[ GLSA 200808-08 ] stunnel: Security bypass

2008-08-0800:00:00

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Gentoo Linux Security Advisory GLSA 200808-08

                                        http://security.gentoo.org/

Severity: Low
Title: stunnel: Security bypass
Date: August 08, 2008
Bugs: #222805
ID: 200808-08

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.

Affected packages

-------------------------------------------------------------------
 Package           /  Vulnerable  /                     Unaffected
-------------------------------------------------------------------

1 net-misc/stunnel < 4.24 >= 4.24

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 &quot;&gt;=net-misc/stunnel-1.2.3&quot;

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

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
http://bugs.gentoo.org.