The QSharedMemory class in Qt 5.0.0, 4.8.x before 4.8.5, 4.7.x before 4.7.6, and other versions including 4.4.0 uses weak permissions (world-readable and world-writable) for shared memory segments, which allows local users to read sensitive information or modify critical program data, as demonstrated by reading a pixmap being sent to an X server.
CVSS Severity (version 2.0):
Impact Subscore: 4.9
Exploitability Subscore: 3.9
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification
References to Advisories, Solutions, and Tools
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[qt-announce] 20130205 [Announce] [CVE-2013-0254] Qt Project Security Advisory: System V shared memory segments created world-writeable
Advisory; Patch Information