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.
References
| Link | Resource |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1925226 | Issue Tracking Third Party Advisory |
| https://github.com/mtrojnar/stunnel/commit/ebad9ddc4efb2635f37174c9d800d06206f1edf9 | Patch Third Party Advisory |
| https://security.gentoo.org/glsa/202105-02 | Third Party Advisory |
Configurations
History
01 Jun 2022, 18:05
| Type | Values Removed | Values Added |
|---|---|---|
| References | (GENTOO) https://security.gentoo.org/glsa/202105-02 - Third Party Advisory |
26 May 2021, 10:15
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
27 Feb 2021, 01:12
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:stunnel:stunnel:*:*:*:*:*:*:*:* | |
| References | (MISC) https://github.com/mtrojnar/stunnel/commit/ebad9ddc4efb2635f37174c9d800d06206f1edf9 - Patch, Third Party Advisory | |
| References | (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1925226 - Issue Tracking, Third Party Advisory | |
| CVSS |
v2 : v3 : |
v2 : 5.0
v3 : 7.5 |
23 Feb 2021, 17:26
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2021-02-23 17:15
Updated : 2023-12-10 13:41
NVD link : CVE-2021-20230
Mitre link : CVE-2021-20230
CVE.ORG link : CVE-2021-20230
JSON object : View
Products Affected
stunnel
- stunnel
CWE
CWE-295
Improper Certificate Validation