CVE-2021-21237

Git LFS can execute a Git binary from the current directory on Windows

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Git LFS is a command line extension for managing large files with Git. On Windows, if Git LFS operates on a malicious repository with a git.bat or git.exe file in the current directory, that program would be executed, permitting the attacker to execute arbitrary code. This does not affect Unix systems. This is the result of an incomplete fix for CVE-2020-27955. This issue occurs because on Windows, Go includes (and prefers) the current directory when the name of a command run does not contain a directory separator. Other than avoiding untrusted repositories or using a different operating system, there is no workaround. This is fixed in v2.13.2.

Git LFS es una extensión de línea de comandos para administrar archivos grandes con Git. En Windows, si Git LFS opera en un repositorio malicioso con un archivo git.bat o git.exe en el directorio actual, ese programa será ejecutado, permitiendo al atacante ejecutar código arbitrario. Esto no afecta a los sistemas Unix. Este es el resultado de una corrección incompleta para CVE-2020-27955. Este problema ocurre porque en Windows, Go incluye (y prefiere) el directorio actual cuando el nombre de un comando ejecutado no contiene un separador de directorio. Aparte de evitar los repositorios que no son confiables o usando un sistema operativo diferente, no se presenta una solución alternativa. Esto es corregido en versión v2.13.2

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-12-22 CVE Reserved
2021-01-15 CVE Published
2023-03-08 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-426: Untrusted Search Path

CAPEC

References (4)

URL	Tag	Source
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27955	Third Party Advisory
https://github.com/git-lfs/git-lfs/releases/tag/v2.13.2	Third Party Advisory
https://github.com/git-lfs/git-lfs/security/advisories/GHSA-cx3w-xqmc-84g5	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/git-lfs/git-lfs/commit/fc664697ed2c2081ee9633010de0a7f9debea72a	2021-01-29

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Git Large File Storage Project Search vendor "Git Large File Storage Project"		Git Large File Storage Search vendor "Git Large File Storage Project" for product "Git Large File Storage"				< 2.13.2 Search vendor "Git Large File Storage Project" for product "Git Large File Storage" and version " < 2.13.2"		-		Affected