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CVE-2021-34557

CVE-2021-34557

EPSS 0.5%
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.
Affected products
n/a · n/a

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References
https://github.com/QubesOS/qubes-issues/issues/6595https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txthttps://github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patchhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/https://www.openwall.com/lists/oss-security/2021/06/05/1http://www.openwall.com/lists/oss-security/2021/06/11/1http://www.openwall.com/lists/oss-security/2021/07/06/2