USN-4636-1

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Source
https://ubuntu.com/security/notices/USN-4636-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4636-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-4636-1
Upstream
Related
Published
2020-11-17T17:31:54.297082Z
Modified
2025-10-13T04:35:17Z
Summary
libvncserver, vino vulnerability
Details

It was discovered that LibVNCServer incorrectly handled certain internals. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Vino package ships with a LibVNCServer source and all listed releases were affected for this package.

References

Affected packages

Ubuntu:16.04:LTS

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.10+dfsg-3ubuntu0.16.04.6?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.10+dfsg-3ubuntu0.16.04.6

Affected versions

0.*

0.9.10+dfsg-3
0.9.10+dfsg-3build1
0.9.10+dfsg-3ubuntu0.16.04.1
0.9.10+dfsg-3ubuntu0.16.04.2
0.9.10+dfsg-3ubuntu0.16.04.3
0.9.10+dfsg-3ubuntu0.16.04.4
0.9.10+dfsg-3ubuntu0.16.04.5

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libvncclient1",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.6"
        },
        {
            "binary_name": "libvncserver-config",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.6"
        },
        {
            "binary_name": "libvncserver-dev",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.6"
        },
        {
            "binary_name": "libvncserver1",
            "binary_version": "0.9.10+dfsg-3ubuntu0.16.04.6"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-25708",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

vino

Package

Name
vino
Purl
pkg:deb/ubuntu/vino@3.8.1-0ubuntu9.4?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.8.1-0ubuntu9.4

Affected versions

3.*

3.8.1-0ubuntu6
3.8.1-0ubuntu7
3.8.1-0ubuntu8
3.8.1-0ubuntu9
3.8.1-0ubuntu9.1
3.8.1-0ubuntu9.2
3.8.1-0ubuntu9.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "vino",
            "binary_version": "3.8.1-0ubuntu9.4"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:16.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-25708",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

Ubuntu:18.04:LTS

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.11+dfsg-1ubuntu1.4?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.11+dfsg-1ubuntu1.4

Affected versions

0.*

0.9.11+dfsg-1
0.9.11+dfsg-1ubuntu1
0.9.11+dfsg-1ubuntu1.1
0.9.11+dfsg-1ubuntu1.2
0.9.11+dfsg-1ubuntu1.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libvncclient1",
            "binary_version": "0.9.11+dfsg-1ubuntu1.4"
        },
        {
            "binary_name": "libvncserver-config",
            "binary_version": "0.9.11+dfsg-1ubuntu1.4"
        },
        {
            "binary_name": "libvncserver-dev",
            "binary_version": "0.9.11+dfsg-1ubuntu1.4"
        },
        {
            "binary_name": "libvncserver1",
            "binary_version": "0.9.11+dfsg-1ubuntu1.4"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-25708",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

vino

Package

Name
vino
Purl
pkg:deb/ubuntu/vino@3.22.0-3ubuntu1.2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.22.0-3ubuntu1.2

Affected versions

3.*

3.8.1-0ubuntu12
3.22.0-2ubuntu1
3.22.0-3ubuntu1
3.22.0-3ubuntu1.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "vino",
            "binary_version": "3.22.0-3ubuntu1.2"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-25708",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

Ubuntu:20.04:LTS

libvncserver

Package

Name
libvncserver
Purl
pkg:deb/ubuntu/libvncserver@0.9.12+dfsg-9ubuntu0.3?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
0.9.12+dfsg-9ubuntu0.3

Affected versions

0.*

0.9.11+dfsg-1.3
0.9.12+dfsg-3ubuntu3
0.9.12+dfsg-6
0.9.12+dfsg-7
0.9.12+dfsg-8
0.9.12+dfsg-9
0.9.12+dfsg-9ubuntu0.1
0.9.12+dfsg-9ubuntu0.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libvncclient1",
            "binary_version": "0.9.12+dfsg-9ubuntu0.3"
        },
        {
            "binary_name": "libvncserver-dev",
            "binary_version": "0.9.12+dfsg-9ubuntu0.3"
        },
        {
            "binary_name": "libvncserver1",
            "binary_version": "0.9.12+dfsg-9ubuntu0.3"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-25708",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}

vino

Package

Name
vino
Purl
pkg:deb/ubuntu/vino@3.22.0-5ubuntu2.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.22.0-5ubuntu2.2

Affected versions

3.*

3.22.0-5ubuntu2
3.22.0-5ubuntu2.1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "vino",
            "binary_version": "3.22.0-5ubuntu2.2"
        }
    ]
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2020-25708",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ]
}