ISS X-Force Database: stunnel-ocsp-security-bypass(42528): Stunnel OCSP security bypass

Stunnel OCSP security bypass

stunnel-ocsp-security-bypass (42528)

Medium Risk

Description:

Michael Trojnara's Stunnel could allow a local attacker to bypass security restrictions, caused by the improper validation of user-supplied certificates by the OCSP function. An attacker could exploit this vulnerability using a revoked certificate to successfully authenticate.

*CVSS:

Base Score:	4.6
Access Vector:	Local
Access Complexity:	Low
Authentication:	None
Confidentiality Impact:	Partial
Integrity Impact:	Partial
Availability Impact:	Partial

Temporal Score:	3.4
Exploitability:	Unproven
Remediation Level:	Official-Fix
Report Confidence:	Confirmed

Consequences:

Bypass Security

Remedy:

Upgrade to the latest version of Stunnel (4.24 or later), available from the Stunnel Web site. See References.

References:

Stunnel Web site: Download Stunnel.
stunnel-announce Mailing List, Mon May 19 14:36:49 CEST 2008: stunnel 4.24 released.
BID-29309: Stunnel OCSP Certificate Validation Security Bypass Vulnerability
CVE-2008-2420: 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.
GLSA-200808-08: stunnel: Security bypass
MDVSA-2008:168: stunnel
OSVDB ID: 45357: Stunnel OCSP Revocated Certificate Rejection Weakness
SA30335: Stunnel OCSP Revoked Certificate Security Issue
VUPEN/ADV-2008-1569: Stunnel OCSP Functionality Certificate Validation Bypass Vulnerability

Platforms Affected:

Gentoo Linux
MandrakeSoft Mandrake Linux 2007.1 X86_64
MandrakeSoft Mandrake Linux 2007.1
MandrakeSoft Mandrake Linux 2008.0
MandrakeSoft Mandrake Linux 2008.0 X86_64
MandrakeSoft Mandrake Linux 2008.1 X86_64
MandrakeSoft Mandrake Linux 2008.1
Stunnel Stunnel 3.10
Stunnel Stunnel 3.11
Stunnel Stunnel 3.12
Stunnel Stunnel 3.13
Stunnel Stunnel 3.14
Stunnel Stunnel 3.15
Stunnel Stunnel 3.16
Stunnel Stunnel 3.17
Stunnel Stunnel 3.18
Stunnel Stunnel 3.19
Stunnel Stunnel 3.20
Stunnel Stunnel 3.21
Stunnel Stunnel 3.21a
Stunnel Stunnel 3.21b
Stunnel Stunnel 3.21c
Stunnel Stunnel 3.22
Stunnel Stunnel 3.23
Stunnel Stunnel 3.24
Stunnel Stunnel 3.25
Stunnel Stunnel 3.26
Stunnel Stunnel 3.4a
Stunnel Stunnel 3.5
Stunnel Stunnel 3.6
Stunnel Stunnel 3.7
Stunnel Stunnel 3.8
Stunnel Stunnel 3.8 p3
Stunnel Stunnel 3.8 p4
Stunnel Stunnel 3.8 p2
Stunnel Stunnel 3.8 p1
Stunnel Stunnel 3.9
Stunnel Stunnel 4.0
Stunnel Stunnel 4.01
Stunnel Stunnel 4.02
Stunnel Stunnel 4.03
Stunnel Stunnel 4.04
Stunnel Stunnel 4.05
Stunnel Stunnel 4.06
Stunnel Stunnel 4.07
Stunnel Stunnel 4.08
Stunnel Stunnel 4.09
Stunnel Stunnel 4.10
Stunnel Stunnel 4.11
Stunnel Stunnel 4.12
Stunnel Stunnel 4.13
Stunnel Stunnel 4.14
Stunnel Stunnel 4.15
Stunnel Stunnel 4.16
Stunnel Stunnel 4.17
Stunnel Stunnel 4.18
Stunnel Stunnel 4.19
Stunnel Stunnel 4.20
Stunnel Stunnel 4.21
Stunnel Stunnel 4.22
Stunnel Stunnel 4.23

Reported:

May 19, 2008

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email ignore thisxforceignore this@ignore thisus.ignore thisibm.comignore this

Return to the main page

* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

About IBM Internet Security Systems

IBM Internet Security Systems is a trusted security advisor to thousands of the world's leading businesses and governments, helping to provide pre-emptive protection for networks, desktops and servers. The IBM Proventia? integrated security platform is designed to automatically protect against both known and unknown threats, helping to keep networks up and running and shield customers from online attacks before they impact business assets. IBM Internet Security Systems products and services are based on the proactive security intelligence of its X-Force? research and development team ? an unequivocal world authority in vulnerability and threat research. The IBM Internet Security Systems product line is also complemented by comprehensive Managed Security Services and Professional Security Services. For more information, visit the IBM Internet Security Systems Web site at www.iss.net or call 800-776-2362.