CVE-2017-0377

moderate-risk
Published 2017-07-02

Tor 0.3.x before 0.3.0.9 has a guard-selection algorithm that only considers the exit relay (not the exit relay's family), which might allow remote attackers to defeat intended anonymity properties by leveraging the existence of large families.

Do I need to act?

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0.48% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (8)

Tor
Tor
Tor
Tor
Tor
Tor
Tor
Tor

Affected Vendors

Torproject

References (10)

Release Notes https://blog.torproject.org/blog/tor-0309-released-security-update-clients
Release Notes https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients
Patch https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c054802735...
Third Party Advisory https://security-tracker.debian.org/CVE-2017-0377
Issue Tracking https://trac.torproject.org/projects/tor/ticket/22753
Release Notes https://blog.torproject.org/blog/tor-0309-released-security-update-clients
Release Notes https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients
Patch https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c054802735...
Third Party Advisory https://security-tracker.debian.org/CVE-2017-0377
Issue Tracking https://trac.torproject.org/projects/tor/ticket/22753
42
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 2/34 · Minimal
Exposure 14/34 · Moderate