USN-6901-1

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Source
https://ubuntu.com/security/notices/USN-6901-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6901-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-6901-1
Upstream
Related
Published
2024-07-18T05:18:18Z
Modified
2026-02-10T04:44:41Z
Summary
stunnel4 vulnerability
Details

It was discovered that stunnel did not properly validate client certificates when configured to use both the redirect and verifyChain options. A remote attacker could potentially use this issue to obtain sensitive information by accessing the tunneled service.

References

Affected packages

Ubuntu:Pro:18.04:LTS / stunnel4

Package

Name
stunnel4
Purl
pkg:deb/ubuntu/stunnel4@3:5.44-1ubuntu3+esm1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3:5.44-1ubuntu3+esm1

Affected versions

3:5.*
3:5.39-2
3:5.42-1
3:5.44-1ubuntu1
3:5.44-1ubuntu2
3:5.44-1ubuntu3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "stunnel4",
            "binary_version": "3:5.44-1ubuntu3+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6901-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:Pro:18.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2021-20230"
        }
    ]
}

Ubuntu:20.04:LTS / stunnel4

Package

Name
stunnel4
Purl
pkg:deb/ubuntu/stunnel4@3:5.56-1ubuntu0.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3:5.56-1ubuntu0.2

Affected versions

3:5.*
3:5.55-2build1
3:5.56-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "stunnel4",
            "binary_version": "3:5.56-1ubuntu0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6901-1.json"
cves_map 
{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ],
            "id": "CVE-2021-20230"
        }
    ]
}