Rule Category

BROWSER-WEBKIT -- Snort has detected traffic known to exploit vulnerabilities present in the Webkit browser engine (aside from Chrome) this includes Apple’s Safari, RIM’s mobile browser, Nokia, KDE, Webkit itself, and Palm. Attacks often insert code via exploits, cause webkit renderings in the browser to crash, or otherwise create chaos or exploit for entrance.

Alert Message

BROWSER-WEBKIT Apple Safari WebKit out-of-bounds write attempt

Rule Explanation

This event is generated when there is an out-of-bounds write attempt to the AppleWebKit JavaScriptCore heap. Impact: Base Score: 8.8 HIGH Vector: AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H (V3 legend) Impact Score: 5.9 Exploitability Score: 2.8 Confidentiality (C): High Integrity (I): High Availability (A): High Details: This exploit manipulates controlled JSC objects in order to perform an out-of-bounds write on the JSC heap in AppleWebKit. This could lead to arbitrary remote code execution or denial of service by a crafted website. Ease of Attack: Medium.

What To Look For

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

MITRE ATT&CK Framework

Tactic:

Technique:

For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org

CVE

Additional Links

CVE Additional Information

CVE-2017-2505
An issue was discovered in certain Apple products. iOS before 10.3.2 is affected. Safari before 10.1.1 is affected. tvOS before 10.2.1 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site.
Details
Severity Base Score8.8
Impact Score5.9 Exploit Score2.8
Confidentiality ImpactHIGH Integrity ImpactHIGH
Availability ImpactHIGH Attack VectorNETWORK
ScopeUNCHANGED User InteractionREQUIRED
Authentication Ease of AccessLOW
Privileges RequiredNONE