CVE-2023-42890 Overview
CVE-2023-42890 is a memory handling vulnerability in Apple WebKit that affects multiple Apple products including Safari, macOS, iOS, iPadOS, tvOS, and watchOS. The vulnerability exists in the web content processing component and can be exploited when a user visits a malicious website containing specially crafted web content. Successful exploitation allows an attacker to execute arbitrary code on the affected device with the privileges of the targeted user.
This vulnerability represents a significant security risk across the Apple ecosystem, as WebKit serves as the rendering engine for Safari and is used by all web content displayed on iOS and iPadOS devices. The network-based attack vector combined with the potential for complete system compromise makes this a priority vulnerability for remediation.
Critical Impact
Processing maliciously crafted web content may lead to arbitrary code execution, potentially allowing attackers to compromise affected Apple devices through drive-by attacks.
Affected Products
- Apple Safari (versions prior to 17.2)
- Apple macOS Sonoma (versions prior to 14.2)
- Apple iOS and iPadOS (versions prior to 17.2)
- Apple tvOS (versions prior to 10.2)
- Apple watchOS (versions prior to 10.2)
Discovery Timeline
- December 12, 2023 - CVE-2023-42890 published to NVD
- November 21, 2024 - Last updated in NVD database
Technical Details for CVE-2023-42890
Vulnerability Analysis
CVE-2023-42890 is classified as a Code Injection vulnerability (CWE-94) stemming from improper memory handling within the WebKit rendering engine. The vulnerability exists in how WebKit processes certain web content, where malformed or specially crafted data can trigger memory corruption conditions during rendering operations.
When WebKit parses and renders web content, certain memory management operations fail to properly validate or handle specific inputs. This creates an exploitable condition where an attacker can craft malicious web content that, when processed by the vulnerable WebKit engine, causes memory corruption leading to arbitrary code execution.
The attack requires user interaction in the form of visiting a malicious webpage or loading attacker-controlled web content. Given WebKit's pervasive use across Apple's operating systems—including as the mandatory rendering engine for all browsers on iOS—this vulnerability presents a broad attack surface affecting millions of devices.
Root Cause
The root cause of CVE-2023-42890 is improper memory handling within WebKit's web content processing routines. Apple's security advisory indicates the issue was addressed with "improved memory handling," suggesting the underlying problem involved memory allocation, deallocation, or boundary checking failures during the parsing or rendering of web content.
Memory handling vulnerabilities in browser engines typically arise from complex interactions between JavaScript execution, DOM manipulation, and the rendering pipeline. These components must carefully manage memory across numerous objects with varying lifetimes, and failures in this coordination can lead to exploitable memory corruption conditions.
Attack Vector
The attack vector for CVE-2023-42890 is network-based and requires user interaction. An attacker can exploit this vulnerability through the following scenarios:
Drive-by Download Attack: An attacker hosts malicious web content on a controlled server or injects it into a compromised legitimate website. When a victim navigates to the page using a vulnerable browser, the malicious content triggers the memory handling flaw, potentially achieving code execution.
Malicious Advertisement: Attackers can leverage advertising networks to distribute malicious content, reaching victims through legitimate websites displaying compromised advertisements.
Phishing Campaigns: Social engineering techniques can be employed to direct victims to attacker-controlled pages hosting the exploit payload.
The exploitation mechanism involves crafting specific web content that causes WebKit to mishandle memory during processing. While the exact technical details of the exploitation have not been publicly disclosed, successful exploitation grants the attacker the ability to execute arbitrary code within the context of the affected application.
Detection Methods for CVE-2023-42890
Indicators of Compromise
- Unexpected browser crashes or Safari becoming unresponsive during web browsing sessions
- Unusual network connections originating from Safari or other WebKit-based applications
- Signs of unauthorized code execution following web browsing activity
- Unexpected child processes spawned by Safari or other WebKit-dependent applications
Detection Strategies
- Monitor for abnormal WebKit process behavior including unexpected memory allocation patterns
- Implement endpoint detection solutions capable of identifying memory corruption exploitation attempts
- Enable crash reporting and analyze WebKit-related crashes for signs of exploitation attempts
- Deploy network-based intrusion detection to identify known malicious web content delivery
Monitoring Recommendations
- Maintain comprehensive logging of web browsing activities across enterprise devices
- Utilize SentinelOne's Singularity platform to detect and respond to exploitation attempts in real-time
- Monitor Apple Security Advisories for updated indicators related to this vulnerability
- Review the Openwall OSS Security Post for additional technical context
How to Mitigate CVE-2023-42890
Immediate Actions Required
- Update all Apple devices to the patched versions: Safari 17.2, macOS Sonoma 14.2, iOS/iPadOS 17.2, tvOS 10.2, and watchOS 10.2
- Enable automatic software updates on all Apple devices to ensure timely patch deployment
- Review enterprise mobile device management policies to enforce minimum OS version requirements
- Educate users about the risks of visiting untrusted websites until patches are deployed
Patch Information
Apple has released security updates addressing CVE-2023-42890 across all affected products. Organizations should prioritize deploying these updates immediately:
- Safari 17.2 - Apple Support Article HT214039
- macOS Sonoma 14.2 - Apple Support Article HT214036
- iOS 17.2 and iPadOS 17.2 - Apple Support Article HT214035
- tvOS 17.2 - Apple Support Article HT214040
- watchOS 10.2 - Apple Support Article HT214041
Linux distributions using WebKitGTK should refer to the Gentoo GLSA 202401-33 for applicable patches.
Workarounds
- Restrict web browsing to trusted sites only until patches can be applied
- Consider using content filtering solutions to block access to potentially malicious websites
- Disable JavaScript execution where feasible to reduce the attack surface (note: this will impact website functionality)
- Deploy network-level web filtering to block known malicious domains and content
# Verify Safari version on macOS
/Applications/Safari.app/Contents/MacOS/Safari --version
# Check macOS version
sw_vers -productVersion
# On iOS devices, verify version via:
# Settings > General > About > Software Version
# Ensure version is 17.2 or later
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
