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    CVE-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.

    Published:Jun 10, 2021
    Last Modified:Nov 21, 2024
    EPS:Jun 10, 2021
    EPSS Score:0.00051
    CVSS Score:4.6

    Affected Products

    Vendor
    Fedoraproject
    Product
    Fedora
    Vendor
    Xscreensaver Project
    Product
    Xscreensaver

    Exploits

    http://www.openwall.com/lists/oss-security/2021/07/06/2https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txthttps://www.openwall.com/lists/oss-security/2021/06/05/1http://www.openwall.com/lists/oss-security/2021/07/06/2https://github.com/QubesOS/qubes-secpack/blob/master/QSBs/qsb-068-2021.txthttps://www.openwall.com/lists/oss-security/2021/06/05/1

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    References

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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High