Dovecot up to 2.2.16 ssl-proxy-openssl.c ssl-proxy-opensslc 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.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Dovecot up to 2.2.16 and classified as problematic. Impacted is the function ssl-proxy-opensslc of the file ssl-proxy-openssl.c. This manipulation causes certificate validation. This vulnerability is tracked as CVE-2015-3420. The attack is possible to be carried out remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Dovecot up to 2.2.16 (Mail Server Software). It has been declared as problematic. Affected by this vulnerability is the function ssl-proxy-opensslc of the file ssl-proxy-openssl.c. The manipulation with an unknown input leads to a certificate validation vulnerability. The CWE definition for the vulnerability is CWE-295. The product does not validate, or incorrectly validates, a certificate. As an impact it is known to affect availability. The summary by CVE is:

The ssl-proxy-openssl.c function in Dovecot before 2.2.17, when SSLv3 is disabled, allow remote attackers to cause a denial of service (login process crash) via vectors related to handshake failures.

The bug was discovered 04/26/2015. The weakness was disclosed 09/19/2017 by Hanno Böck (Website). The advisory is shared at dovecot.org. This vulnerability is known as CVE-2015-3420 since 04/27/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1587.003 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 83548 (Fedora 21 : dovecot-2.2.16-2.fc21 (2015-7089)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115102 (Fedora Security Update for dovecot (FEDORA-2015-7159)).

Upgrading to version 2.2.17 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (83548) and SecurityFocus (BID 74335†). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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

License

• open-source

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.9
NVD Vector: 🔍

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

Class: Certificate validation
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

Nessus ID: 83548
Nessus Name: Fedora 21 : dovecot-2.2.16-2.fc21 (2015-7089)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 867773
OpenVAS Name: Fedora Update for dovecot FEDORA-2015-7159
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Dovecot 2.2.17

Timelineinfo

04/26/2015 🔍
04/27/2015 +1 days 🔍
04/27/2015 +0 days 🔍
04/29/2015 +2 days 🔍
05/20/2015 +21 days 🔍
09/19/2017 +853 days 🔍
09/19/2017 +0 days 🔍
09/20/2017 +1 days 🔍
11/17/2019 +788 days 🔍

Sourcesinfo

Advisory: dovecot.org
Researcher: Hanno Böck
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-3420 (🔍)
GCVE (CVE): GCVE-0-2015-3420
GCVE (VulDB): GCVE-100-106837
SecurityFocus: 74335

Entryinfo

Created: 09/20/2017 08:48
Updated: 11/17/2019 17:31
Changes: 09/20/2017 08:48 (77), 11/17/2019 17:31 (2)
Complete: 🔍
Cache ID: 216::103

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Discussion

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