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.
5.1	$0-$5k	0.00

A vulnerability was found in OpenBSD OpenSMTPD 5.3.1 (Operating System). It has been classified as problematic. This affects an unknown code block of the component Locking. The manipulation with an unknown input leads to a cryptographic issues vulnerability. CWE is classifying the issue as CWE-310. This is going to have an impact on availability. The summary by CVE is:

OpenSMTPD before 5.3.2 does not properly handle SSL sessions, which allows remote attackers to cause a denial of service (connection blocking) by keeping a connection open.

The weakness was disclosed 05/27/2014 by Jason A. Donenfeld as confirmed git commit (GIT Repository). The advisory is shared at git.zx2c4.com. This vulnerability is uniquely identified as CVE-2013-2125 since 02/19/2013. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1600 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 66586 (OpenSMTPD TLS Blocking Socket Remote DoS), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SMTP problems.

Upgrading to version 5.3.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.zx2c4.com. The best possible mitigation is suggested to be patching the affected component.

The vulnerability is also documented in the databases at X-Force (84388) and Tenable (66586).

Productinfo

Type

• Operating System

Vendor

• OpenBSD

Name

• OpenSMTPD

Version

• 5.3.1

License

• open-source

CPE 2.3info

• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

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

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: Cryptographic issues
CWE: CWE-310
CAPEC: 🔍
ATT&CK: 🔍

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: 66586
Nessus Name: OpenSMTPD TLS Blocking Socket Remote DoS
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSMTPD 5.3.1
Patch: git.zx2c4.com

Timelineinfo

02/19/2013 🔍
05/16/2013 +86 days 🔍
05/16/2013 +0 days 🔍
05/21/2013 +5 days 🔍
05/24/2013 +3 days 🔍
05/29/2013 +5 days 🔍
05/27/2014 +363 days 🔍
05/27/2014 +0 days 🔍
03/25/2015 +302 days 🔍
03/22/2022 +2554 days 🔍

Sourcesinfo

Vendor: openbsd.org

Advisory: git.zx2c4.com
Researcher: Jason A. Donenfeld
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2013-2125 (🔍)
X-Force: 84388
Vulnerability Center: 39756 - OpenSMTPD 5.3.1 Allows Remote DoS Vulnerability Due to an Error in SSL Handshakes, Medium
SecurityFocus: 59985 - OpenSMTPD CVE-2013-2125 Denial of Service Vulnerability
Secunia: 53353 - OpenSMTPD SSL Session Handling Denial of Service Vulnerability, Moderately Critical
OSVDB: 93495

Entryinfo

Created: 03/25/2015 16:45
Updated: 03/22/2022 08:20
Changes: 03/25/2015 16:45 (67), 05/01/2017 11:15 (7), 03/22/2022 08:20 (3)
Complete: 🔍

Discussion

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