Microsoft issued four security bulletins overnight, related to its Windows operating system and SQL Server database software.
The company said late Wednesday that a bug in a Windows help file could let a hacker seize control of a person's computer. The bug affects most currently supported versions of Windows: 98, 98 Second Edition, Millennium Edition, XP, NT 4, NT 4 Terminal Server Edition and 2000. Microsoft reported two separate problems with the help file system, which warranted issuing a "critical" alert.
Microsoft also issued two "moderate" alerts, one identifying two separate security bugs involving compressed files and the other three problems with Microsoft's Services for Unix 3. A fourth critical alert advised of a cumulative patch for protecting SQL Server 7 and 2000 from hackers.
The alerts follow a string of security warnings from Microsoft. In late September, for example, Microsoft warned of a bug affecting FrontPage. Some other flaws announced that month affected Microsoft's Java version and Word documents.
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