Description: This security update resolves two privately reported vulnerabilities in the Pragmatic General Multicast (PGM) protocol that could allow a denial of service if malformed PGM packets are received by an affected system. An attacker who successfully exploited this vulnerability could cause a user’s system to become non-responsive and to require a restart to restore functionality. Note that the denial of service vulnerability would not allow an attacker to execute code or to elevate their user rights, but it could cause the affected system to stop accepting requests. The security update addresses these vulnerabilities by modifying the way PGM parses malformed packets. Keep reading →

Pragmatic General Multicast: A reliable multicast transport protocol. PGM provides a reliable sequence of packets to multiple recipients simultaneously, making it suitable for applications like file-transfer, streaming media and Internet television.

Vista hasn’t escaped the need for security updates in the month of June. All together, five updates affect Windows Vista; three critical, and two moderate. All updates affect both 32 and 64-bit systems, and it doesn’t matter if you have SP1 installed or not. Keep reading →