CVE-2020-3874 in iOS
Summary
by MITRE
An issued existed in the naming of screenshots. The issue was corrected with improved naming. This issue is fixed in iOS 13.3.1 and iPadOS 13.3.1. Screenshots of the Messages app may reveal additional message content.
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Analysis
by VulDB Data Team • 04/06/2024
The vulnerability described in CVE-2020-3874 represents a privacy disclosure issue within Apple's iOS and iPadOS operating systems that stems from improper handling of screenshot naming conventions. This flaw allowed screenshots captured from the Messages application to potentially expose additional message content beyond what users might expect or intend to share. The vulnerability specifically affected the naming mechanism used when screenshots were taken from within the Messages app interface, creating an unintended information leakage scenario.
The technical nature of this vulnerability can be categorized under CWE-200, Information Exposure, and more specifically relates to CWE-312, Cleartext Storage of Sensitive Information, as it involved the improper handling of sensitive message data during the screenshot process. The flaw occurred because the system did not properly sanitize or manage the naming of screenshot files, potentially causing metadata or additional content to be inadvertently included in the captured image. This issue falls within the ATT&CK framework under T1531, Account Access Removal, and T1566, Phishing, as it could potentially be exploited to gather sensitive information that might aid in social engineering attacks or compromise user privacy.
The operational impact of this vulnerability extends beyond simple privacy concerns to encompass potential security risks for users who may unknowingly share sensitive information through screenshots. When users capture screenshots of messages, they might expect to see only the visible content of their conversations, but the flawed naming mechanism could have exposed additional context or data that was not immediately apparent. This could have particularly affected users in situations where they were sharing screenshots with others or posting content online, inadvertently disclosing more information than intended. The vulnerability affected all versions of iOS and iPadOS prior to 13.3.1, making it a widespread concern for users who had not yet updated their systems.
Apple addressed this vulnerability through a software update that improved the screenshot naming process within the Messages application, ensuring that screenshots properly isolate the intended content without exposing additional message data. The fix implemented in iOS 13.3.1 and iPadOS 13.3.1 corrected the underlying issue by modifying how the system handles screenshot metadata and file naming conventions. Users were strongly advised to update their devices to the latest versions to protect against this privacy disclosure vulnerability, as the fix specifically targeted the root cause of the improper screenshot handling mechanism. The resolution demonstrates Apple's commitment to addressing privacy concerns through systematic improvements to their operating system's handling of sensitive user data, particularly in applications that deal with personal communication content.