CVE-2021-22864

Unsafe configuration options in GitHub Pages leading to remote code execution on GitHub Enterprise Server

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A remote code execution vulnerability was identified in GitHub Enterprise Server that could be exploited when building a GitHub Pages site. User-controlled configuration options used by GitHub Pages were not sufficiently restricted and made it possible to override environment variables leading to code execution on the GitHub Enterprise Server instance. To exploit this vulnerability, an attacker would need permission to create and build a GitHub Pages site on the GitHub Enterprise Server instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.0.3 and was fixed in 3.0.3, 2.22.9, and 2.21.17. This vulnerability was reported via the GitHub Bug Bounty program.

Se identificó una vulnerabilidad de ejecución de código remota en el servidor de GitHub Enterprise que podría explotarse al crear un sitio de páginas de GitHub. Las opciones de configuración controladas por el usuario que usaban las páginas de GitHub no estaban lo suficientemente restringidas y permitían anular las variables de entorno lo que conllevaría a una ejecución de código en la instancia del servidor de GitHub Enterprise. Para explotar esta vulnerabilidad, un atacante necesitaría permiso para crear y construir un sitio de páginas de GitHub en la instancia del servidor de GitHub Enterprise. Esta vulnerabilidad afectó a todas las versiones de GitHub Enterprise Server anteriores a 3.0.3 y se corrigió en versiones 3.0.3, 2.22.9 y 2.21.17. Esta vulnerabilidad se reportó por medio del programa GitHub Bug Bounty

*Credits: yvvdwf

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

2021-01-06 CVE Reserved
2021-03-23 CVE Published
2023-12-07 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')

CAPEC

References (3)

URL	Tag	Source
https://docs.github.com/en/enterprise-server%402.21/admin/release-notes#2.21.17	X_refsource_misc
https://docs.github.com/en/enterprise-server%402.22/admin/release-notes#2.22.9	X_refsource_misc
https://docs.github.com/en/enterprise-server%403.0/admin/release-notes#3.0.3	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"				>= 2.21.0 < 2.21.17 Search vendor "Github" for product "Enterprise Server" and version " >= 2.21.0 < 2.21.17"		-		Affected
Github Search vendor "Github"		Enterprise Server Search vendor "Github" for product "Enterprise Server"				>= 2.22.0 < 2.22.9 Search vendor "Github" for product "Enterprise Server" and version " >= 2.22.0 < 2.22.9"		-		Affected
Github Search vendor "Github"		Enterprise Server Search vendor "Github" for product "Enterprise Server"				>= 3.0.0 < 3.0.3 Search vendor "Github" for product "Enterprise Server" and version " >= 3.0.0 < 3.0.3"		-		Affected