CVE-2019-9793 Information

Description

A mechanism was discovered that removes some bounds checking for string array or typed array accesses if Spectre mitigations have been disabled. This vulnerability could allow an attacker to create an arbitrary value in compiled JavaScript for which the range analysis will infer a fully controlled incorrect range in circumstances where users have explicitly disabled Spectre mitigations. Note: Spectre mitigations are currently enabled for all users by default settings.. This vulnerability affects Thunderbird 60.6 Firefox ESR 60.6 and Firefox 66.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Reference

https://access.redhat.com/errata/RHSA-2019:0966 https://access.redhat.com/errata/RHSA-2019:1144 https://bugzilla.mozilla.org/show_bug.cgi?id=1528829 https://www.mozilla.org/security/advisories/mfsa2019-07/ https://www.mozilla.org/security/advisories/mfsa2019-08/ https://www.mozilla.org/security/advisories/mfsa2019-11/

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

HIGH

Base Score

NONE

Base Severity

5.9