Apple iOS Kernel Memory Corruption (CVE‑2016‑4656) Enables Privileged Code Execution
What It Is – CVE‑2016‑4656 is a memory‑corruption flaw in the iOS kernel that can be triggered by a crafted application. Successful exploitation allows an attacker to execute arbitrary code with kernel privileges or to cause a denial‑of‑service.
Exploitability – Public proof‑of‑concept code exists; the vulnerability is rated High (CVSS ≈ 7.5). Apple released a patch in iOS 10.2.
Affected Products – Apple iOS devices running versions prior to the 10.2 security update (iPhone, iPad, iPod Touch).
Why It Matters for Trust & Control Assurance
- Continuous patch‑management evidence is a core control; unpatched iOS devices break the “maintain up‑to‑date software” objective across SOC 2, ISO 27001, NIST CSF, etc.
- Demonstrable remediation (MDM logs, patch‑status reports) provides audit‑ready proof that the organization mitigates privileged‑code‑execution risk.
- A defensible incident‑response trail requires that any exploited device be identified, isolated, and its remediation documented promptly.
Recommended Actions
- Verify that all iOS endpoints have installed the iOS 10.2 (or later) security update.
- Use Mobile Device Management (MDM) to enforce automatic patch deployment and retain compliance logs as evidence.
- Conduct a rapid inventory scan to detect any devices still vulnerable and remediate or quarantine them.
- Update your control‑mapping repository to reflect the patched state and capture the evidence for audit purposes.
Source: CISA KEV – CVE‑2016‑4656