Help Viewer in Apple Mac OS X before 10.6.2 does not use an HTTPS connection to retrieve Apple Help content from a web site, which allows man-in-the-middle attackers to send a crafted help:runscript link, and thereby execute arbitrary code, via a spoofed response. Per: http://support.apple.com/kb/HT3937
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Help Viewer
CVE-ID: CVE-2009-2808
Available for: Mac OS X v10.5.8, Mac OS X Server v10.5.8, Mac OS X v10.6 and v10.6.1, Mac OS X Server v10.6 and v10.6.1
Impact: Using Help Viewer on an untrusted network may result in arbitrary code execution
Description: Help Viewer does not use HTTPS for viewing remote Apple Help content. A user on the local network may send spoofed HTTP responses containing malicious help:runscript links. This update addresses the issue by using HTTPS when requesting remote Apple Help content. Credit to Brian Mastenbrook for reporting this issue.
Publication date: Wed, 11 Nov 2009 01:30:00 +0000