CVE-2021-3899

Published: Jun 3, 2024Modified: Jun 17, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: NVD

Description

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.

Affected (5)

Products: Canonical: Apport, Ubuntu Linux

Canonical

2 products

Apport

Ubuntu Linux

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Canonical Apport	Before 2.21.0

Configuration B

4 vulnerable

Vulnerable Software	Affected Versions
Canonical Ubuntu Linux	Version 18.04
Canonical Ubuntu Linux	Version 20.04
Canonical Ubuntu Linux	Version 21.10
Canonical Ubuntu Linux	Version 22.04

Related CWEs

CWE-367

Time-of-check Time-of-use (TOCTOU) Race Condition

The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check. This can cause the product to perform invalid actions when the resource is in an unexpected state.

References (6)

https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376

Source: security@ubuntu.com

Issue TrackingPatch

https://ubuntu.com/security/notices/USN-5427-1

Source: security@ubuntu.com

Vendor Advisory

https://www.cve.org/CVERecord?id=CVE-2021-3899

Source: security@ubuntu.com

Third Party Advisory

https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1948376

Source: af854a3a-2127-422b-91ae-364da2661108

Issue TrackingPatch

https://ubuntu.com/security/notices/USN-5427-1

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

https://www.cve.org/CVERecord?id=CVE-2021-3899

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party Advisory

Timeline

No history available yet.