CVE-2021-22865

Improper access control in GitHub Enterprise Server leading to unauthorized read access to private repository metadata

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An improper access control vulnerability was identified in GitHub Enterprise Server that allowed access tokens generated from a GitHub App's web authentication flow to read private repository metadata via the REST API without having been granted the appropriate permissions. To exploit this vulnerability, an attacker would need to create a GitHub App on the instance and have a user authorize the application through the web authentication flow. The private repository metadata returned would be limited to repositories owned by the user the token identifies. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.0.4 and was fixed in versions 3.0.4, 2.22.10, 2.21.18. This vulnerability was reported via the GitHub Bug Bounty program.

Se identificó una vulnerabilidad de control de acceso inapropiado en GitHub Enterprise Server que permitía que los tokens de acceso generados a partir del flujo de autenticación web de una aplicación GitHub leyeran metadatos del repositorio privado por medio de la API REST sin haber recibido los permisos apropiados. Para explotar esta vulnerabilidad, un atacante necesitaría crear una aplicación GitHub en la instancia y hacer que un usuario autorizara la aplicación mediante el flujo de autenticación web. Los metadatos del repositorio privado devueltos se limitarían a los repositorios propiedad del usuario que identifica el token. Esta vulnerabilidad afectó a todas las versiones de GitHub Enterprise Server anteriores a la 3.0.4 y fue corregido en versiones 3.0.4, 2.22.10, 2.21.18. Esta vulnerabilidad se reportó por medio del programa GitHub Bug Bounty.

*Credits: djcruz93

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-06 CVE Reserved
2021-04-02 CVE Published
2023-12-17 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-285: Improper Authorization

CAPEC

References (3)

URL	Tag	Source
https://docs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.18	X_refsource_misc
https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.10	X_refsource_misc
https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.4	X_refsource_misc

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Github Search vendor "Github"		Enterprise Server Search vendor "Github" for product "Enterprise Server"				< 2.21.18 Search vendor "Github" for product "Enterprise Server" and version " < 2.21.18"		-		Affected
Github Search vendor "Github"		Enterprise Server Search vendor "Github" for product "Enterprise Server"				>= 2.22.0 < 2.22.10 Search vendor "Github" for product "Enterprise Server" and version " >= 2.22.0 < 2.22.10"		-		Affected
Github Search vendor "Github"		Enterprise Server Search vendor "Github" for product "Enterprise Server"				>= 3.0.0 < 3.0.4 Search vendor "Github" for product "Enterprise Server" and version " >= 3.0.0 < 3.0.4"		-		Affected