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Gentoo: GLSA-202105-02 Low: Stunnel Certificate Integrity Issue

gentoo
Calendar Grey May 26, 2021
Dist Gentoo Esm H88
Gentoo GLSA 202109-01 addresses vulnerabilities in OpenSSL that compromise security and functionality.
Stunnel was not properly verifying TLS certificates, possibly allowing an integrity/confidentiality compromise.

Summary

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

Topics%20covered

Topics Covered

security advisory low severity stunnel Gentoo Linux certificate validation integrity compromise confidentiality breach

Resolution

All stunnel users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/stunnel-5.58"

References

[ 1 ] CVE-2021-20230 https://nvd.nist.gov/vuln/detail/CVE-2021-20230

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202105-02
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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.

Severity
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Severity: Low
Title: stunnel: Improper certificate validation
Date: May 26, 2021
Bugs: #772146
ID: 202105-02

Topics%20covered

Topics Covered

security advisory low severity stunnel Gentoo Linux certificate validation integrity compromise confidentiality breach

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.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-misc/stunnel < 5.58 >= 5.58

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.

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