GLSA 202105-02: stunnel: Improper certificate validation

http://security.gentoo.org/

Severity:	low
Title:	stunnel: Improper certificate validation
Date:	05/26/2021
Bugs:	#772146
ID:	202105-02

Synopsis

Stunnel was not properly verifying TLS certificates, possibly allowing an integrity/confidentiality compromise.

Background

The stunnel program is designed to work as an SSL/TLS encryption wrapper between a client and a local or remote server.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-misc/stunnel	< 5.58	>= 5.58	All supported architectures

Description

It was discovered that stunnel did not correctly verified the client certificate when options “redirect” and “verifyChain” are used.

Impact

A remote attacker could send a specially crafted certificate, possibly resulting in a breach of integrity or confidentiality.

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-5.58"

References

CVE-2021-20230

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202105-02.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 security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.