// For flags

CVE-2021-23240

sudo: symbolic link attack in SELinux-enabled sudoedit

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.

En la función selinux_edit_copy_tfiles en sudoedit en Sudo versiones anteriores a la 1.9.5, permite a un usuario local poco privilegiado obtener una propiedad del archivo y escalar unos privilegios reemplazando un archivo temporal con un enlace simbólico para un archivo objetivo arbitrario. Esto afecta el soporte de SELinux RBAC en modo permisivo. Las máquinas sin SELinux no son vulnerables

A race condition vulnerability was found in the temporary file handling of sudoedit's SELinux RBAC support. On systems where SELinux is enabled, this flaw allows a malicious user with sudoedit permissions to set the owner of an arbitrary file to the user ID of the target user, potentially leading to local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

*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
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-01-07 CVE Reserved
  • 2021-01-12 CVE Published
  • 2023-11-08 EPSS Updated
  • 2024-08-03 CVE Updated
  • 2024-08-03 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-59: Improper Link Resolution Before File Access ('Link Following')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Sudo Project
Search vendor "Sudo Project"
 Sudo
Search vendor "Sudo Project" for product "Sudo"
 < 1.8.32
Search vendor "Sudo Project" for product "Sudo" and version " < 1.8.32"
-
Affected
Sudo Project
Search vendor "Sudo Project"
 Sudo
Search vendor "Sudo Project" for product "Sudo"
 >= 1.9.0 < 1.9.5
Search vendor "Sudo Project" for product "Sudo" and version " >= 1.9.0 < 1.9.5"
-
Affected
Netapp
Search vendor "Netapp"
 Hci Management Node
Search vendor "Netapp" for product "Hci Management Node"
--
Affected
Netapp
Search vendor "Netapp"
 Solidfire
Search vendor "Netapp" for product "Solidfire"
--
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