QID 376189

Date Published: 2021-12-21

QID 376189: Stunnel Improper Certificate Validation Vulnerability

Stunnel is an open-source multi-platform application used to provide a universal TLS/SSL tunneling service.

A flaw was found in stunnel before 5.57, where it improperly validates client certificates when it is configured to use both redirect and verifyChain options.

Affected Version:
Version less than 5.57

This flaw allows an attacker with a certificate signed by a Certificate Authority, which is not the one accepted by the stunnel server, to access the tunneled service instead of being redirected to the address specified in the redirect option.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

For more information please visit Stunnel for updates and patch information.

Vendor References

Stunnel - github.com/mtrojnar/stunnel/blob/stunnel-5.58/NEWS.md

CVEs related to QID 376189

CVE-2021-20230 |

Software Advisories

Advisory ID	Software	Component	Link
stunnel			www.stunnel.org/downloads.html

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