External risk intelligence

Apple Software Vulnerability May Allow Code Execution

CVE advisoryKnown Exploit

CVE-2021-1870

A logic issue in Apple software and WebKit allows for arbitrary code execution, posing a risk to affected organizations by potentially compromising data and operations. Attackers can exploit this vulnerability remotely, impacting systems that process web content. Organizations should apply vendor updates to mitigate th

4Halo Surface Signal

Apple Ipados

before 14.410.15 to before 10.15.710.15.711.0.1 to before 11.2before 2.30.63233

External exposure likelihood

Halo Surface Signal score for CVE-2021-1870

This vulnerability affects WebKit, a core component for web rendering in browsers and various applications across macOS, iOS, iPadOS, and other software distributions. Because WebKit is fundamentally designed to process untrusted web content from the public internet, it represents a commonly reachable attack surface through standard web browsing and web-content-driven application usage.

Horizon Alert

Summary of the vulnerability and why it matters

A logic issue within Apple's operating systems and WebKit could allow unauthorized code execution. This flaw impacts systems processing web content. Organizations relying on these systems face potential risks to their data and operations.

  • Vulnerable: Apple operating systems, WebKit
  • Flaw: Logic issue in web content processing
  • Impact: Arbitrary code execution

Attack Path

How an attacker could exploit the issue

This vulnerability allows a remote attacker to execute arbitrary code through a logic issue in WebKit. The attacker can exploit this by tricking a user into visiting a malicious website or interacting with specially crafted web content. Successful exploitation could lead to unauthorized code execution on the affected system.

  • Exposure condition: Malicious website or web content.
  • Attacker starting point: Network.
  • Trigger and result: Code execution.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability presented a significant risk due to its potential for arbitrary code execution and reports of active exploitation. The attack vector allowed remote attackers to exploit this issue without requiring any specific access or conditions. The widespread use of affected Apple software and the WebKit component means that a large number of organizations and their users could have been impacted.

  • Attackers with common skills.
  • No special access or conditions needed.
  • High business risk; urgent action advised.

Priority actions

Operational Fix

Recommended remediation, mitigation, and detection steps

A critical logic issue in WebKit has been addressed by Apple. This vulnerability could allow a remote attacker to execute arbitrary code, and there are reports of active exploitation. Organizations using affected Apple operating systems and potentially other software that relies on WebKit should take immediate steps to manage this risk.

  • Identify all systems running affected versions.
  • Isolate or limit exposure where possible.
  • Apply vendor updates and validate remediation.
  • Monitor for related activity.

Frequently asked questions

What is WebKit's role in Apple software like iOS and macOS, and how does it handle web content?

WebKit serves as the browser engine for Safari and is integrated into numerous applications across Apple's iOS, iPadOS, and macOS. Its primary function is to render web pages, interpret HTML, and manage other web technologies necessary for application interaction with web content.

What type of weakness does CVE-2021-1870 represent, and what is its impact?

CVE-2021-1870 is classified as a logic issue within WebKit. This vulnerability stems from flaws in the software's information processing and decision-making capabilities, potentially enabling an attacker to manipulate its behavior and achieve unintended outcomes, including code execution.

How can an attacker exploit CVE-2021-1870, and what is the scope of the attack?

A remote attacker can exploit this vulnerability by enticing a user to visit a malicious website or interact with specially crafted web content. Successful exploitation can lead to arbitrary code execution on the affected system, as the attack vector is network-based with no privileges or user interaction required.

What is the significance of CVE-2021-1870, especially concerning active exploitation?

CVE-2021-1870 is a critical vulnerability with reports of active exploitation. Its ability to allow remote code execution without special access conditions, combined with the widespread use of affected Apple software and WebKit, presented a significant risk to many organizations and users.

What actions should organizations take to address CVE-2021-1870?

Organizations should identify all systems running affected versions of Apple software and WebKit. It is recommended to apply vendor-provided updates promptly, monitor for related suspicious activity, and consider isolating or limiting exposure for critical systems until remediation is complete.

References