Dovecot up to 2.3.14 Sieve Engine resource consumption

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

A vulnerability, which was classified as problematic, has been found in Dovecot up to 2.3.14 (Mail Server Software). Affected by this issue is some unknown functionality of the component Sieve Engine. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-400. Impacted is availability. CVE summarizes:

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.

The weakness was disclosed 06/28/2021. The advisory is available at openwall.com. This vulnerability is handled as CVE-2020-28200 since 11/04/2020. The exploitation is known to be easy. The attack may be launched remotely. A simple authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

Upgrading to version 2.3.15 eliminates this vulnerability.

Productinfoedit

Type

Name

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfoedit

Class: Denial of service
CWE: CWE-400
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Dovecot 2.3.15

Timelineinfoedit

11/04/2020 CVE assigned
06/28/2021 +235 days Advisory disclosed
06/28/2021 +0 days VulDB entry created
07/03/2021 +5 days VulDB last update

Sourcesinfoedit

Advisory: openwall.com
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2020-28200 (🔒)

Entryinfoedit

Created: 06/28/2021 06:18 PM
Updated: 07/03/2021 04:40 AM
Changes: (1) source_cve_cna
Complete: 🔍

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