stunnel up to 4.23 Access Restriction access control

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 (≈)
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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.
6.6$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in stunnel up to 4.23. Affected by this issue is some unknown functionality of the component Access Restriction. The manipulation results in access control. This vulnerability is identified as CVE-2008-2420. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in stunnel up to 4.23. Affected is an unknown code block of the component Access Restriction. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The OCSP functionality in stunnel before 4.24 does not properly search certificate revocation lists (CRL), which allows remote attackers to bypass intended access restrictions by using revoked certificates.

The bug was discovered 05/19/2008. The weakness was released 05/23/2008 (Website). The advisory is shared for download at securityfocus.com. This vulnerability is traded as CVE-2008-2420 since 05/23/2008. 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 MITRE ATT&CK project declares the attack technique as T1068.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 4 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 32465 (Fedora 9 : stunnel-4.24-1.fc9 (2008-4531)), 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 43582 (Juniper JUNOS Stunnel Multiple Vulnerabilities (JSA10852)).

Upgrading to version 3.8p3 eliminates this vulnerability. A possible mitigation has been published 5 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (42528), Tenable (32465), SecurityFocus (BID 29309†), OSVDB (45357†) and Secunia (SA30335†). Entry connected to this vulnerability is available at VDB-66766. Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 32465
Nessus Name: Fedora 9 : stunnel-4.24-1.fc9 (2008-4531)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 860791
OpenVAS Name: Family Connections argv[1] Parameter Remote Arbitrary Command Execution Vulnerability
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: stunnel 3.8p3

Timelineinfo

05/19/2008 🔍
05/19/2008 +0 days 🔍
05/23/2008 +4 days 🔍
05/23/2008 +0 days 🔍
05/23/2008 +0 days 🔍
05/23/2008 +0 days 🔍
05/28/2008 +5 days 🔍
05/29/2008 +1 days 🔍
06/02/2008 +4 days 🔍
03/16/2015 +2478 days 🔍
08/10/2019 +1608 days 🔍

Sourcesinfo

Advisory: securityfocus.com⛔
Status: Not defined

CVE: CVE-2008-2420 (🔍)
GCVE (CVE): GCVE-0-2008-2420
GCVE (VulDB): GCVE-100-42516
X-Force: 42528
SecurityFocus: 29309 - Stunnel OCSP Certificate Validation Security Bypass Vulnerability
Secunia: 30335
OSVDB: 45357 - Stunnel - OCSP Certificate Validation Security Bypass Issue
Vulnerability Center: 18489 - Michal Trojnara Stunnel OCSP Vulnerability Allows Remote Attackers Bypass Security Restrictions, Medium
Vupen: ADV-2008-1569

See also: 🔍

Entryinfo

Created: 03/16/2015 17:00
Updated: 08/10/2019 18:22
Changes: 03/16/2015 17:00 (75), 08/10/2019 18:22 (7)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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