CVE-2017-13861 in watchOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 11.2 is affected. tvOS before 11.2 is affected. watchOS before 4.2 is affected. The issue involves the "IOSurface" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 02/03/2025
The vulnerability identified as CVE-2017-13861 resides within Apple's IOSurface component, a critical system framework responsible for managing graphics memory and surface operations across iOS, tvOS, and watchOS platforms. This memory management system serves as a foundational element for graphics processing and rendering operations throughout the Apple ecosystem, making it a prime target for attackers seeking to escalate privileges or disrupt system functionality. The flaw affects iOS versions prior to 11.2, tvOS versions prior to 11.2, and watchOS versions prior to 4.2, indicating a widespread impact across Apple's mobile and wearable platforms.
The technical nature of this vulnerability stems from improper memory handling within the IOSurface framework, specifically manifesting as a memory corruption issue that can be exploited to execute arbitrary code with elevated privileges. Attackers can craft malicious applications that leverage this flaw to gain access to privileged execution contexts where they would normally be restricted. The vulnerability operates at the kernel level or deep within system frameworks, allowing for privilege escalation that could enable full system compromise. This type of flaw typically involves buffer overflows, use-after-free conditions, or other memory management errors that corrupt the heap or stack, leading to unpredictable behavior and potential code execution.
The operational impact of CVE-2017-13861 extends beyond simple privilege escalation, as it can also result in denial of service conditions that render affected devices unstable or unusable. When exploited successfully, the memory corruption can cause system crashes, application hangs, or complete device reboot cycles that disrupt normal user operations. The vulnerability's ability to execute arbitrary code in privileged contexts makes it particularly dangerous as it could enable attackers to install malicious software, access sensitive user data, modify system files, or establish persistent backdoors on compromised devices. This makes the flaw attractive to both cybercriminals seeking to exploit devices for financial gain and nation-state actors targeting high-value victims.
Organizations and individuals should immediately apply the security updates released by Apple as part of iOS 11.2, tvOS 11.2, and watchOS 4.2 to remediate this vulnerability. The patch addresses the underlying memory management issues in the IOSurface component through improved bounds checking and memory allocation practices that prevent the exploitation conditions. System administrators should also monitor for any suspicious applications or unexpected device behavior that might indicate exploitation attempts. From a cybersecurity perspective, this vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and represents a classic example of a privilege escalation vulnerability that could be mapped to ATT&CK technique T1068, which covers locally executed malicious code. The flaw demonstrates the critical importance of maintaining up-to-date system firmware and the potential consequences of delayed security patching in mobile operating systems where users may be less likely to update regularly.