{"schemaVersion":3,"id":"MGASA-2017-0444","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"Updated tor packages fix security vulnerability\n\nWhen checking for replays in the INTRODUCE1 cell data for a (legacy) onion\nservice, Tor didn't correctly detect replays in the RSA- encrypted part of\nthe cell. It was previously checking for replays on the entire cell, but\nthose can be circumvented due to the malleability of Tor's legacy hybrid\nencryption. This can lead to a traffic confirmation attack (CVE-2017-8819).\n\nDenial of service issue where an attacker could crash a directory authority\nusing a malformed router descriptor (CVE-2017-8820).\n\nDenial of service bug where an attacker could use a malformed directory\nobject to cause a Tor instance to pause while OpenSSL would try to read a\npassphrase from the terminal (CVE-2017-8821).\n\nWhen running as a relay, Tor could build a path through itself, especially\nwhen it lost the version of its descriptor appearing in the consensus. When\nrunning as a relay, it could also choose itself as a guard (CVE-2017-8822).\n\nUse-after-free error that could crash v2 Tor onion services when they failed\nto open circuits while expiring introduction points (CVE-2017-8823).","dates":{"published":"2017-12-07T20:54:25.000Z","modified":"2026-04-16T06:24:57.646Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"mageia","product":"tor","name":"tor","label":"tor","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/tor","purlType":"rpm","versions":[{"text":"< 0.2.8.17-1.mga5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.2.8.17-1.mga5","eol":null,"hubHref":null},{"vendor":"mageia","product":"tor","name":"tor","label":"tor","ecosystem":"Mageia","cpePart":null,"purl":"pkg:rpm/mageia/tor","purlType":"rpm","versions":[{"text":"< 0.2.9.14-1.mga6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0.2.9.14-1.mga6","eol":null,"hubHref":null}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://advisories.mageia.org/MGASA-2017-0444.html","label":"advisories.mageia.org/MGASA-2017-0444.html","hostname":"advisories.mageia.org","tags":["Advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=22108","label":"bugs.mageia.org/show_bug.cgi?id=22108","hostname":"bugs.mageia.org","tags":["REPORT"]},{"url":"https://blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516","label":"blog.torproject.org/new-stable-tor-releases-security-fixes-0319-03013-02914-02817-02516","hostname":"blog.torproject.org","tags":["WEB"]}],"lineage":{"upstream":["CVE-2017-8819","CVE-2017-8820","CVE-2017-8821","CVE-2017-8822","CVE-2017-8823"],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2017-12-07T20:54:25.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-04-16T06:24:57.646Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T20:39:07.459Z","stale":false,"partial":false}}