Advisory Details

March 26th, 2012

Webkit fontface Invalid Font Family Remote Code Execution Vulnerability

ZDI-12-054
ZDI-CAN-1283

CVE ID CVE-2011-2825
CVSS SCORE 7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
AFFECTED VENDORS WebKit.Org
AFFECTED PRODUCTS WebKit
VULNERABILITY DETAILS


This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Webkit. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.

The specific flaw exists within the parsing and utilization of font objects. When the code parses the @font-face CSS element it does not validate that the font-family is legitimate. Later, if the same font-family is applied within CSS the code will access an invalid element of its internal font object. This can be leveraged by a remote attacker to execute code under the context of the user running the browser.

VENDOR RESPONSE WebKit.Org has issued an update to correct this vulnerability. More details can be found at:
http://support.apple.com/kb/HT5190
DISCLOSURE TIMELINE
  • 2011-07-06 - Vulnerability reported to vendor
  • 2012-03-26 - Coordinated public release of advisory
CREDIT wushi of team509
miaubiz
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