CVE-2017-6997 in watchOS
Summary
by MITRE
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. tvOS before 10.2.1 is affected. watchOS before 3.2.2 is affected. The issue involves the "AVEVideoEncoder" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
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Analysis
by VulDB Data Team • 10/12/2024
The vulnerability identified as CVE-2017-6997 represents a critical security flaw within Apple's multimedia processing stack affecting multiple operating systems including iOS, tvOS, and watchOS. This vulnerability resides within the AVEVideoEncoder component which is responsible for video encoding operations within Apple's ecosystem. The flaw manifests as a memory corruption issue that can be exploited by malicious applications to gain elevated privileges or cause system instability. The vulnerability affects iOS versions prior to 10.3.2, tvOS versions prior to 10.2.1, and watchOS versions prior to 3.2.2, indicating a widespread impact across Apple's mobile and wearable platforms. The security implications are particularly concerning given that the flaw allows for arbitrary code execution in a privileged context, meaning attackers could potentially bypass system security measures and gain deeper access to device functionality.
The technical nature of this vulnerability aligns with CWE-119, which describes "Improper Access to Memory" and specifically addresses issues where insufficient bounds checking allows for memory corruption. The AVEVideoEncoder component likely processes video data through memory-intensive operations that do not properly validate input parameters or handle edge cases in memory allocation. When a crafted malicious application interacts with this component, it can manipulate memory structures in ways that lead to either unauthorized code execution or system crashes. This type of vulnerability typically arises from buffer overflow conditions, use-after-free errors, or improper memory management practices within the video encoding pipeline. The privilege escalation aspect suggests that the vulnerability may leverage a kernel-level or system-level component within the video encoder that operates with elevated permissions, allowing attackers to execute malicious code with the privileges of system processes rather than standard application privileges.
The operational impact of CVE-2017-6997 extends beyond simple denial of service scenarios to encompass potential full system compromise. Attackers could develop malicious applications that exploit this vulnerability to install persistent backdoors, access sensitive user data, or perform unauthorized system modifications. The memory corruption nature of the flaw means that successful exploitation could lead to unpredictable system behavior including crashes, reboots, or more insidiously, silent privilege escalation that goes undetected by normal security monitoring. Given that these affected versions were widely deployed across Apple's user base, the potential attack surface was substantial. The vulnerability demonstrates how multimedia processing components, which are often complex and resource-intensive, can introduce security risks that are difficult to detect and mitigate. This type of flaw is particularly dangerous in mobile environments where users frequently download applications from app stores and may not be aware of the underlying security implications of their software choices.
Mitigation strategies for CVE-2017-6997 primarily focus on immediate system updates and user awareness. Apple addressed this vulnerability through security updates that patched the AVEVideoEncoder component and improved memory validation processes. Organizations and individuals should prioritize updating to the affected operating system versions, specifically iOS 10.3.2, tvOS 10.2.1, and watchOS 3.2.2. The vulnerability also highlights the importance of application vetting processes, as attackers could potentially exploit this flaw through malicious applications distributed through official app stores. System administrators should implement monitoring for unusual memory consumption patterns or application behavior that might indicate exploitation attempts. From a defensive perspective, this vulnerability reinforces the need for robust input validation and memory management practices in multimedia processing components. The ATT&CK framework categorizes this type of vulnerability under privilege escalation techniques where attackers leverage software flaws to gain elevated system privileges, making it a critical concern for both endpoint security and mobile device management strategies. Regular security assessments of multimedia processing stacks and comprehensive vulnerability management programs become essential to prevent similar issues from emerging in the future.