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CVE-2021-34557

MEDIUM

4.6

Description

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.

CVE Details

CVSS v3.1 Score4.6

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorPHYSICAL

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published6/10/2021

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

fedoraproject:fedoraxscreensaver_project:xscreensaver

Weaknesses (CWE)

CWE-120

References

http://www.openwall.com/lists/oss-security/2021/06/11/1(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2021/07/06/2(cve@mitre.org)

https://github.com/QubesOS/qubes-issues/issues/6595(cve@mitre.org)

https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt(cve@mitre.org)

https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch(cve@mitre.org)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/(cve@mitre.org)

https://www.openwall.com/lists/oss-security/2021/06/05/1(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2021/06/11/1(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2021/07/06/2(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/QubesOS/qubes-issues/issues/6595(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt(af854a3a-2127-422b-91ae-364da2661108)

https://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch(af854a3a-2127-422b-91ae-364da2661108)

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/(af854a3a-2127-422b-91ae-364da2661108)

https://www.openwall.com/lists/oss-security/2021/06/05/1(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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