CVE-2021-26910

Severity Score

7.0

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Firejail before 0.9.64.4 allows attackers to bypass intended access restrictions because there is a TOCTOU race condition between a stat operation and an OverlayFS mount operation.

Firejail versiones anteriores a 0.9.64.4, permite a atacantes omitir las restricciones de acceso previstas porque se presenta una condición de carrera TOCTOU entre una operación de estadística y una operación de montaje OverlayFS

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

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

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-02-08 CVE Reserved
2021-02-08 CVE Published
2023-05-03 EPSS Updated
2024-08-03 CVE Updated
2024-08-03 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition

CAPEC

References (8)

URL	Tag	Source
https://github.com/netblue30/firejail/releases/tag/0.9.64.4	Release Notes
https://lists.debian.org/debian-lts-announce/2021/02/msg00015.html	Mailing List

URL	Date	SRC
http://www.openwall.com/lists/oss-security/2021/02/09/1	2024-08-03
https://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root	2024-08-03
https://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txt	2024-08-03

URL	Date	SRC
https://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834b	2022-05-23

URL	Date	SRC
https://security.gentoo.org/glsa/202105-19	2022-05-23
https://www.debian.org/security/2021/dsa-4849	2022-05-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Firejail Project Search vendor "Firejail Project"		Firejail Search vendor "Firejail Project" for product "Firejail"				< 0.9.64.4 Search vendor "Firejail Project" for product "Firejail" and version " < 0.9.64.4"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected