Unrated severityNVD Advisory· Published Feb 23, 2021· Updated Aug 3, 2024
CVE-2021-20230
CVE-2021-20230
Description
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.
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Affected products
18- osv-coords16 versionspkg:rpm/almalinux/stunnelpkg:rpm/opensuse/stunnel&distro=openSUSE%20Leap%2015.2pkg:rpm/suse/stunnel&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP2pkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/stunnel&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/stunnel&distro=SUSE%20Manager%20Proxy%204.0pkg:rpm/suse/stunnel&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0pkg:rpm/suse/stunnel&distro=SUSE%20Manager%20Server%204.0
< 5.56-5.el8_3+ 15 more
- (no CPE)range: < 5.56-5.el8_3
- (no CPE)range: < 5.57-lp152.2.6.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.57-3.11.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
- (no CPE)range: < 5.44-3.8.1
Patches
Vulnerability mechanics
References
3- security.gentoo.org/glsa/202105-02mitrevendor-advisoryx_refsource_GENTOO
- bugzilla.redhat.com/show_bug.cgimitrex_refsource_MISC
- github.com/mtrojnar/stunnel/commit/ebad9ddc4efb2635f37174c9d800d06206f1edf9mitrex_refsource_MISC
News mentions
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