CVE-2021-34557

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Summary

CVECVE-2021-34557
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-06-10 16:15:00 UTC
Updated2023-11-07 03:36:00 UTC
DescriptionXScreenSaver 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.

Risk And Classification

Problem Types: CWE-120

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 33 All All All
Application Xscreensaver Project Xscreensaver 5.45 All All All

References

ReferenceSourceLinkTags
[SECURITY] Fedora 33 Update: xscreensaver-5.45-2.fc33 - package-announce - Fedora Mailing-Lists lists.fedoraproject.org
qubes-xscreensaver/0001-Fix-updating-outputs-info.patch at master · QubesOS/qubes-xscreensaver · GitHub MISC github.com
oss-security - Re: XScreenSaver 5.45: Disconnecting a video output can cause XScreenSaver to crash and unlock MLIST www.openwall.com
oss-security - XScreenSaver 5.45: Disconnecting a video output can cause XScreenSaver to crash and unlock MISC www.openwall.com
oss-security - xscreensaver 5.45 crash MLIST www.openwall.com
Xscreensaver dies unexpectedly, cannot lock screen · Issue #6595 · QubesOS/qubes-issues · GitHub MISC github.com
qubes-secpack/qsb-068-2021.txt at master · QubesOS/qubes-secpack · GitHub MISC github.com
[SECURITY] Fedora 33 Update: xscreensaver-5.45-2.fc33 - package-announce - Fedora Mailing-Lists FEDORA lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 179496 Debian Security Update for xscreensaver (CVE-2021-34557)
  • 281823 Fedora Security Update for xscreensaver (FEDORA-2021-5af4452ffd)
  • 502403 Alpine Linux Security Update for xscreensaver
  • 752425 SUSE Enterprise Linux Security Update for xscreensaver (SUSE-SU-2022:2641-1)
  • 752428 SUSE Enterprise Linux Security Update for xscreensaver (SUSE-SU-2022:2642-1)

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