CVE-2016-9063CWE-190

CVE-2016-9063

Critical · published June 12, 2018

CVSS v3.1
9.8
EPSS
5%
Percentile
92.6
In the wild
Unconfirmed
What it is

💡 An integer overflow sneaks in when the Expat library parses XML data in Firefox versions below 50. It’s like letting your car's fuel gauge read way past full—dangerously misleading! Think of it as reading a recipe where the ingredient amounts don’t add up. If you accidentally interpret one number too high, suddenly you're adding way too much salt! That's what happens here when the parsing goes awry and outputs unexpected values. This oversight could lead to unexpected behavior in the browser, potentially crashing the application or allowing for malformed data processing. While this may not be a direct attack vector, the implications of misparse can still lead to some chaotic scenarios for users.

Put simply

Think of it as reading a recipe where the ingredient amounts don’t add up. If you accidentally interpret one number too high, suddenly you're adding way too much salt! That's what happens here when the parsing goes awry and outputs unexpected values. The vulnerability manifests as an integer overflow during XML parsing in the Expat library, affecting versions of Firefox prior to 50. This flaw allows for unexpected data handling, resulting in possible instability.

What to do

This oversight could lead to unexpected behavior in the browser, potentially crashing the application or allowing for malformed data processing. While this may not be a direct attack vector, the implications of misparse can still lead to some chaotic scenarios for users. Make sure to update Firefox to version 50 or above to eliminate this vulnerability. If you’re using Expat directly, check for any patches or updates related to integer overflow handling. You've got this! By updating, you're taking a solid step towards a more secure browsing experience. 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.05363 · 92.6th percentile
Weakness
CWE-190 · Integer Overflow or Wraparound
Published
2018-06-12T01:29Z
Affected products (9)
ProductVersionsFixed in
mozilla/firefox< 5050
debian/debian_linuxall versions—
debian/debian_linuxall versions—
debian/debian_linuxall versions—
python/python≥ 2.7.0, < 2.7.152.7.15
python/python≥ 3.3.0, < 3.3.73.3.7
python/python≥ 3.4.0, < 3.4.73.4.7
python/python≥ 3.5.0, < 3.5.43.5.4
python/python≥ 3.6.0, < 3.6.23.6.2
References (12)
EPSS history
Timeline
  • 11 JUN 21:00Z
    An integer overflow during the parsing of XML using the Expat library
    cvelistv5