Vulnerability · Published Nov 3, 2021 · Assigned by mozilla
CVE-2021-38492
Medium 6.5
In plain English
A medium-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 67% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. *This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92, Thunderbird < 91.1, Thunderbird < 78.14, Firefox ESR < 78.14, and Firefox ESR < 91.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.21 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.22 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.23 | firefox | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.20 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.21 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.22 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.23 | firefox-esr | 91.2.0-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.21 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.22 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.23 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.24 | librewolf | 92.0.1-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38492 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-38492 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-38492 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | unspecified – before 92 |
| Mozilla | Thunderbird | unspecified – before 91.1unspecified – before 78.14 |
| Mozilla | Firefox ESR | unspecified – before 78.14unspecified – before 91.1 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-40/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-41/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-38/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-42/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-39/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1721107 x_refsource_MISC
- GLSA-202208-14 vendor-advisory, x_refsource_GENTOO