UBUNTU-CVE-2021-34557

Source
https://ubuntu.com/security/CVE-2021-34557
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-34557.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-34557
Related
Published
2021-06-10T16:15:00Z
Modified
2025-01-13T10:22:34Z
Severity
  • 4.6 (Medium) CVSS_V3 - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A buffer overflow in updatescreenlayout() allows an attacker to bypass the standard screen lock authentication mechanism by crashing XScreenSaver. The attacker must physically disconnect many video outputs.

References

Affected packages

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

{
    "ubuntu_priority": "medium"
}

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

{
    "ubuntu_priority": "medium"
}

Ubuntu:20.04:LTS / xscreensaver

Package

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

Affected ranges

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

Affected versions

5.*

5.42+dfsg1-1ubuntu1

Ecosystem specific

{
    "ubuntu_priority": "medium"
}

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

{
    "ubuntu_priority": "medium"
}