CVE-2021-20271

rpm: Signature checks bypass via corrupted rpm package

Severity Score

7.0

*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 RPM's signature check functionality when reading a package file. This flaw allows an attacker who can convince a victim to install a seemingly verifiable package, whose signature header was modified, to cause RPM database corruption and execute code. The highest threat from this vulnerability is to data integrity, confidentiality, and system availability.

Se detectó un fallo en la funcionalidad de comprobación de firmas de RPM cuando se lee un archivo de paquete. Este fallo permite a un atacante que pueda convencer a una víctima de instalar un paquete aparentemente verificable, cuyo encabezado de firma fue modificado, causar una corrupción de la base de datos de RPM y ejecutar código. La mayor amenaza de esta vulnerabilidad es la integridad de los datos, la confidencialidad y la disponibilidad del sistema.

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-17 CVE Reserved
2021-03-26 CVE Published
2023-12-10 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-345: Insufficient Verification of Data Authenticity

CAPEC

References (8)

URL	Tag	Source
https://www.starwindsoftware.com/security/sw-20220805-0002	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1934125	2021-12-07
https://github.com/rpm-software-management/rpm/commit/d6a86b5e69e46cc283b1e06c92343319beb42e21	2023-02-12

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TMGXO3W6DHPO62GJ4VVF5DEUX5DRUR5K	2023-02-12
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VHRPNBCRPDJHHQE3MBPSZK4H7X2IM7AC	2023-02-12
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YILPBTPSBRYL4POBI3F4YUSVPSOQNJBY	2023-02-12
https://security.gentoo.org/glsa/202107-43	2023-02-12
https://access.redhat.com/security/cve/CVE-2021-20271	2021-12-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				>= 4.15.0 < 4.15.1.3 Search vendor "Rpm" for product "Rpm" and version " >= 4.15.0 < 4.15.1.3"		-		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				>= 4.16.0 < 4.16.1.3 Search vendor "Rpm" for product "Rpm" and version " >= 4.16.0 < 4.16.1.3"		-		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				4.15.0 Search vendor "Rpm" for product "Rpm" and version "4.15.0"		alpha		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				4.15.0 Search vendor "Rpm" for product "Rpm" and version "4.15.0"		beta1		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				4.15.0 Search vendor "Rpm" for product "Rpm" and version "4.15.0"		rc1		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				4.16.0 Search vendor "Rpm" for product "Rpm" and version "4.16.0"		alpha		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				4.16.0 Search vendor "Rpm" for product "Rpm" and version "4.16.0"		beta2		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				4.16.0 Search vendor "Rpm" for product "Rpm" and version "4.16.0"		beta3		Affected
Rpm Search vendor "Rpm"		Rpm Search vendor "Rpm" for product "Rpm"				4.16.0 Search vendor "Rpm" for product "Rpm" and version "4.16.0"		rc1		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
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected
Starwindsoftware Search vendor "Starwindsoftware"		Starwind Virtual San Search vendor "Starwindsoftware" for product "Starwind Virtual San"				v8 Search vendor "Starwindsoftware" for product "Starwind Virtual San" and version "v8"		build14398		Affected