Stunnel up to 5.13 Redirect Option access control

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Stunnel up to 5.13. This impacts an unknown function of the component Redirect Option Handler. This manipulation causes access control. This vulnerability appears as CVE-2015-3644. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in Stunnel up to 5.13. Affected by this vulnerability is some unknown processing of the component Redirect Option Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Stunnel 5.00 through 5.13, when using the redirect option, does not redirect client connections to the expected server after the initial connection, which allows remote attackers to bypass authentication.

The weakness was presented 05/14/2015 (Website). It is possible to read the advisory at stunnel.org. This vulnerability is known as CVE-2015-3644 since 05/04/2015. 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 attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 83730 (stunnel < 5.14 Authentication Bypass Vulnerability), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows. The commercial vulnerability scanner Qualys is able to test this issue with plugin 115165 (Stunnel Authentication Bypass Vulnerability).

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 Tenable (83730), SecurityFocus (BID 74659†) and Vulnerability Center (SBV-50332†). Statistical analysis made it clear that VulDB provides the best quality 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: 7.3

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

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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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-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 83730
Nessus Name: stunnel < 5.14 Authentication Bypass Vulnerability
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

OpenVAS ID: 703299
OpenVAS Name: Debian Security Advisory DSA 3299-1 (stunnel4 - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

Timelineinfo

05/04/2015 🔍
05/13/2015 +9 days 🔍
05/13/2015 +0 days 🔍
05/13/2015 +0 days 🔍
05/14/2015 +1 days 🔍
05/15/2015 +1 days 🔍
05/20/2015 +5 days 🔍
05/28/2015 +8 days 🔍
11/25/2024 +3469 days 🔍

Sourcesinfo

Advisory: stunnel.org
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-3644 (🔍)
GCVE (CVE): GCVE-0-2015-3644
GCVE (VulDB): GCVE-100-75403

OVAL: 🔍

SecurityFocus: 74659 - Stunnel CVE-2015-3644 Authentication Bypass Vulnerability
SecurityTracker: 1032324
Vulnerability Center: 50332 - Stunnel 5.00 through 5.13 Remote Bypass Restrictions due to Improper Redirection of Client\x27s Connections, Medium

Entryinfo

Created: 05/15/2015 11:11
Updated: 11/25/2024 17:27
Changes: 05/15/2015 11:11 (63), 06/29/2017 07:36 (4), 05/17/2022 16:14 (3), 05/17/2022 16:22 (1), 11/25/2024 17:27 (20)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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