{"id":"USN-5090-4","summary":"apache2 regression","details":"USN-5090-1 fixed vulnerabilities in Apache HTTP Server. One of the upstream\nfixes introduced a regression in UDS URIs. This update fixes the problem.\n\nOriginal advisory details:\n\n James Kettle discovered that the Apache HTTP Server HTTP/2 module\n incorrectly handled certain crafted methods. A remote attacker could\n possibly use this issue to perform request splitting or cache poisoning\n attacks. (CVE-2021-33193)\n \n It was discovered that the Apache HTTP Server incorrectly handled certain\n malformed requests. A remote attacker could possibly use this issue to\n cause the server to crash, resulting in a denial of service.\n (CVE-2021-34798)\n \n Li Zhi Xin discovered that the Apache mod_proxy_uwsgi module incorrectly\n handled certain request uri-paths. A remote attacker could possibly use\n this issue to cause the server to crash, resulting in a denial of service.\n This issue only affected Ubuntu 20.04 LTS and Ubuntu 21.04.\n (CVE-2021-36160)\n \n It was discovered that the Apache HTTP Server incorrectly handled escaping\n quotes. If the server was configured with third-party modules, a remote\n attacker could use this issue to cause the server to crash, resulting in a\n denial of service, or possibly execute arbitrary code. (CVE-2021-39275)\n \n It was discovered that the Apache mod_proxy module incorrectly handled\n certain request uri-paths. A remote attacker could possibly use this issue\n to cause the server to forward requests to arbitrary origin servers.\n (CVE-2021-40438)\n","modified":"2026-06-25T13:30:48.373726305Z","published":"2021-09-28T15:05:47Z","references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5090-4"},{"type":"REPORT","url":"https://launchpad.net/bugs/1945311"}],"affected":[{"package":{"name":"apache2","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/apache2?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.18-2ubuntu3.17+esm3"}]}],"versions":["2.4.12-2ubuntu2","2.4.17-1ubuntu1","2.4.17-2ubuntu1","2.4.17-3ubuntu1","2.4.18-1ubuntu1","2.4.18-2ubuntu1","2.4.18-2ubuntu2","2.4.18-2ubuntu3","2.4.18-2ubuntu3.1","2.4.18-2ubuntu3.2","2.4.18-2ubuntu3.3","2.4.18-2ubuntu3.4","2.4.18-2ubuntu3.5","2.4.18-2ubuntu3.7","2.4.18-2ubuntu3.8","2.4.18-2ubuntu3.9","2.4.18-2ubuntu3.10","2.4.18-2ubuntu3.12","2.4.18-2ubuntu3.13","2.4.18-2ubuntu3.14","2.4.18-2ubuntu3.15","2.4.18-2ubuntu3.17","2.4.18-2ubuntu3.17+esm1","2.4.18-2ubuntu3.17+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"apache2","binary_version":"2.4.18-2ubuntu3.17+esm3"},{"binary_name":"apache2-bin","binary_version":"2.4.18-2ubuntu3.17+esm3"},{"binary_name":"apache2-data","binary_version":"2.4.18-2ubuntu3.17+esm3"},{"binary_name":"apache2-suexec-custom","binary_version":"2.4.18-2ubuntu3.17+esm3"},{"binary_name":"apache2-suexec-pristine","binary_version":"2.4.18-2ubuntu3.17+esm3"},{"binary_name":"apache2-utils","binary_version":"2.4.18-2ubuntu3.17+esm3"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[],"ecosystem":"Ubuntu:Pro:16.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5090-4.json"}}],"schema_version":"1.7.5"}