(Pwn2Own) Mozilla Firefox resource: URL Remote Code Execution Vulnerability

April 3rd, 2015
ZDI-15-110 ZDI-CAN-2826

CVE ID

CVE-2015-0816

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 execute arbitrary code 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 documents loaded through the resource: URL. As the same flag was used for chrome: and resource: URLs, these pages were able to subsequently load privileged chrome pages. By combining this with a same-origin policy bypass, an attacker could execute arbitrary code in the context of the current user.

Additional Details

Mozilla has issued an update to correct this vulnerability. More details can be found at:
https://www.mozilla.org/en-US/security/advisories/mfsa2015-33/

Disclosure Timeline

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

Credit

Mariusz Mlynski

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