Advisory Details

August 31st, 2015

Mozilla Firefox nsIPresShell Use-After-Free Remote Code Execution Vulnerability

ZDI-15-406
ZDI-CAN-2938

CVE ID CVE-2015-4497
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 usage of nsIPresShell. By manipulating a document's elements an attacker can force a dangling pointer to be reused after it has been freed. 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://www.mozilla.org/en-US/security/advisories/mfsa2015-94/
DISCLOSURE TIMELINE
  • 2015-06-16 - Vulnerability reported to vendor
  • 2015-08-31 - Coordinated public release of advisory
CREDIT Ucha Gobejishvili
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