CVE-2017-0377

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.48%
Vendor Advisory torproject.org Vendor Advisory torproject.org Vendor Advisory torproject.org
Affected: n/a Tor
Published at:
Updated at:

References

Link Tags
https://trac.torproject.org/projects/tor/ticket/22753 issue tracking vendor advisory
https://security-tracker.debian.org/CVE-2017-0377 third party advisory
https://blog.torproject.org/blog/tor-0309-released-security-update-clients release notes vendor advisory
https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients release notes vendor advisory
https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2017-0377?
CVE-2017-0377 has been scored as a high severity vulnerability.
How to fix CVE-2017-0377?
To fix CVE-2017-0377, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-0377 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2017-0377 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-0377?
CVE-2017-0377 affects n/a Tor.
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