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CVE-2020-28200

Publication date 21 June 2021

Last updated 11 September 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

4.3 · Medium

Score breakdown

The Sieve engine in Dovecot before 2.3.15 allows Uncontrolled Resource Consumption, as demonstrated by a situation with a complex regular expression for the regex extension.

Read the notes from the security team

Mitigation

Disabling the regex sieve extension avoids the worst problems. lmtp_user_concurrency_limit may also be helpful.

Status

Package Ubuntu Release Status
dovecot 24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish Ignored
21.04 hirsute Ignored
20.10 groovy Ignored
20.04 LTS focal Ignored
18.04 LTS bionic Ignored
16.04 LTS xenial Ignored
14.04 LTS trusty Ignored

Notes

mdeslaur

Per upstream, fixing this is a massive change that cannot be backported to earlier releases. As such, we will not be fixing this issue in older Ubuntu releases. Marking as ignored. For users of earlier releases, we recommend disabling the regex sieve extension.

Severity score breakdown

Parameter Value
Base score 4.3 · Medium
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact Low
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L