{"id":"USN-5036-1","summary":"tor vulnerabilities","details":"It was discovered that Tor incorrectly handled certain memory operations. A\nremote attacker could use this issue to cause a denial of service. This issue\nonly affected Ubuntu 18.04 ESM. (CVE-2019-8955)\n\nIt was discovered that Tor did not properly handle the input length to\ndump_desc() function. A remote attacker could use this issue to cause a denial\nof service. This issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and\nUbuntu 20.04 ESM. (CVE-2021-28089)\n\nIt was discovered that Tor did not properly sanitize the relay nickname in\ndirvote_add_signatures_to_pending_consensus() function. An attacker could\npossibly use this issue to cause an assertion failure and then cause a denial\nof service. (CVE-2021-28090)\n\nIt was discovered that Tor did not properly validate the layer hint on\nhalf-open streams. A remote attacker could possibly use this issue to bypass\nthe access control, leading to remote code execution. This issue only affected\nUbuntu 20.04 ESM. (CVE-2021-34548)\n\nIt was discovered that Tor was using an insecure hash function. A remote\nattacker could use this issue to cause a denial of service. This issue only\naffected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM.\n(CVE-2021-34549)\n\nIt was discovered that Tor did not properly manage memory under certain\ncircumstances. If a user were tricked into opening a specially crafted request,\na remote attacker could possibly use this issue to cause a crash, resulting in\na denial of service, or possibly reading sensitive data. This issue only\naffected Ubuntu 18.04 ESM and Ubuntu 20.04 ESM. (CVE-2021-34550)\n\nIt was discovered that Tor mishandles the relationship between batch-signature\nverification and single-signature verification. An attacker could possibly use\nthis issue to cause an assertion failure and then cause a denial of service.\nThis issue only affected Ubuntu 16.04 ESM, Ubuntu 18.04 ESM and Ubuntu 20.04\nESM. (CVE-2021-38385)\n","modified":"2026-06-29T13:48:07.506826782Z","published":"2022-10-04T11:04:57Z","related":["UBUNTU-CVE-2019-8955","UBUNTU-CVE-2021-28089","UBUNTU-CVE-2021-28090","UBUNTU-CVE-2021-34548","UBUNTU-CVE-2021-34549","UBUNTU-CVE-2021-34550","UBUNTU-CVE-2021-38385"],"upstream":["CVE-2019-8955","CVE-2021-28089","CVE-2021-28090","CVE-2021-34548","CVE-2021-34549","CVE-2021-34550","CVE-2021-38385","UBUNTU-CVE-2019-8955","UBUNTU-CVE-2021-28089","UBUNTU-CVE-2021-28090","UBUNTU-CVE-2021-34548","UBUNTU-CVE-2021-34549","UBUNTU-CVE-2021-34550","UBUNTU-CVE-2021-38385"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5036-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-8955"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-28089"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-28090"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-34548"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-34549"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-34550"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-38385"}],"affected":[{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=trusty%2Fesm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.4.27-1ubuntu0.1+esm2"}]}],"versions":["0.2.3.25-1","0.2.4.19-1","0.2.4.20-1","0.2.4.27-1build0.14.04.1","0.2.4.27-1ubuntu0.1","0.2.4.27-1ubuntu0.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.2.4.27-1ubuntu0.1+esm2"},{"binary_version":"0.2.4.27-1ubuntu0.1+esm2","binary_name":"tor-geoipdb"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-28090"}],"ecosystem":"Ubuntu:Pro:14.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5036-1.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.2.9.14-1ubuntu1~16.04.3+esm1"}]}],"versions":["0.2.6.10-1ubuntu2","0.2.7.6-1ubuntu1","0.2.9.11-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.1","0.2.9.14-1ubuntu1~16.04.2","0.2.9.14-1ubuntu1~16.04.3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1","binary_name":"tor"},{"binary_version":"0.2.9.14-1ubuntu1~16.04.3+esm1","binary_name":"tor-geoipdb"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-28089"},{"id":"CVE-2021-28090","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-34549"},{"id":"CVE-2021-38385","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5036-1.json"}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.2.10-1ubuntu0.2~esm2"}]}],"versions":["0.3.0.10-1","0.3.1.8-2","0.3.1.9-1","0.3.2.9-1","0.3.2.9-1build1","0.3.2.10-1","0.3.2.10-1ubuntu0.1","0.3.2.10-1ubuntu0.2~esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"tor","binary_version":"0.3.2.10-1ubuntu0.2~esm2"},{"binary_name":"tor-geoipdb","binary_version":"0.3.2.10-1ubuntu0.2~esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5036-1.json","cves_map":{"cves":[{"id":"CVE-2021-28089","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2021-28090","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-34549"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-34550"},{"id":"CVE-2021-38385","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"}}},{"package":{"name":"tor","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4.2.7-1ubuntu0.1~esm1"}]}],"versions":["0.4.1.5-1","0.4.1.5-1build1","0.4.1.6-1","0.4.2.5-1","0.4.2.6-1","0.4.2.7-1"],"ecosystem_specific":{"binaries":[{"binary_name":"tor","binary_version":"0.4.2.7-1ubuntu0.1~esm1"},{"binary_name":"tor-geoipdb","binary_version":"0.4.2.7-1ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-28089"},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-28090"},{"id":"CVE-2021-34548","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2021-34549"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2021-34550"},{"id":"CVE-2021-38385","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5036-1.json"}}],"schema_version":"1.7.5"}