CVE-2019-11759

Description

An attacker could have caused 4 bytes of HMAC output to be written past the end of a buffer stored on the stack. This could be used by an attacker to execute arbitrary code or more likely lead to a crash. This vulnerability affects Firefox < 70, 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: 2.13%• Percentile: 84%

Techniques & Countermeasures

• CWE-120•Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

  The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

Affected Systems

• canonical•ubuntu_linux

  16.04

• mozilla•firefox

  < 70.0 | < 70

• mozilla•firefox_esr

  < 68.2

• mozilla•thunderbird

  < 68.2

References (6)

• https://www.mozilla.org/security/advisories/mfsa2019-35/
• https://www.mozilla.org/security/advisories/mfsa2019-33/
• https://www.mozilla.org/security/advisories/mfsa2019-34/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1577953
• https://security.gentoo.org/glsa/202003-10
• https://usn.ubuntu.com/4335-1/