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CVE-2015-4495

Mozilla — Mozilla Firefox Security Feature Bypass Vulnerability

Mozilla · CWE-346 · in CISA KEV since 2022-05-25

KEV since 2022 · listed over a yearCISA KEVActively Exploited
77

EVRS 77 of 100 Urgent

Patch This Cycle

Rank 656 of 2,960 tracked

Download PDF

Why it scores 77

Evidence available: 6 of 7 signals

Listed in the CISA KEV catalog, and an EPSS probability of 0.686.

  • CISA KEVApplied
  • RansomwareDid not apply
  • Vendor exploitationDid not apply
  • EPSSApplied
  • Microsoft Exploitability IndexNot applicable
  • Pre-patch disclosureNo data
  • KEV recencyDid not apply
  • CVSSApplied

The band answers “how soon”, not “how bad”. No data for: Pre-patch disclosure. Why some signals show no data

Fix

Patch or fixed version identified

CISA required action

Fixed in

firefox -> 39.0.3+build2-0ubuntu0.14.04.1 | pdf.js -> 1.1.366+dfsg-1

Affected versions

  • firefox< 39.0.3>= 38.0 < 38.1.1
  • linux enterprise debuginfo11
  • firefox os< 2.2
  • solaris11.3
  • ubuntu linux12.0414.0415.04
  • enterprise linux desktop5.06.07.0
  • enterprise linux eus6.77.17.27.37.47.57.67.7
  • enterprise linux server5.06.07.0

+7 more affected products; see the full list at NVD.

Remediation

Apply updates per vendor instructions.

Fixed versions from NVD.

Evidence

Each value with its source
MeasureValueSource
CVSS base scoreHow severe the flaw is in itself. It does not say how likely an attack is. 8.8 NVD
FIRST EPSSFIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs. 0.686 (99.34th pctl) FIRST EPSS
Actively exploitedWhether a source of record has confirmed attacks using it in the wild. Confirmed CISA KEV
Ransomware campaign useWhether CISA has seen ransomware operators use it. Unknown or none CISA KEV
CISA remediation deadlineThe date US federal agencies must have fixed or mitigated it. 2022-06-15 · KEV since 2022 · listed over a year CISA KEV
Public exploit moduleA module existing is not the same as active exploitation. Public module exists Metasploit
EUVD cross-referenceENISA's record: CVSS 8.8 (v3.1), assigned by mozilla. Listed ENISA EUVD

Description

NVD

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypass the Same Origin Policy, and read arbitrary files or gain privileges, via vectors involving crafted JavaScript code and a native setter, as exploited in the wild in August 2015.

What CISA says to do

Public module

Metasploit lists a public normal-rank module for this CVE: Firefox PDF.js Browser File Theft (gather/firefox_pdfjs_file_theft). A module existing is not the same as active exploitation; see metasploit.com.