Information disclosure in Torproject Tor
CVE-2017-0377
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.024 (83.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000
Affected products
- Torproject Tor — versions 0.3.0.1, 0.3.0.2, 0.3.0.3
- Tor — versions Tor
Weakness classification (CWE)
References
- trac.torproject.org/projects/tor/ticket/22753 (Issue Tracking, Vendor Advisory)
- security-tracker.debian.org/CVE-2017-0377 (Third Party Advisory)
- blog.torproject.org/blog/tor-0309-released-security-update-clients (Release Notes, Vendor Advisory)
- blog.torproject.org/blog/tor-0314-alpha-released-security-update-clients (Release Notes, Vendor Advisory)
- github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2017-0377?
- CVE-2017-0377 is a high-severity vulnerability in Torproject Tor, classified under Information Disclosure. CVSS score: 7.5/10. Published 2017-07-02.
- How severe is CVE-2017-0377?
- High severity. CVSS v3 base score is 7.5 out of 10.