{"id":"USN-4113-2","aliases":[],"status":"published","title":"apache2 regression","description":"USN-4113-1 fixed vulnerabilities in the Apache HTTP server.\nUnfortunately, that update introduced a regression when proxying\nbalancer manager connections in some configurations. This update\nfixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Stefan Eissing discovered that the HTTP/2 implementation in Apache\n did not properly handle upgrade requests from HTTP/1.1 to HTTP/2 in\n some situations. A remote attacker could use this to cause a denial\n of service (daemon crash). This issue only affected Ubuntu 18.04 LTS\n and Ubuntu 19.04. (CVE-2019-0197)\n\n Craig Young discovered that a memory overwrite error existed in\n Apache when performing HTTP/2 very early pushes in some situations. A\n remote attacker could use this to cause a denial of service (daemon\n crash). This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04.\n (CVE-2019-10081)\n\n Craig Young discovered that a read-after-free error existed in the\n HTTP/2 implementation in Apache during connection shutdown. A remote\n attacker could use this to possibly cause a denial of service (daemon\n crash) or possibly expose sensitive information. This issue only\n affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-10082)\n\n Matei Badanoiu discovered that the mod_proxy component of\n Apache did not properly filter URLs when reporting errors in some\n configurations. A remote attacker could possibly use this issue to\n conduct cross-site scripting (XSS) attacks. (CVE-2019-10092)\n\n Daniel McCarney discovered that mod_remoteip component of Apache\n contained a stack buffer overflow when parsing headers from a trusted\n intermediary proxy in some situations. A remote attacker controlling a\n trusted proxy could use this to cause a denial of service or possibly\n execute arbitrary code. This issue only affected Ubuntu 19.04.\n (CVE-2019-10097)\n\n Yukitsugu Sasaki discovered that the mod_rewrite component in Apache\n was vulnerable to open redirects in some situations. A remote attacker\n could use this to possibly expose sensitive information or bypass\n intended restrictions. (CVE-2019-10098)\n\n Jonathan Looney discovered that the HTTP/2 implementation in Apache did\n not properly limit the amount of buffering for client connections in\n some situations. A remote attacker could use this to cause a denial\n of service (unresponsive daemon). This issue only affected Ubuntu\n 18.04 LTS and Ubuntu 19.04. (CVE-2019-9517)","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2019-09-17T12:24:05Z","modified":"2026-04-22T09:59:25Z","fixes":[{"ecosystem":"Ubuntu:16.04:LTS","package":"apache2","fixed_in":["2.4.18-2ubuntu3.13"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"apache2","fixed_in":["2.4.29-1ubuntu4.11"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.18-2ubuntu3.13"}]}],"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"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.29-1ubuntu4.11"}]}],"versions":["2.4.27-2ubuntu3","2.4.29-1ubuntu1","2.4.29-1ubuntu2","2.4.29-1ubuntu3","2.4.29-1ubuntu4","2.4.29-1ubuntu4.1","2.4.29-1ubuntu4.2","2.4.29-1ubuntu4.3","2.4.29-1ubuntu4.4","2.4.29-1ubuntu4.5","2.4.29-1ubuntu4.6","2.4.29-1ubuntu4.7","2.4.29-1ubuntu4.8","2.4.29-1ubuntu4.10"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-4113-2","tags":["advisory"]},{"url":"https://launchpad.net/bugs/1842701","tags":["report"]}],"sources":{"osv":[{"id":"USN-4113-2","title":"apache2 regression","description":"USN-4113-1 fixed vulnerabilities in the Apache HTTP server.\nUnfortunately, that update introduced a regression when proxying\nbalancer manager connections in some configurations. This update\nfixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Stefan Eissing discovered that the HTTP/2 implementation in Apache\n did not properly handle upgrade requests from HTTP/1.1 to HTTP/2 in\n some situations. A remote attacker could use this to cause a denial\n of service (daemon crash). This issue only affected Ubuntu 18.04 LTS\n and Ubuntu 19.04. (CVE-2019-0197)\n\n Craig Young discovered that a memory overwrite error existed in\n Apache when performing HTTP/2 very early pushes in some situations. A\n remote attacker could use this to cause a denial of service (daemon\n crash). This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.04.\n (CVE-2019-10081)\n\n Craig Young discovered that a read-after-free error existed in the\n HTTP/2 implementation in Apache during connection shutdown. A remote\n attacker could use this to possibly cause a denial of service (daemon\n crash) or possibly expose sensitive information. This issue only\n affected Ubuntu 18.04 LTS and Ubuntu 19.04. (CVE-2019-10082)\n\n Matei Badanoiu discovered that the mod_proxy component of\n Apache did not properly filter URLs when reporting errors in some\n configurations. A remote attacker could possibly use this issue to\n conduct cross-site scripting (XSS) attacks. (CVE-2019-10092)\n\n Daniel McCarney discovered that mod_remoteip component of Apache\n contained a stack buffer overflow when parsing headers from a trusted\n intermediary proxy in some situations. A remote attacker controlling a\n trusted proxy could use this to cause a denial of service or possibly\n execute arbitrary code. This issue only affected Ubuntu 19.04.\n (CVE-2019-10097)\n\n Yukitsugu Sasaki discovered that the mod_rewrite component in Apache\n was vulnerable to open redirects in some situations. A remote attacker\n could use this to possibly expose sensitive information or bypass\n intended restrictions. (CVE-2019-10098)\n\n Jonathan Looney discovered that the HTTP/2 implementation in Apache did\n not properly limit the amount of buffering for client connections in\n some situations. A remote attacker could use this to cause a denial\n of service (unresponsive daemon). This issue only affected Ubuntu\n 18.04 LTS and Ubuntu 19.04. (CVE-2019-9517)\n","status":"published","published":"2019-09-17T12:24:05Z","modified":"2026-04-22T09:59:25.831807Z","updated_at":"2026-11-02T16:58:14.019824Z"}]}}