Dovecot up to 2.2.36.0/2.3.4.0 Certificate Username Impersonation certificate validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.8	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Dovecot up to 2.2.36.0/2.3.4.0. It has been classified as critical. This issue affects some unknown processing of the component Certificate Handler. Performing a manipulation of the argument Username results in certificate validation (Impersonation). This vulnerability was named CVE-2019-3814. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Dovecot up to 2.2.36.0/2.3.4.0 (Mail Server Software). This affects an unknown code block of the component Certificate Handler. The manipulation of the argument username with an unknown input leads to a certificate validation vulnerability (Impersonation). CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

It was discovered that Dovecot before versions 2.2.36.1 and 2.3.4.1 incorrectly handled client certificates. A remote attacker in possession of a valid certificate with an empty username field could possibly use this issue to impersonate other users.

The bug was discovered 02/05/2019. The weakness was presented 03/27/2019 by Aki Tuomi as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2019-3814 since 01/03/2019. It is possible to initiate the attack remotely. The requirement for exploitation is a authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 50 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 172203 (SUSE Enterprise Linux Security Update for dovecot22 (SUSE-SU-2019:0900-1)).

Upgrading to version 2.2.36.1 or 2.3.4.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 107672†). See VDB-132597 for similar entry. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Mail Server Software

Name

• Dovecot

Version

• 2.2.0
• 2.2.1
• 2.2.2
• 2.2.3
• 2.2.4
• 2.2.5
• 2.2.6
• 2.2.7
• 2.2.8
• 2.2.9
• 2.2.10
• 2.2.11
• 2.2.12
• 2.2.13
• 2.2.14
• 2.2.15
• 2.2.16
• 2.2.17
• 2.2.18
• 2.2.19
• 2.2.20
• 2.2.21
• 2.2.22
• 2.2.23
• 2.2.24
• 2.2.25
• 2.2.26
• 2.2.27
• 2.2.28
• 2.2.29
• 2.2.30
• 2.2.31
• 2.2.32
• 2.2.33
• 2.2.34
• 2.2.35
• 2.2.36.0
• 2.3.0
• 2.3.1
• 2.3.2
• 2.3.3
• 2.3.4.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.8

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.8
NVD Vector: 🔍

CNA Base Score: 7.7
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Name: Impersonation
Class: Certificate validation / Impersonation
CWE: CWE-295 / CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Dovecot 2.2.36.1/2.3.4.1

Timelineinfo

01/03/2019 🔍
02/05/2019 +33 days 🔍
03/27/2019 +50 days 🔍
03/28/2019 +1 days 🔍
04/02/2019 +5 days 🔍
08/17/2023 +1598 days 🔍

Sourcesinfo

Advisory: RHSA-2019:3467
Researcher: Aki Tuomi
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2019-3814 (🔍)
GCVE (CVE): GCVE-0-2019-3814
GCVE (VulDB): GCVE-100-132543
SecurityFocus: 107672 - Dovecot CVE-2019-7524 Stack Buffer Overflow Vulnerability

See also: 🔍

Entryinfo

Created: 03/28/2019 14:11
Updated: 08/17/2023 10:29
Changes: 03/28/2019 14:11 (66), 05/22/2020 12:39 (5), 08/17/2023 10:23 (4), 08/17/2023 10:29 (12)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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