Webkit Floating Point Datatype Remote Code Execution Vulnerability



Date Discovered

September 7, 2010


WebKit is prone to a remote code-execution vulnerability. Successful exploits will allow an attacker to run arbitrary code in the context of the user running the application. Failed attacks will cause denial-of-service conditions. Versions prior to Safari 5.0.2 and Safari 4.1.2 are vulnerable.

Technologies Affected

  • Apple Safari 4
  • Apple Safari 4 Beta
  • Apple Safari 4 For Windows
  • Apple Safari 4.0.1
  • Apple Safari 4.0.2
  • Apple Safari 4.0.2 For Windows
  • Apple Safari 4.0.3
  • Apple Safari 4.0.3 For Windows
  • Apple Safari 4.0.4
  • Apple Safari 4.0.4 For Windows
  • Apple Safari 4.0.5
  • Apple Safari 4.0.5 For Windows
  • Apple Safari 4.1
  • Apple Safari 4.1.1
  • Apple Safari 5.0
  • Apple Safari 5.0 For Windows
  • Apple Safari 5.0.1
  • Apple Safari 5.0.1 for Windows
  • Apple iOS 3.2
  • Apple iOS 3.2.1
  • Apple iOS 3.2.2
  • Apple iOS 4
  • Apple iOS 4.0.1
  • Apple iOS 4.0.2
  • Apple iOS 4.1
  • Apple iOS 4.2 beta
  • Apple iPad 3.2
  • Apple iPad 3.2.1
  • Apple iPad 3.2.2
  • Apple iPad
  • Apple iPhone 2.0
  • Apple iPhone 2.0.1
  • Apple iPhone 2.0.2
  • Apple iPhone 2.1
  • Apple iPhone 2.2
  • Apple iPhone 2.2.1
  • Apple iPhone 3.0
  • Apple iPhone 3.0.1
  • Apple iPhone 3.1
  • Apple iPhone 3.1.2
  • Apple iPhone 3.1.3
  • Apple iPhone 3.2
  • Apple iPhone 3.2.1
  • Apple iPhone 4.0
  • Apple iPhone 4.0.1
  • Apple iPhone 4.1
  • Apple iPod Touch 2.1
  • Apple iPod Touch 2.2
  • Apple iPod Touch 2.2.1
  • Apple iPod Touch 3.0
  • Apple iPod Touch 3.1.1
  • Apple iPod Touch 3.1.2
  • Apple iPod Touch 3.1.3
  • Fedoraproject Fedora 12
  • Fedoraproject Fedora 13
  • Gentoo Linux
  • Mandriva Linux Mandrake 2010.1
  • Mandriva Linux Mandrake 2010.1 X86 64
  • Open Handset Alliance Android 2.0.1
  • Open Handset Alliance Android 2.1
  • Redhat Enterprise Linux Desktop 6
  • Redhat Enterprise Linux Desktop Optional 6
  • Redhat Enterprise Linux HPC Node Optional 6
  • Redhat Enterprise Linux Server 6
  • Redhat Enterprise Linux Server Optional 6
  • Redhat Enterprise Linux Workstation 6
  • Redhat Enterprise Linux Workstation Optional 6
  • SuSE openSUSE 11.2
  • SuSE openSUSE 11.3
  • Ubuntu Ubuntu Linux 10.04 Amd64
  • Ubuntu Ubuntu Linux 10.04 I386
  • Ubuntu Ubuntu Linux 10.04 Powerpc
  • Ubuntu Ubuntu Linux 10.04 Sparc
  • Ubuntu Ubuntu Linux 10.10 amd64
  • Ubuntu Ubuntu Linux 10.10 i386
  • Ubuntu Ubuntu Linux 10.10 powerpc
  • Ubuntu Ubuntu Linux 9.10 Amd64
  • Ubuntu Ubuntu Linux 9.10 I386
  • Ubuntu Ubuntu Linux 9.10 Lpia
  • Ubuntu Ubuntu Linux 9.10 Powerpc
  • Ubuntu Ubuntu Linux 9.10 Sparc
  • WebKit Open Source Project WebKit 1.2.2
  • WebKit Open Source Project WebKit 1.2.2-1
  • WebKit Open Source Project WebKit 1.2.3
  • WebKit Open Source Project WebKit


Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Set web browser security to disable the execution of script code or active content.
Since a successful exploit of this issue requires malicious code to execute in web clients, consider disabling support for script code and active content within the client browser. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.

Implement multiple redundant layers of security.
Various memory-protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker's ability to exploit this vulnerability to execute arbitrary code.

Updates are available. Please see the references for more information.



Luke Wagner of Mozilla

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