CVE-2020-35111 — Sensitive Information Exposure in Mozilla Firefox

CWE-200 — Sensitive Information Exposure12 documents8 sources
Severity
4.3MEDIUMNVD
OSV6.5
EPSS
0.3%
top 45.12%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Mozilla FirefoxMozilla Firefox ESRMozilla Thunderbird
Timeline
PublishedJan 7
Latest updateMay 24

Description

When an extension with the proxy permission registered to receive , 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:NExploitability: 2.8 | Impact: 1.4

Affected Packages8 packages

▶CVEListV5mozilla/firefoxunspecified — 84
▶NVDmozilla/firefox< 84.0
▶CVEListV5mozilla/firefox_esrunspecified — 78.6
▶NVDmozilla/firefox_esr< 78.6.0
▶Ubuntumozilla/firefox< 84.0+build3-0ubuntu0.16.04.1+2

🔴Vulnerability Details

4
GHSA
GHSA-ww34-37gv-7gf7: When an extension with the proxy permission registered to receive , the proxy↗2022-05-24
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OSV
CVE-2020-35111: When an extension with the proxy permission registered to receive , the proxy↗2021-01-07
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CVEList
CVE-2020-35111: When an extension with the proxy permission registered to receive , the proxy↗2021-01-07
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OSV
firefox vulnerabilities↗2020-12-15
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📋Vendor Advisories

7
Ubuntu
Thunderbird vulnerabilities↗2021-01-20
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Red Hat
Mozilla: The proxy.onRequest API did not catch view-source URLs↗2020-12-15
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Ubuntu
Firefox vulnerabilities↗2020-12-15
▶
Debian
CVE-2020-35111: firefox - When an extension with the proxy permission registered to receive <all_urls>, th...↗2020
▶
Mozilla
Mozilla Foundation Security Advisory 2020-55: CVE-2020-35111↗
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CVE-2020-35111 — Sensitive Information Exposure | cvebase