Medium severity · published Jan 7, 2021
CVE-2020-35111
When an extension with the proxy permission registered to receive <all_urls>, the proxy.onRequest callback was not triggered for view-source URLs
4.3
CVSS
1.4%
EPSS
No
On KEV
Description
When an extension with the proxy permission registered to receive <all_urls>, the proxy.onRequest callback was not triggered for view-source URLs. While web content cannot navigate to such URLs, a user opening View Source could have inadvertently leaked their IP address. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.4% · higher than 73% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 84.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.6.0 · source: NVD
TH
Thunderbird · Mozilla
before 78.6.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-35111
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-35111
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1657916
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-54/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-55/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-56/
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