(Pwn2Own) Mozilla Firefox Bounds Check Elimination Remote Code Execution Vulnerability

April 3rd, 2015
ZDI-15-109 ZDI-CAN-2830

CVE ID

CVE-2015-0817

CVSS Score

6.8 AV:N/AC:M/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 heap access bounds checking. A specially crafted typed array can eliminate bounds checks for heap accesses. An attacker can leverage this vulnerability to execute code under the context of the current process.

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=1145255

Disclosure Timeline

  • 2015-03-19 - Vulnerability reported to vendor
  • 2015-04-03 - Coordinated public release of advisory

Credit

i1xu1a

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