Full Report
Apple on Tuesday released a security update to address a zero-day flaw that it said has been exploited in "extremely sophisticated" attacks. The vulnerability has been assigned the CVE identifier CVE-2025-24201 and is rooted in the WebKit web browser engine component. It has been described as an out-of-bounds write issue that could allow an attacker to craft malicious web content such that it
Analysis Summary
# Vulnerability: WebKit Out-of-Bounds Write Leading to Sandbox Escape
## CVE Details
- CVE ID: CVE-2025-24201
- CVSS Score: Not explicitly mentioned (Implied High due to N-day exploitation)
- CWE: Out-of-bounds Write (Implied)
## Affected Systems
- Products: WebKit (Web Browser Engine component)
- Versions: Versions of iOS and iPadOS prior to iOS 17.2 (where initial mitigation occurred). Specific vulnerable client versions are not explicitly listed, but the fix applies to versions released on or after patched versions.
- Configurations: Any device running vulnerable OS versions making use of the affected WebKit component.
## Vulnerability Description
The vulnerability is an out-of-bounds write flaw within the WebKit web browser engine component. Successful exploitation allows an attacker to craft malicious web content that can bypass the Web Content sandbox, leading to a sandbox escape. This issue is noted as a supplementary fix to an attack previously mitigated in iOS 17.2.
## Exploitation
- Status: Exploited in the wild (Described as used in an "extremely sophisticated attack against specific targeted individuals" on pre-iOS 17.2 versions).
- Complexity: High (Implied by the description "extremely sophisticated attack").
- Attack Vector: Network (via malicious web content).
## Impact
- Confidentiality: Likely High (Sandbox escape enables access to sensitive resources).
- Integrity: Likely High (Ability to execute arbitrary code or tamper with processes).
- Availability: Potential Medium/High (Depending on the nature of the exploit payload).
## Remediation
### Patches
Patches have been released for the following platforms:
- **iOS and iPadOS:** 18.3.2
- **macOS:** Sequoia 15.3.2
- **Safari (on older macOS):** 18.3.1 (For Macs running macOS Ventura and macOS Sonoma)
- **visionOS:** 2.3.2
### Workarounds
No specific workarounds were mentioned in the context provided, other than updating to the patched versions. Given the severity, immediate updating is the primary mitigation.
## Detection
- Detection methods rely on identifying artifacts or behaviors associated with the exploitation of this specific WebKit vulnerability or monitoring for subsequent actions following a successful sandbox escape, though specific IoCs were not published.
- Organizations should focus detection on systems running unpatched versions executing WebKit-rendering code from untrusted sources.
## References
- Vendor Advisory (Patch URL): support.apple.com/en-us/100100 (Defanged: support[.]apple[.]com/en-us/100100)
- iOS/iPadOS Advisory: support[.]apple[.]com/en-us/122281
- macOS Sequoia Advisory: support[.]apple[.]com/en-us/122283
- Safari Advisory: support[.]apple[.]com/en-us/122285
- visionOS Advisory: support[.]apple[.]com/en-us/122284