Kerberos tickets issues by an RODC. An RODC could print administrator tickets, contrary to expectations. Various other issues were also addressed.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-10-20 CVE Reserved
2021-11-11 CVE Published
2024-08-03 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (5)

URL	Tag	Source
https://ubuntu.com/security/CVE-2021-23192	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://www.samba.org/samba/security/CVE-2021-23192.html	2023-09-17

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=2019666	2022-01-04
https://security.gentoo.org/glsa/202309-06	2023-09-17
https://access.redhat.com/security/cve/CVE-2021-23192	2022-01-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.10.0 < 4.13.14 Search vendor "Samba" for product "Samba" and version " >= 4.10.0 < 4.13.14"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.14.0 < 4.14.10 Search vendor "Samba" for product "Samba" and version " >= 4.14.0 < 4.14.10"		-		Affected
Samba Search vendor "Samba"		Samba Search vendor "Samba" for product "Samba"				>= 4.15.0 < 4.15.2 Search vendor "Samba" for product "Samba" and version " >= 4.15.0 < 4.15.2"		-		Affected