MitreCVELIST:CVE-2021-34557CVE-2021-34557
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.
References
www.openwall.com/lists/oss-security/2021/06/11/1
www.openwall.com/lists/oss-security/2021/07/06/2
github.com/QubesOS/qubes-issues/issues/6595
github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt
github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TC4QB7TRS4GS7LDXQQ4PC6J3LVFJYISV/
www.openwall.com/lists/oss-security/2021/06/05/1
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