2009-0653 | OpenSSL Certificates improper authentication (17751 / SBV-34773)

By Max On Aug 4, 2021

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.
7.3	$5k-$25k	0.10

A vulnerability classified as critical was found in OpenSSL 0.9.6 (Network Encryption Software). Affected by this vulnerability is some unknown processing of the component Certificates. The manipulation with an unknown input leads to a weak authentication vulnerability. The CWE definition for the vulnerability is CWE-287. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

OpenSSL, probably 0.9.6, does not verify the Basic Constraints for an intermediate CA-signed certificate, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack, a related issue to CVE-2002-0970.

The issue has been introduced in 09/24/2000. The weakness was published 02/20/2009 (Website). It is possible to read the advisory at blackhat.com. This vulnerability is known as CVE-2009-0653 since 02/20/2009. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn’t need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 08/04/2021).

The vulnerability was handled as a non-public zero-day exploit for at least 3071 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 17751 (OpenSSL 0.9.6 CA Basic Constraints Validation Vulnerability), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Web Servers.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Vulnerability Center (SBV-34773) and Tenable (17751).

Type

Name

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

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: 🔍

Class: Weak authentication
CWE: CWE-287
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 17751
Nessus Name: OpenSSL 0.9.6 CA Basic Constraints Validation Vulnerability
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

Threat Intelligenceinfoedit

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

09/24/2000 🔍
02/20/2009 +3071 days 🔍
02/20/2009 +0 days 🔍
02/20/2009 +0 days 🔍
02/20/2009 +0 days 🔍
01/04/2012 +1048 days 🔍
04/02/2012 +89 days 🔍
03/17/2015 +1079 days 🔍
08/03/2016 +505 days 🔍
08/04/2021 +1827 days 🔍Product: https://www.openssl.org/