Executive Summary

Summary
Title stunnel: Security bypass
Informations
Name GLSA-200808-08 First vendor Publication 2008-08-08
Vendor Gentoo Last vendor Modification 2008-08-08
Severity (Vendor) Low Revision N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:N/C:P/I:P/A:P)
Cvss Base Score 6.8 Attack Range Network
Cvss Impact Score 6.4 Attack Complexity Medium
Cvss Expoit Score 8.6 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Synopsis

stunnel does not properly prevent the authentication of a revoked certificate which would be published by OCSP.

Background

The stunnel program is designed to work as an SSL encryption wrapper between a remote client and a local or remote server. OCSP (Online Certificate Status Protocol), as described in RFC 2560, is an internet protocol used for obtaining the revocation status of an X.509 digital certificate.

Description

An unspecified bug in the OCSP search functionality of stunnel has been discovered.

Impact

A remote attacker can use a revoked certificate that would be successfully authenticated by stunnel. This issue only concerns the users who have enabled the OCSP validation in stunnel.

Workaround

There is no known workaround at this time.

Resolution

All stunnel users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/stunnel-1.2.3"

References

[ 1 ] CVE-2008-2420 : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2420

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200808-08.xml

Original Source

Url : http://security.gentoo.org/glsa/glsa-200808-08.xml

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-264 Permissions, Privileges, and Access Controls

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 54

OpenVAS Exploits

Date Description
2009-04-09 Name : Mandriva Update for stunnel MDVSA-2008:168 (stunnel)
File : nvt/gb_mandriva_MDVSA_2008_168.nasl
2009-02-17 Name : Fedora Update for stunnel FEDORA-2008-4531
File : nvt/gb_fedora_2008_4531_stunnel_fc9.nasl
2009-02-17 Name : Fedora Update for stunnel FEDORA-2008-4579
File : nvt/gb_fedora_2008_4579_stunnel_fc8.nasl
2009-02-17 Name : Fedora Update for stunnel FEDORA-2008-4606
File : nvt/gb_fedora_2008_4606_stunnel_fc7.nasl
2008-09-24 Name : Gentoo Security Advisory GLSA 200808-08 (stunnel)
File : nvt/glsa_200808_08.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
45357 Stunnel OCSP Revocated Certificate Rejection Weakness

Nessus® Vulnerability Scanner

Date Description
2009-04-23 Name : The remote Mandriva Linux host is missing one or more security updates.
File : mandriva_MDVSA-2008-168.nasl - Type : ACT_GATHER_INFO
2008-08-10 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-200808-08.nasl - Type : ACT_GATHER_INFO
2008-05-29 Name : The remote Fedora host is missing a security update.
File : fedora_2008-4531.nasl - Type : ACT_GATHER_INFO
2008-05-29 Name : The remote Fedora host is missing a security update.
File : fedora_2008-4579.nasl - Type : ACT_GATHER_INFO
2008-05-29 Name : The remote Fedora host is missing a security update.
File : fedora_2008-4606.nasl - Type : ACT_GATHER_INFO

Alert History

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0
Date Informations
2014-02-17 11:36:01
  • Multiple Updates