PT-2020-22811 · Tor · Tor
Published
2020-12-03
·
Updated
2020-12-03
None
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Name of the Vulnerable Software and Affected Versions
tor versions prior to 0.3.5.12
Description
The issue concerns the Tor link protocol, where channels using obsolete versions were allowed to circumvent address-canonicity checks. This has been fixed by updating the tor package to version 0.3.5.12, which also addresses other bugs. Relays now thoroughly check for matching pending circuits before attaching them, including verifying address correctness and Ed25519 identities.
Recommendations
For versions prior to 0.3.5.12, update the tor package to version 0.3.5.12 to fix the issues. As a temporary workaround, consider restricting the use of obsolete Tor link protocol versions to minimize the risk of exploitation.
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Related Identifiers
Affected Products
Tor