Apple Safari Remote Memory Corruption Vulnerability
2009.June.09

Fortinet's FortiGuard Global Security Research Team Discovers Vulnerability in Apple Safari.

Summary:

A memory corruption vulnerability exists in Apple Safari which allows a remote attacker to execute
arbitrary code through a malicious webpage.

Impact:

Remote Code Execution.

Risk:

Critical

Affected Software:

For a list of product versions affected, please see the Apple Security Update reference below.

Additional Information:

The memory corruption vulnerability occurs when handling HTML table elements. A remote attacker
may craft a malicious webpage and lure an unsuspecting user. When the page is viewed and these
elements are processed, arbitrary code execution may occur resulting in the victims machine being
compromised.

Solutions:

Apple security updates are available via their Software Update mechanism.
Apple security updates are available for manual download here.
The FortiGuard Global Security Research Team released a signature
"DHTML.Malicious.Table.Elements", which covers this specific vulnerability.

Fortinet customers who subscribe to Fortinet's intrusion prevention (IPS) service should be
protected against this memory corruption vulnerability. Fortinet's IPS service is one component of
FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web
content filtering and antispam capabilities. These services enable protection against threats on
both application and network layers. FortiGuard Services are continuously updated by the FortiGuard
Global Security Research Team, which enables Fortinet to deliver a combination of multi-layered
security intelligence and true zero-day protection from new and emerging threats. These updates are
delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows
responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.

References:

FortiGuard Advisory: http://www.fortiguardcenter.com/advisory/FGA-2009-23.html
Apple Security Updates for Safari 4.0: http://support.apple.com/kb/HT3613
Apple Security Updates for iPhone: http://support.apple.com/kb/HT3318
CVE ID: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4231

Acknowledgement:

Haifei Li of Fortinet's FortiGuard Global Security Research Team

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