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About Apple security updates
For our customers' protection, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are available. Recent releases are listed on the Apple security updates page.
For more information about security, see the Apple Product Security page. You can encrypt communications with Apple using the Apple Product Security PGP Key.
Apple security documents reference vulnerabilities by CVE-ID when possible.
Xcode 9.2
Released December 4, 2017
ld64
Available for: macOS Sierra 10.12.6 or later
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Impact: Compiling with untrusted sources may lead to arbitrary code execution with user privileges
Description: A buffer overflow was addressed with improved bounds checking.
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CVE-2017-7167: sss of Qihoo 360 Nirvan Team