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Sid 1-45733


BROWSER-WEBKIT Apple Safari Webkit button first-letter style rendering code execution attempt


This event is generated when a use-after-free condition is exploited in Apple Safari Webkit.


Attempted User Privilege Gain


CVSS base score 9.3

CVSS impact score 10.0

CVSS exploitability score 8.6

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

Detailed information

CVE-2010-1392: Use-after-free vulnerability in WebKit in Apple Safari before 5.0 on Mac OS X 10.5 through 10.6 and Windows, and before 4.1 on Mac OS X 10.4, allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via vectors related to HTML buttons and the first-letter CSS style.

Affected systems

  • apple safari 4.0
  • apple safari 4.0.0b
  • apple safari 4.0.1
  • apple safari 4.0.2
  • apple safari 4.0.3
  • apple safari 4.0.4
  • apple safari 4.0.5
  • apple webkit *

Ease of attack


Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

False positives

False negatives

Corrective action


  • Cisco's Talos Intelligence Group

Additional References