Archived - About the security content of the Mac OS X 10.4.5 update
Mac OS X 10.4
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Mac OS X 10.4.5 Update
Available for: Mac OS X 10.4 through 10.4.4, Mac OS X Server 10.4 through 10.4.4
Impact: A malicious local user can cause a system crash
Description: A malicious local user may trigger a system crash by invoking an undocumented system call. This update addresses the issue by removing the system call from the kernel. Credit to David Goldsmith of Matasano for reporting this issue.