{"id":"UBUNTU-CVE-2020-9484","details":"When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if a) an attacker is able to control the contents and name of a file on the server; and b) the server is configured to use the PersistenceManager with a FileStore; and c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter=\"null\" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control. Note that all of conditions a) to d) must be true for the attack to succeed.","modified":"2026-01-30T02:10:52.772715Z","published":"2020-05-20T19:15:00Z","related":["USN-4448-1","USN-4596-1","USN-5360-1","USN-6908-1","USN-6943-1"],"upstream":["CVE-2020-9484"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-9484"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/bb33048e3f9b4f2b70e4da2e6c4e34ca89023b1b"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/3aa8f28db7efb311cdd1b6fe15a9cd3b167a2222"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/ec08af18d0f9ddca3f2d800ef66fe7fd20afef2f"},{"type":"REPORT","url":"https://github.com/apache/tomcat/commit/53e30390943c18fca0c9e57dbcc14f1c623cfd06"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1%40%3Cannounce.tomcat.apache.org%3E"},{"type":"REPORT","url":"https://lists.apache.org/thread.html/rf70f53af27e04869bdac18b1fc14a3ee529e59eb12292c8791a77926@%3Cusers.tomcat.apache.org%3E"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4448-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4596-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5360-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-9484"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6908-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6943-1"}],"affected":[{"package":{"name":"tomcat7","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tomcat7@7.0.52-1ubuntu0.16+esm1?arch=source&distro=trusty/esm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.52-1ubuntu0.16+esm1"}]}],"versions":["7.0.42-1","7.0.47-1","7.0.50-1","7.0.52-1","7.0.52-1ubuntu0.1","7.0.52-1ubuntu0.3","7.0.52-1ubuntu0.6","7.0.52-1ubuntu0.7","7.0.52-1ubuntu0.8","7.0.52-1ubuntu0.9","7.0.52-1ubuntu0.10","7.0.52-1ubuntu0.11","7.0.52-1ubuntu0.13","7.0.52-1ubuntu0.14","7.0.52-1ubuntu0.15","7.0.52-1ubuntu0.16"],"ecosystem_specific":{"binaries":[{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"libservlet3.0-java"},{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"libtomcat7-java"},{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"tomcat7"},{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"tomcat7-admin"},{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"tomcat7-common"},{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"tomcat7-docs"},{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"tomcat7-examples"},{"binary_version":"7.0.52-1ubuntu0.16+esm1","binary_name":"tomcat7-user"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-9484.json"}},{"package":{"name":"tomcat8","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/tomcat8@8.0.32-1ubuntu1.13?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.0.32-1ubuntu1.13"}]}],"versions":["8.0.26-1","8.0.28-1","8.0.30-1","8.0.32-1","8.0.32-1ubuntu1","8.0.32-1ubuntu1.1","8.0.32-1ubuntu1.2","8.0.32-1ubuntu1.3","8.0.32-1ubuntu1.4","8.0.32-1ubuntu1.5","8.0.32-1ubuntu1.6","8.0.32-1ubuntu1.7","8.0.32-1ubuntu1.8","8.0.32-1ubuntu1.9","8.0.32-1ubuntu1.10","8.0.32-1ubuntu1.11"],"ecosystem_specific":{"binaries":[{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"libservlet3.1-java"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"libtomcat8-java"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-admin"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-common"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-docs"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-examples"},{"binary_version":"8.0.32-1ubuntu1.13","binary_name":"tomcat8-user"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-9484.json"}},{"package":{"name":"tomcat7","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tomcat7@7.0.68-1ubuntu0.4+esm2?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.68-1ubuntu0.4+esm2"}]}],"versions":["7.0.64-1","7.0.68-1","7.0.68-1ubuntu0.1","7.0.68-1ubuntu0.3","7.0.68-1ubuntu0.4","7.0.68-1ubuntu0.4+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"libservlet3.0-java"},{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"libtomcat7-java"},{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"tomcat7"},{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"tomcat7-admin"},{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"tomcat7-common"},{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"tomcat7-docs"},{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"tomcat7-examples"},{"binary_version":"7.0.68-1ubuntu0.4+esm2","binary_name":"tomcat7-user"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-9484.json"}},{"package":{"name":"tomcat9","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/tomcat9@9.0.16-3ubuntu0.18.04.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.16-3ubuntu0.18.04.2"}]}],"versions":["9.0.16-3~18.04.1","9.0.16-3ubuntu0.18.04.1"],"ecosystem_specific":{"binaries":[{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"libtomcat9-embed-java"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"libtomcat9-java"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9-admin"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9-common"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9-docs"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9-examples"},{"binary_version":"9.0.16-3ubuntu0.18.04.2","binary_name":"tomcat9-user"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-9484.json"}},{"package":{"name":"tomcat7","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tomcat7@7.0.78-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7.0.78-1ubuntu0.1~esm1"}]}],"versions":["7.0.78-1"],"ecosystem_specific":{"binaries":[{"binary_version":"7.0.78-1ubuntu0.1~esm1","binary_name":"libservlet3.0-java"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-9484.json"}},{"package":{"name":"tomcat8","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tomcat8@8.5.39-1ubuntu1~18.04.3+esm2?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.5.39-1ubuntu1~18.04.3+esm2"}]}],"versions":["8.5.21-1ubuntu1","8.5.29-1","8.5.30-1","8.5.30-1ubuntu1","8.5.30-1ubuntu1.2","8.5.30-1ubuntu1.3","8.5.30-1ubuntu1.4","8.5.39-1ubuntu1~18.04.1","8.5.39-1ubuntu1~18.04.2","8.5.39-1ubuntu1~18.04.3","8.5.39-1ubuntu1~18.04.3+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"libtomcat8-embed-java"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"libtomcat8-java"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"tomcat8"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"tomcat8-admin"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"tomcat8-common"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"tomcat8-docs"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"tomcat8-examples"},{"binary_version":"8.5.39-1ubuntu1~18.04.3+esm2","binary_name":"tomcat8-user"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-9484.json"}},{"package":{"name":"tomcat9","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/tomcat9@9.0.31-1ubuntu0.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.0.31-1ubuntu0.1"}]}],"versions":["9.0.24-1","9.0.27-1","9.0.31-1"],"ecosystem_specific":{"binaries":[{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"libtomcat9-embed-java"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"libtomcat9-java"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"tomcat9"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"tomcat9-admin"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"tomcat9-common"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"tomcat9-docs"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"tomcat9-examples"},{"binary_version":"9.0.31-1ubuntu0.1","binary_name":"tomcat9-user"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-9484.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"low"}]}