CVE-2019-11244: Kubernetes Unsafe Cacheing

The vulnerability stemmed from two key issues: 1) Cache directories created with 0755 permissions allowed world-write access, 2) Cache files created with 0666 permissions. The core vulnerable functions are those handling filesystem operations in the discovery/cached/disk package. Confidence is high because: 1) The GitHub commit f228ae3 explicitly shows permission changes from 0755->0750 and 0666->0660 in these functions 2) CVE description matches the patched file permissions 3) Added test cases in cached_discovery_test.go and round_tripper_test.go specifically validate permission fixes 4) Red Hat advisories reference these client-go components as vulnerable vectors.