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CVE-2021-34557

Good to know:

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Date: June 10, 2021

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.

Language: C

Severity Score

Related Resources (5)

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://nvd.nist.gov/vuln/detail/CVE-2021-34557
https://www.mend.io/vulnerability-database/CVE-2021-34557

Severity Score

Weakness Type (CWE)

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-120

Top Fix

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Upgrade Version

No fix version available

CVSS v3.1

Base Score:
Attack Vector (AV): PHYSICAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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