Dovecot up to 2.2.33 TLS SNI resource management

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.
4.7	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Dovecot up to 2.2.33. This affects an unknown function of the component TLS SNI Handler. The manipulation results in resource management. This vulnerability is reported as CVE-2017-15130. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Dovecot up to 2.2.33 (Mail Server Software). Affected is an unknown part of the component TLS SNI Handler. The manipulation with an unknown input leads to a resource management vulnerability. CWE is classifying the issue as CWE-399. This is going to have an impact on availability. CVE summarizes:

A denial of service flaw was found in dovecot before 2.2.34. An attacker able to generate random SNI server names could exploit TLS SNI configuration lookups, leading to excessive memory usage and the process to restart.

The bug was discovered 02/28/2018. The weakness was disclosed 03/02/2018 by Aleksandar Nikolic with Cisco Talos (Website). The advisory is shared for download at dovecot.org. This vulnerability is traded as CVE-2017-15130 since 10/08/2017. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108767 (Debian DLA-1333-1 : dovecot security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197070 (Ubuntu Security Notification for Dovecot Vulnerabilities (USN-3587-1)).

Upgrading to version 2.2.34 eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (108767) and SecurityFocus (BID 103201†). The entries VDB-112447 and VDB-114009 are pretty similar. Once again VulDB remains the best 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

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.8
VulDB Meta Temp Score: 4.7

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Resource management
CWE: CWE-399 / CWE-404
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

Nessus ID: 108767
Nessus Name: Debian DLA-1333-1 : dovecot security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 831684
OpenVAS Name: Debian Security Advisory DSA 4130-1 (dovecot - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: Dovecot 2.2.34

Timelineinfo

10/08/2017 🔍
02/28/2018 +143 days 🔍
03/01/2018 +1 days 🔍
03/02/2018 +1 days 🔍
03/02/2018 +0 days 🔍
03/03/2018 +1 days 🔍
03/31/2018 +28 days 🔍
04/02/2018 +2 days 🔍
02/16/2023 +1781 days 🔍

Sourcesinfo

Advisory: USN-3587-1
Researcher: Aleksandar Nikolic
Organization: Cisco Talos
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-15130 (🔍)
GCVE (CVE): GCVE-0-2017-15130
GCVE (VulDB): GCVE-100-114012

OVAL: 🔍

SecurityFocus: 103201 - Dovecot CVE-2017-14461 Out-Of-Bounds Read Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 03/03/2018 14:26
Updated: 02/16/2023 14:28
Changes: 03/03/2018 14:26 (77), 01/10/2020 08:13 (7), 02/16/2023 14:28 (4)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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