CVE-2020-6820 - Mozilla: Use-after-free when handling a ReadableStream

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HIGH KEV

Mozilla: Use-after-free when handling a ReadableStream

Published Apr 24, 2020 ·Due May 3, 2022

8.8

HIGH

CVSS 3.1

EPSS 7.06%

Description

Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <74.0.1
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <68.6.1
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <68.7.0

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	<74.0.1

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<68.6.1

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<68.7.0

Red Hat Enterprise Linux 6

firefox-0:68.6.1-1.el6_10

Fixed · RHSA-2020:1339
Red Hat Enterprise Linux 6

thunderbird-0:68.7.0-1.el6_10

Fixed · RHSA-2020:1488
Red Hat Enterprise Linux 7

firefox-0:68.6.1-1.el7_8

Fixed · RHSA-2020:1338
Red Hat Enterprise Linux 7

thunderbird-0:68.7.0-1.el7_8

Fixed · RHSA-2020:1489
Red Hat Enterprise Linux 8

firefox-0:68.6.1-1.el8_1

Fixed · RHSA-2020:1341
Red Hat Enterprise Linux 8

thunderbird-0:68.7.0-1.el8_1

Fixed · RHSA-2020:1495
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

firefox-0:68.6.1-1.el8_0

Fixed · RHSA-2020:1340
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

thunderbird-0:68.7.0-1.el8_0

Fixed · RHSA-2020:1496
Red Hat Enterprise Linux 5

firefox

Out of support scope
Red Hat Enterprise Linux 5

thunderbird

Out of support scope

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox-0:68.6.1-1.el6_10	Fixed	RHSA-2020:1339
Red Hat Enterprise Linux 6	thunderbird-0:68.7.0-1.el6_10	Fixed	RHSA-2020:1488
Red Hat Enterprise Linux 7	firefox-0:68.6.1-1.el7_8	Fixed	RHSA-2020:1338
Red Hat Enterprise Linux 7	thunderbird-0:68.7.0-1.el7_8	Fixed	RHSA-2020:1489
Red Hat Enterprise Linux 8	firefox-0:68.6.1-1.el8_1	Fixed	RHSA-2020:1341
Red Hat Enterprise Linux 8	thunderbird-0:68.7.0-1.el8_1	Fixed	RHSA-2020:1495
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions	firefox-0:68.6.1-1.el8_0	Fixed	RHSA-2020:1340
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions	thunderbird-0:68.7.0-1.el8_0	Fixed	RHSA-2020:1496
Red Hat Enterprise Linux 5	firefox	Out of support scope	n/a
Red Hat Enterprise Linux 5	thunderbird	Out of support scope	n/a

Remediation

No remediation recorded yet.

Weaknesses (2)

CWE-362

Race Condition

CWE-416

Use After Free

References (12)

https://access.redhat.com/security/cve/CVE-2020-6820
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
x_refsource_MISCIssue TrackingPermissions Required
https://bugzilla.redhat.com/show_bug.cgi?id=1820878
Issue Tracking
https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-27964
Advisory
https://nvd.nist.gov/vuln/detail/CVE-2020-6820
https://usn.ubuntu.com/4335-1/
vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820
government-resourceUS Government Resource
https://www.cve.org/CVERecord?id=CVE-2020-6820
https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/#CVE-2020-6820
https://www.mozilla.org/security/advisories/mfsa2020-11/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-14/
x_refsource_MISCVendor Advisory

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2020-6820		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1626728		x_refsource_MISCIssue TrackingPermissions Required
https://bugzilla.redhat.com/show_bug.cgi?id=1820878		Issue Tracking
https://euvd.enisa.europa.eu/vulnerability/EUVD-2020-27964		Advisory
https://nvd.nist.gov/vuln/detail/CVE-2020-6820
https://usn.ubuntu.com/4335-1/		vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820		government-resourceUS Government Resource
https://www.cve.org/CVERecord?id=CVE-2020-6820
https://www.mozilla.org/en-US/security/advisories/mfsa2020-11/#CVE-2020-6820
https://www.mozilla.org/security/advisories/mfsa2020-11/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-14/		x_refsource_MISCVendor Advisory