UBUNTU-CVE-2021-31523

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Source
https://ubuntu.com/security/CVE-2021-31523
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-31523.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2021-31523
Upstream
Published
2021-04-21T19:15:00Z
Modified
2025-09-08T16:47:08Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

The Debian xscreensaver 5.42+dfsg1-1 package for XScreenSaver has capnetraw enabled for the /usr/libexec/xscreensaver/sonar file, which allows local users to gain privileges because this is arguably incompatible with the design of the Mesa 3D Graphics library dependency.

References

Affected packages

Ubuntu:22.04:LTS

xscreensaver

Package

Name
xscreensaver
Purl
pkg:deb/ubuntu/xscreensaver@5.45+dfsg1-2ubuntu1?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.45+dfsg1-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.45+dfsg1-2ubuntu1",
            "binary_name": "xscreensaver"
        },
        {
            "binary_version": "5.45+dfsg1-2ubuntu1",
            "binary_name": "xscreensaver-data"
        },
        {
            "binary_version": "5.45+dfsg1-2ubuntu1",
            "binary_name": "xscreensaver-data-extra"
        },
        {
            "binary_version": "5.45+dfsg1-2ubuntu1",
            "binary_name": "xscreensaver-gl"
        },
        {
            "binary_version": "5.45+dfsg1-2ubuntu1",
            "binary_name": "xscreensaver-gl-extra"
        },
        {
            "binary_version": "5.45+dfsg1-2ubuntu1",
            "binary_name": "xscreensaver-screensaver-bsod"
        },
        {
            "binary_version": "5.45+dfsg1-2ubuntu1",
            "binary_name": "xscreensaver-screensaver-webcollage"
        }
    ]
}

Ubuntu:24.04:LTS

xscreensaver

Package

Name
xscreensaver
Purl
pkg:deb/ubuntu/xscreensaver@6.08+dfsg1-1ubuntu3?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

6.*

6.02+dfsg1-2ubuntu2
6.06+dfsg1-3ubuntu1
6.08+dfsg1-1ubuntu1
6.08+dfsg1-1ubuntu2
6.08+dfsg1-1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-data"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-data-extra"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-gl"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-gl-extra"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-screensaver-bsod"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-screensaver-webcollage"
        }
    ]
}

Ubuntu:25.04

xscreensaver

Package

Name
xscreensaver
Purl
pkg:deb/ubuntu/xscreensaver@6.08+dfsg1-1ubuntu3?arch=source&distro=plucky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

6.*

6.08+dfsg1-1ubuntu3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-data"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-data-extra"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-gl"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-gl-extra"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-screensaver-bsod"
        },
        {
            "binary_version": "6.08+dfsg1-1ubuntu3",
            "binary_name": "xscreensaver-screensaver-webcollage"
        }
    ]
}

Ubuntu:Pro:16.04:LTS

xscreensaver

Package

Name
xscreensaver
Purl
pkg:deb/ubuntu/xscreensaver@5.34-2ubuntu1?arch=source&distro=esm-apps/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.30-1ubuntu1
5.34-1ubuntu1
5.34-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.34-2ubuntu1",
            "binary_name": "xscreensaver"
        },
        {
            "binary_version": "5.34-2ubuntu1",
            "binary_name": "xscreensaver-data"
        },
        {
            "binary_version": "5.34-2ubuntu1",
            "binary_name": "xscreensaver-data-extra"
        },
        {
            "binary_version": "5.34-2ubuntu1",
            "binary_name": "xscreensaver-gl"
        },
        {
            "binary_version": "5.34-2ubuntu1",
            "binary_name": "xscreensaver-gl-extra"
        },
        {
            "binary_version": "5.34-2ubuntu1",
            "binary_name": "xscreensaver-screensaver-bsod"
        },
        {
            "binary_version": "5.34-2ubuntu1",
            "binary_name": "xscreensaver-screensaver-webcollage"
        }
    ]
}

Ubuntu:Pro:18.04:LTS

xscreensaver

Package

Name
xscreensaver
Purl
pkg:deb/ubuntu/xscreensaver@5.36-1ubuntu1?arch=source&distro=esm-apps/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.36-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.36-1ubuntu1",
            "binary_name": "xscreensaver"
        },
        {
            "binary_version": "5.36-1ubuntu1",
            "binary_name": "xscreensaver-data"
        },
        {
            "binary_version": "5.36-1ubuntu1",
            "binary_name": "xscreensaver-data-extra"
        },
        {
            "binary_version": "5.36-1ubuntu1",
            "binary_name": "xscreensaver-gl"
        },
        {
            "binary_version": "5.36-1ubuntu1",
            "binary_name": "xscreensaver-gl-extra"
        },
        {
            "binary_version": "5.36-1ubuntu1",
            "binary_name": "xscreensaver-screensaver-bsod"
        },
        {
            "binary_version": "5.36-1ubuntu1",
            "binary_name": "xscreensaver-screensaver-webcollage"
        }
    ]
}

Ubuntu:Pro:20.04:LTS

xscreensaver

Package

Name
xscreensaver
Purl
pkg:deb/ubuntu/xscreensaver@5.42+dfsg1-1ubuntu1?arch=source&distro=esm-apps/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

5.*

5.42+dfsg1-1ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "5.42+dfsg1-1ubuntu1",
            "binary_name": "xscreensaver"
        },
        {
            "binary_version": "5.42+dfsg1-1ubuntu1",
            "binary_name": "xscreensaver-data"
        },
        {
            "binary_version": "5.42+dfsg1-1ubuntu1",
            "binary_name": "xscreensaver-data-extra"
        },
        {
            "binary_version": "5.42+dfsg1-1ubuntu1",
            "binary_name": "xscreensaver-gl"
        },
        {
            "binary_version": "5.42+dfsg1-1ubuntu1",
            "binary_name": "xscreensaver-gl-extra"
        },
        {
            "binary_version": "5.42+dfsg1-1ubuntu1",
            "binary_name": "xscreensaver-screensaver-bsod"
        },
        {
            "binary_version": "5.42+dfsg1-1ubuntu1",
            "binary_name": "xscreensaver-screensaver-webcollage"
        }
    ]
}