CVE-2019-9793 - Mozilla: Improper bounds checks when Spectre mitigations are disabled

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MEDIUM

Mozilla: Improper bounds checks when Spectre mitigations are disabled

Published Apr 26, 2019

5.9

MEDIUM

CVSS 3.0

EPSS 1.63%

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.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <66
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <60.6
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <60.6

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mozilla

Firefox

n/a

Version	Status	Constraints
unspecified	affected	<66

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<60.6

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<60.6

Red Hat Enterprise Linux 6

firefox-0:60.6.0-3.el6_10

Fixed · RHSA-2019:0623
Red Hat Enterprise Linux 6

thunderbird-0:60.6.1-1.el6_10

Fixed · RHSA-2019:0680
Red Hat Enterprise Linux 7

firefox-0:60.6.0-3.el7_6

Fixed · RHSA-2019:0622
Red Hat Enterprise Linux 7

thunderbird-0:60.6.1-1.el7_6

Fixed · RHSA-2019:0681
Red Hat Enterprise Linux 8

firefox-0:60.6.1-1.el8

Fixed · RHSA-2019:0966
Red Hat Enterprise Linux 8

thunderbird-0:60.6.1-1.el8

Fixed · RHSA-2019:1144

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox-0:60.6.0-3.el6_10	Fixed	RHSA-2019:0623
Red Hat Enterprise Linux 6	thunderbird-0:60.6.1-1.el6_10	Fixed	RHSA-2019:0680
Red Hat Enterprise Linux 7	firefox-0:60.6.0-3.el7_6	Fixed	RHSA-2019:0622
Red Hat Enterprise Linux 7	thunderbird-0:60.6.1-1.el7_6	Fixed	RHSA-2019:0681
Red Hat Enterprise Linux 8	firefox-0:60.6.1-1.el8	Fixed	RHSA-2019:0966
Red Hat Enterprise Linux 8	thunderbird-0:60.6.1-1.el8	Fixed	RHSA-2019:1144

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-119

Buffer Overflow

References (11)

https://access.redhat.com/errata/RHSA-2019:0966
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:1144
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2019-9793
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1528829
x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1690678
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2019-9793
https://www.cve.org/CVERecord?id=CVE-2019-9793
https://www.mozilla.org/en-US/security/advisories/mfsa2019-08/#CVE-2019-9793
https://www.mozilla.org/security/advisories/mfsa2019-07/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-08/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-11/
x_refsource_MISCVendor Advisory

Link	Providers	Tags
https://access.redhat.com/errata/RHSA-2019:0966		vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2019:1144		vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2019-9793		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1528829		x_refsource_MISCIssue TrackingPermissions RequiredVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1690678		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2019-9793
https://www.cve.org/CVERecord?id=CVE-2019-9793
https://www.mozilla.org/en-US/security/advisories/mfsa2019-08/#CVE-2019-9793
https://www.mozilla.org/security/advisories/mfsa2019-07/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-08/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-11/		x_refsource_MISCVendor Advisory