(Pwn2Own) Mozilla Firefox SVG DOMAttrModified Same-Origin Policy Bypass Vulnerability

April 3rd, 2015
ZDI-15-108 ZDI-CAN-2825

CVE ID

CVE-2015-0818

CVSS Score

7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected Vendors

Mozilla

Affected Products

Firefox

Vulnerability Details


This vulnerability allows remote attackers to bypass the same-origin policy on vulnerable installations of Mozilla Firefox. 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 handling of SVG format content navigation. By using a DOMAttrModified mutation event listener, an attacker can inject an arbitrary URL into the history, and cause Firefox to break the same-origin isolation policy.

Additional Details

Mozilla has issued an update to correct this vulnerability. More details can be found at:
https://bugzilla.mozilla.org/show_bug.cgi?id=1144988

Disclosure Timeline

  • 2015-03-18 - Vulnerability reported to vendor
  • 2015-04-03 - Coordinated public release of advisory

Credit

Mariusz Mlynski

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