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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...
CVE-2021-20230
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ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Debian DEBIAN-CVE-2021-20230 stunnel4 修正版: 3:5.56+dfsg-8
原文の説明 取得元が公開している説明をそのまま載せています (多くは英語)。
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. 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. The highest threat from this vulnerability is to confidentiality.
参照URL
- advisory security.gentoo.org
- patch github.com
- report bugzilla.redhat.com