CVE-2020-25721

Gentoo Linux Security Advisory 202309-06

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Kerberos acceptors need easy access to stable AD identifiers (eg objectSid). Samba as an AD DC now provides a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets.

Los aceptadores de Kerberos necesitan un acceso fácil a los identificadores estables de AD (por ejemplo, objectSid). Samba como un DC AD ahora proporciona una manera para que las aplicaciones de Linux para obtener un SID confiable (y samAccountName) en los boletos emitidos

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-09-16 CVE Reserved
2021-11-11 CVE Published
2024-08-04 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation

CAPEC

References (4)

URL	Tag	Source
https://bugzilla.redhat.com/show_bug.cgi?id=2021728	Issue Tracking

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://bugzilla.samba.org/show_bug.cgi?id=14725	2023-09-17
https://security.gentoo.org/glsa/202309-06	2023-09-17
https://www.samba.org/samba/security/CVE-2020-25721.html	2023-09-17

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"				>= 4.13.0 < 4.13.14 Search vendor "Samba" for product "Samba" and version " >= 4.13.0 < 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