Vulnerability-Lookup

alsa-2021:0618

Vulnerability from osv_almalinux

Published

2021-02-22 09:54

Modified

2021-02-22 09:54

Summary

Important: stunnel security update

Details

Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over an encrypted connection (encrypted using SSL or TLS) or to provide an encrypted means of connecting to services that do not natively support encryption.

Security Fix(es):

stunnel: client certificate not correctly verified when redirect and verifyChain options are used (CVE-2021-20230)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:8",
        "name": "stunnel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.56-5.el8_3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Stunnel is a wrapper for network connections. It can be used to tunnel an unencrypted network connection over an encrypted connection (encrypted using SSL or TLS) or to provide an encrypted means of connecting to services that do not natively support encryption.\n\nSecurity Fix(es):\n\n* stunnel: client certificate not correctly verified when redirect and verifyChain options are used (CVE-2021-20230)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "id": "ALSA-2021:0618",
  "modified": "2021-02-22T09:54:57Z",
  "published": "2021-02-22T09:54:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/8/ALSA-2021-0618.html"
    },
    {
      "type": "REPORT",
      "url": "https://vulners.com/cve/CVE-2021-20230"
    }
  ],
  "related": [
    "CVE-2021-20230"
  ],
  "summary": "Important: stunnel security update"
}

CVE-2021-20230 (GCVE-0-2021-20230)

Vulnerability from cvelistv5 – Published: 2021-02-23 16:34 – Updated: 2024-08-03 17:30

Summary

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.

Severity ?

No CVSS data available.

CWE

CWE-295

Assigner

redhat

References

URL

Tags

	https://bugzilla.redhat.com/show_bug.cgi?id=1925226	x_refsource_MISC
	https://github.com/mtrojnar/stunnel/commit/ebad9d…	x_refsource_MISC
	https://security.gentoo.org/glsa/202105-02	vendor-advisoryx_refsource_GENTOO

Impacted products

	Vendor	Product	Version
	n/a	stunnel	Affected: stunnel 5.57

Show details on NVD website

JSON

To clipboard

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            "url": "https://github.com/mtrojnar/stunnel/commit/ebad9ddc4efb2635f37174c9d800d06206f1edf9"
          },
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        ],
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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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