CVE-2023-42883 Overview
CVE-2023-42883 is a denial-of-service vulnerability in Apple's image processing components affecting Safari, macOS, iOS, iPadOS, watchOS, and tvOS. Processing a maliciously crafted image can trigger the flaw, resulting in service disruption on the target device. Apple addressed the issue through improved memory handling across multiple platform updates. The vulnerability also affects Debian Linux distributions that bundle WebKit-based components. The flaw requires local access and user interaction, limiting remote exploitation paths.
Critical Impact
Processing a crafted image triggers a denial-of-service condition, disrupting application or system availability on affected Apple platforms and Debian Linux systems.
Affected Products
- Apple Safari (prior to 17.2)
- Apple macOS Sonoma (prior to 14.2), iOS/iPadOS (prior to 17.2 and 16.7.3), watchOS (prior to 10.2), tvOS (prior to 17.2)
- Debian Linux 11 and 12
Discovery Timeline
- 2023-12-12 - CVE-2023-42883 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2023-42883
Vulnerability Analysis
The vulnerability resides in image processing logic within Apple's media handling components. When the affected code parses a malformed image file, it mishandles memory, leading to a denial-of-service condition. Apple's advisory states the fix involved improved memory handling, indicating the original code did not adequately validate boundary conditions or resource allocations during image decoding.
The flaw requires the victim to open or render a crafted image. Because the attack vector is local with required user interaction, an attacker must deliver the malicious image through a channel that triggers parsing, such as a downloaded file or embedded web content rendered through Safari or WebKit.
The NVD classifies this issue under [NVD-CWE-noinfo] due to limited public technical disclosure. Apple's advisories across HT214034, HT214035, and HT214036 describe the resolution without exposing exploitation specifics.
Root Cause
The root cause is improper memory handling during image processing. The vulnerable parser fails to safely manage memory when encountering specific image structures, producing instability that terminates the responsible process or service.
Attack Vector
Exploitation requires local delivery of a crafted image and user interaction to trigger processing. Attackers can host malicious images on websites, embed them in messages, or distribute them as file attachments. Rendering the image through Safari, Preview, or another affected component triggers the denial-of-service condition.
No public proof-of-concept code or exploit is documented in the enriched data. The EPSS score of 0.021% indicates an extremely low predicted exploitation likelihood in the near term.
Detection Methods for CVE-2023-42883
Indicators of Compromise
- Unexpected crashes of Safari, WebKit-based processes, or image rendering services after opening images from untrusted sources
- Crash reports referencing ImageIO, CoreGraphics, or WebKit image decoders
- Repeated process termination events when previewing files from email, messaging, or web downloads
Detection Strategies
- Monitor endpoint crash telemetry for recurring faults in image processing libraries on macOS and iOS devices
- Correlate crash events with recent file downloads or browser activity to identify potential delivery vectors
- Review Safari and WebKit diagnostic reports for memory-related termination signatures tied to image decoding
Monitoring Recommendations
- Aggregate macOS unified logs and crash reporter output into a centralized log platform for cross-device analysis
- Track Apple software version inventory across the fleet to identify endpoints running pre-patch builds
- Alert on anomalous volumes of image files arriving through email gateways or messaging platforms
How to Mitigate CVE-2023-42883
Immediate Actions Required
- Update Safari to 17.2 or later on all supported macOS systems
- Upgrade macOS to Sonoma 14.2, iOS/iPadOS to 17.2, watchOS to 10.2, and tvOS to 17.2
- Apply iOS 16.7.3 or iPadOS 16.7.3 on devices that cannot move to the 17.x branch
- Apply Debian Security Advisory DSA-5580 on affected Debian 11 and 12 systems
Patch Information
Apple released fixes across multiple platforms on December 11, 2023. Refer to Apple Support HT214034, HT214035, HT214036, HT214039, HT214040, and HT214041 for platform-specific details. Debian published DSA-5580 covering the WebKit-related fix.
Workarounds
- Avoid opening image files from untrusted senders or unverified websites until patches are applied
- Restrict automatic image previews in mail clients and messaging applications on unpatched devices
- Enforce mobile device management (MDM) policies that require minimum OS versions matching the fixed releases
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
