CVE-2021-34557

Published on: 06/10/2021 12:00:00 AM UTC

Last Modified on: 06/11/2021 03:15:00 PM UTC

The following vulnerability was found:

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 References

Description Tags Link
qubes-xscreensaver/0001-Fix-updating-outputs-info.patch at master · QubesOS/qubes-xscreensaver · GitHub github.com
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URL Logo MISC github.com/QubesOS/qubes-xscreensaver/blob/master/0001-Fix-updating-outputs-info.patch
oss-security - Re: XScreenSaver 5.45: Disconnecting a video output can cause XScreenSaver to crash and unlock www.openwall.com
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URL Logo MLIST [oss-security] 20210611 Re: XScreenSaver 5.45: Disconnecting a video output can cause XScreenSaver to crash and unlock
oss-security - XScreenSaver 5.45: Disconnecting a video output can cause XScreenSaver to crash and unlock www.openwall.com
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URL Logo MISC www.openwall.com/lists/oss-security/2021/06/05/1
Xscreensaver dies unexpectedly, cannot lock screen · Issue #6595 · QubesOS/qubes-issues · GitHub github.com
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URL Logo MISC github.com/QubesOS/qubes-issues/issues/6595
qubes-secpack/qsb-068-2021.txt at master · QubesOS/qubes-secpack · GitHub github.com
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URL Logo MISC github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txt

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-34557 : XScreenSaver 5.45 can be bypassed if the machine has more than ten disconnectable video outputs. A… twitter.com/i/web/status/1… 2021-06-10 16:08:40
Reddit Logo Icon /r/netcve CVE-2021-34557 2021-06-10 16:41:52
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