CVE-2019-11758

Description

Mozilla community member Philipp reported a memory safety bug present in Firefox 68 when 360 Total Security was installed. This bug showed evidence of memory corruption in the accessibility engine and we presume that with enough effort that it could be exploited to run arbitrary code. This vulnerability affects Firefox < 69, Thunderbird < 68.2, and Firefox ESR < 68.2.

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: 0.81%• Percentile: 75%

Techniques & Countermeasures

• CWE-787•Out-of-bounds Write

  The product writes data past the end, or before the beginning, of the intended buffer.

Affected Systems

• canonical•ubuntu_linux

  16.04

• mozilla•firefox

  < 69.0 | < 69

• mozilla•firefox_esr

  < 68.2

• mozilla•thunderbird

  < 68.2

References (5)

• https://www.mozilla.org/security/advisories/mfsa2019-25/
• https://www.mozilla.org/security/advisories/mfsa2019-35/
• https://www.mozilla.org/security/advisories/mfsa2019-33/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1536227
• https://usn.ubuntu.com/4335-1/