Vulnerability Details : CVE-2021-45884
Potential exploit
In Brave Desktop 1.17 through 1.33 before 1.33.106, when CNAME-based adblocking and a proxying extension with a SOCKS fallback are enabled, additional DNS requests are issued outside of the proxying extension using the system's DNS settings, resulting in information disclosure. NOTE: this issue exists because of an incomplete fix for CVE-2021-21323 and CVE-2021-22916.
Vulnerability category: Information leak
Products affected by CVE-2021-45884
- cpe:2.3:a:brave:brave:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-45884
0.32%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 52 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-45884
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:N/A:N |
8.6
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-45884
-
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-45884
-
https://github.com/brave/brave-core/pull/10742
Disable CNAME uncloaking when a proxy extension with a socks fallback is enabled by antonok-edm · Pull Request #10742 · brave/brave-core · GitHubPatch;Third Party Advisory
-
https://hackerone.com/reports/1377864
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https://github.com/brave/brave-browser/issues/20079
[Desktop] Release notes for `1.33.x - Release` · Issue #20079 · brave/brave-browser · GitHubIssue Tracking;Release Notes;Third Party Advisory
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https://github.com/brave/brave-browser/issues/19070
hackerone #1377864 - CNAME Uncloacking in SOCKS5 protocol · Issue #19070 · brave/brave-browser · GitHubExploit;Issue Tracking;Patch;Third Party Advisory
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