CVE-2017-5384

low-risk
Published 2018-06-11

Proxy Auto-Config (PAC) files can specify a JavaScript function called for all URL requests with the full URL path which exposes more information than would be sent to the proxy itself in the case of HTTPS. Normally the Proxy Auto-Config file is specified by the user or machine owner and presumed to be non-malicious, but if a user has enabled Web Proxy Auto Detect (WPAD) this file can be served remotely. This vulnerability affects Firefox < 51.

Do I need to act?

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0.76% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.9/10 Medium
NETWORK / HIGH complexity

Affected Products (1)

Affected Vendors

Mozilla

References (10)

Third Party Advisory http://www.securityfocus.com/bid/95763
Third Party Advisory http://www.securitytracker.com/id/1037693
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1255474
Exploit https://www.contextis.com//resources/blog/leaking-https-urls-20-year-old-vulnera...
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-01/
Third Party Advisory http://www.securityfocus.com/bid/95763
Third Party Advisory http://www.securitytracker.com/id/1037693
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1255474
Exploit https://www.contextis.com//resources/blog/leaking-https-urls-20-year-old-vulnera...
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2017-01/
26
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 3/34 · Minimal
Exposure 5/34 · Minimal