// For flags

CVE-2021-3899

Ubuntu Security Notice USN-6894-1

Severity Score

7.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track*
*SSVC
Descriptions

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

Existe una condición de ejecución en la detección de 'ejecutable reemplazado' que, con la configuración local correcta, permite a un atacante ejecutar código arbitrario como root.

Muqing Liu and neoni discovered that Apport incorrectly handled detecting if an executable was replaced after a crash. A local attacker could possibly use this issue to execute arbitrary code as the root user. Gerrit Venema discovered that Apport incorrectly handled connections to Apport sockets inside containers. A local attacker could possibly use this issue to connect to arbitrary sockets as the root user.

*Credits: Muqing Liu from Singurlar Security Lab, neoni
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
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:Track*
Exploitation
None
Automatable
No
Tech. Impact
Total
* Organization's Worst-case Scenario
Timeline
  • 2021-10-23 CVE Reserved
  • 2022-05-17 CVE Published
  • 2023-05-08 First Exploit
  • 2024-08-19 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Canonical Ltd.
Search vendor "Canonical Ltd."
 Apport
Search vendor "Canonical Ltd." for product "Apport"
 < 2.21.0
Search vendor "Canonical Ltd." for product "Apport" and version " < 2.21.0"
en
Affected