What is the severity of CVE-2021-34557?

CVE-2021-34557 has a medium severity due to its potential to bypass standard screen lock authentication.

How do I fix CVE-2021-34557?

To fix CVE-2021-34557, update XScreenSaver to version 5.46 or later as soon as it becomes available.

Who is affected by CVE-2021-34557?

CVE-2021-34557 affects users of XScreenSaver version 5.45 and users of Fedora 33 with this version installed.

What does CVE-2021-34557 exploit?

CVE-2021-34557 exploits a buffer overflow in the update_screen_layout() function to allow screen lock bypass.

Can CVE-2021-34557 be exploited remotely?

CVE-2021-34557 requires physical access to the machine, thus it cannot be exploited remotely.

Vulnerability/
CVE-2021-34557

medium

4.6

CWE

120 119

10/6/2021

4/8/2024

CVE-2021-34557: Buffer Overflow

First published: Thu Jun 10 2021(Updated: )

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

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
XScreenSaver	=5.45
Fedoraproject Fedora	=33

Remedy

https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch

Never miss a vulnerability like this again

Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-34557?
CVE-2021-34557 has a medium severity due to its potential to bypass standard screen lock authentication.
How do I fix CVE-2021-34557?
To fix CVE-2021-34557, update XScreenSaver to version 5.46 or later as soon as it becomes available.
Who is affected by CVE-2021-34557?
CVE-2021-34557 affects users of XScreenSaver version 5.45 and users of Fedora 33 with this version installed.
What does CVE-2021-34557 exploit?
CVE-2021-34557 exploits a buffer overflow in the update_screen_layout() function to allow screen lock bypass.
Can CVE-2021-34557 be exploited remotely?
CVE-2021-34557 requires physical access to the machine, thus it cannot be exploited remotely.

agent/type
collector/mitre-cve
source/MITRE
agent/references
agent/severity
agent/author
agent/weakness
agent/remedy
agent/last-modified-date
agent/event
agent/description
agent/softwarecombine
agent/first-publish-date
agent/source
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/xscreensaver project
canonical/xscreensaver
version/xscreensaver/5.45
vendor/fedoraproject
canonical/fedoraproject fedora
version/fedoraproject fedora/33

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Frequently Asked Questions

What is the severity of CVE-2021-34557?
CVE-2021-34557 has a medium severity due to its potential to bypass standard screen lock authentication.
How do I fix CVE-2021-34557?
To fix CVE-2021-34557, update XScreenSaver to version 5.46 or later as soon as it becomes available.
Who is affected by CVE-2021-34557?
CVE-2021-34557 affects users of XScreenSaver version 5.45 and users of Fedora 33 with this version installed.
What does CVE-2021-34557 exploit?
CVE-2021-34557 exploits a buffer overflow in the update_screen_layout() function to allow screen lock bypass.
Can CVE-2021-34557 be exploited remotely?
CVE-2021-34557 requires physical access to the machine, thus it cannot be exploited remotely.