VulnerabilityModified
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.
HIGH 7.5EPSS 2.45%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 2.45% probability · 83th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- torproject/tor
- Source
- security@debian.org
References
- https://blog.torproject.org/blog/tor-0309-released-security-update-clientsRelease Notes, Vendor Advisory
- https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clientsRelease Notes, Vendor Advisory
- https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350Patch, Third Party Advisory
- https://security-tracker.debian.org/CVE-2017-0377Third Party Advisory
- https://trac.torproject.org/projects/tor/ticket/22753Issue Tracking, Vendor Advisory
- https://blog.torproject.org/blog/tor-0309-released-security-update-clientsRelease Notes, Vendor Advisory
- https://blog.torproject.org/blog/tor-0314-alpha-released-security-update-clientsRelease Notes, Vendor Advisory
- https://github.com/torproject/tor/commit/665baf5ed5c6186d973c46cdea165c0548027350Patch, Third Party Advisory
- https://security-tracker.debian.org/CVE-2017-0377Third Party Advisory
- https://trac.torproject.org/projects/tor/ticket/22753Issue Tracking, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.