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Apple security documents reference vulnerabilities by CVE-ID when possible.
Security Update 2018-001 Swift 4.1.1 for Ubuntu 14.04
Released May 4, 2018
Swift for Ubuntu
Available for: Ubuntu 14.04
Not impacted: Ubuntu 16.04 and 16.10
Impact: A process may gain admin privileges and execute arbitrary code
Description: An issue existed in specific versions of Swift on Ubuntu 14.04 where libraries are loaded with write and execute permissions. This issue was addressed with improved permissions.