CVE-2021-38493
Published: 8 September 2021
Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.14, Thunderbird < 78.14, and Firefox < 92.
Notes
| Author | Note |
|---|---|
| tyhicks | mozjs contains a copy of the SpiderMonkey JavaScript engine |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
firefox Launchpad, Ubuntu, Debian |
bionic |
Released
(92.0+build3-0ubuntu0.18.04.1)
|
| focal |
Released
(92.0+build3-0ubuntu0.20.04.1)
|
|
| hirsute |
Released
(92.0+build3-0ubuntu0.21.04.1)
|
|
| impish |
Released
(92.0+build3-0ubuntu1)
|
|
| jammy |
Released
(92.0+build3-0ubuntu1)
|
|
| kinetic |
Released
(92.0+build3-0ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(92)
|
|
| xenial |
Needed
|
|
|
firefox-esr Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(78.14.0esr-1)
|
|
| xenial |
Ignored
(out of standard support)
|
|
|
mozjs38 Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Does not exist
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
|
mozjs52 Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Needs triage
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
|
mozjs68 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Needs triage
|
|
| hirsute |
Does not exist
|
|
| impish |
Does not exist
|
|
| jammy |
Does not exist
|
|
| kinetic |
Does not exist
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
|
mozjs78 Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| focal |
Does not exist
|
|
| hirsute |
Ignored
(reached end-of-life)
|
|
| impish |
Ignored
(reached end-of-life)
|
|
| jammy |
Needs triage
|
|
| kinetic |
Needs triage
|
|
| trusty |
Does not exist
|
|
| upstream |
Needs triage
|
|
| xenial |
Does not exist
|
|
|
thunderbird Launchpad, Ubuntu, Debian |
bionic |
Released
(1:78.14.0+build1-0ubuntu0.18.04.1)
|
| focal |
Released
(1:78.14.0+build1-0ubuntu0.20.04.1)
|
|
| hirsute |
Released
(1:78.14.0+build1-0ubuntu0.21.04.1)
|
|
| impish |
Not vulnerable
(1:91.1.2+build1-0ubuntu1)
|
|
| jammy |
Not vulnerable
(1:91.1.2+build1-0ubuntu1)
|
|
| kinetic |
Not vulnerable
(1:91.1.2+build1-0ubuntu1)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(78.14)
|
|
| xenial |
Needed
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.8 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38493
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-42/#CVE-2021-38493
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-39/#CVE-2021-38493
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-38/#CVE-2021-38493
- https://access.redhat.com/security/cve/CVE-2021-38493
- https://ubuntu.com/security/notices/USN-5074-1
- https://ubuntu.com/security/notices/USN-5146-1
- NVD
- Launchpad
- Debian