Vulnerability identifier: #VU63360

Vulnerability risk: Low

CVSSv3.1: 7.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-3899

CWE-ID: CWE-362

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
apport (Ubuntu package)
Operating systems & Components / Operating system package or component
python3-apport (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor:

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition in the replaced executable detection. A local user can exploit the race and execute arbitrary code with root privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

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External links
http://ubuntu.com/security/notices/USN-5427-1

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.