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Microsoft security update fails to patch the vulnerability it was meant to fix

Panda Security, the global IT security vendor, has warned users that one of Microsoft’s latest security updates does not fix the vulnerability it was meant to patch. Update MS09-008, released yesterday by Microsoft, was designed to fix four vulnerabilities in Windows DNS server and WINS server. However, an unpatched flaw has been detected in the DNS server, more specifically in WPAD (Web Proxy Autodiscovery Protocol ) registration.

WPAD is a service that allows automatic detection of proxy settings without user intervention.
Clients have to download WPAD entries from the DNS server, and those entries that could be affected by the “man-in-the-middle” attack. An attacker that exploited this vulnerability successfully could redirect users’ traffic through a malicious proxy.

A proxy is a programme or device widely used in companies to connect all computers in a network to the Internet through a single computer.

“If an attacker manages to redirect targeted users to a malicious proxy they could obtain private information and redirect them to malicious pages in order to infect them with malware or monitor their Internet movements,” explains Jeremy Matthews, head of Panda’s sub-Saharan operations.

Panda Security advises users who use these systems to be extra cautious and keep an eye on new Microsoft updates to patch this vulnerability as soon as possible.