CVE-2018-12371

Description

An integer overflow vulnerability in the Skia library when allocating memory for edge builders on some systems with at least 16 GB of RAM. This results in the use of uninitialized memory, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR < 60.1, Thunderbird < 60, and Firefox < 61.

CVSS Metrics

• v3.1•HIGH•Score: 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
• v2.0•MEDIUM•Score: 6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.50%• Percentile: 66%

Techniques & Countermeasures

• CWE-190•Integer Overflow or Wraparound

  The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected Systems

• mozilla•firefox

  < 60.1.0 | < 61.0 | ≥ unspecified, < 61

• mozilla•firefox_esr

  ≥ unspecified, < 60.1

• mozilla•thunderbird

  < 60.0 | ≥ unspecified, < 60

References (4)

• https://www.mozilla.org/security/advisories/mfsa2018-16/
• https://www.mozilla.org/security/advisories/mfsa2018-15/
• https://www.mozilla.org/security/advisories/mfsa2018-19/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1465686