"There were easier ones to find that people did find sooner," he said.
In addition to the RPC vulnerability, Microsoft warned of two other security flaws, both rated "Important" by the company.
According to bulletin MS03-027, an unchecked buffer in a function used by the Windows XP desktop could enable an attacker to use a specially crafted configuration file to crash a Windows system and potentially execute code on the system.
Only machines running Windows XP Service Pack 1 are affected by the vulnerability, and attackers would be limited to the current Windows user's level of system access.
In MS03-028, the Redmond, Washington company warned of a vulnerability in its Internet Security and Acceleration (ISA) Server 2000 that could enable an attacker to use an ISA server to send malicious code to another user.
The flaw affects HTML error pages used by ISA Server to send customized error messages to requesting client machines.
An attacker would first have to know the address of the ISA server and its access policies and be able to trick a victim into viewing an affected HTML error page and clicking a link on that page, Microsoft said.
In addition, the ISA Server would need to be acting as a gateway device to access the Internet directly, something that Microsoft does not recommend, Jones said.
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