CVE-2020-28407

Publication date 3 November 2023

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In swtpm before 0.4.2 and 0.5.x before 0.5.1, a local attacker may be able to overwrite arbitrary files via a symlink attack against a temporary file such as TMP2-00.permall.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
swtpm	22.04 LTS jammy	Not affected
	16.04 LTS xenial	Ignored end of standard support
	14.04 LTS trusty	Ignored end of standard support

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
swtpm	Upstream: 4cc42c0 Upstream: 634b629 Upstream: a03cbad Upstream: 5263002 Upstream: e621b21

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.1 · High

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	7.1 · High
Exploitability score	-
Impact score	-

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

References

Other references

https://www.cve.org/CVERecord?id=CVE-2020-28407