{"id":"USN-6885-2","aliases":[],"status":"published","title":"apache2 regression","description":"USN-6885-1 fixed vulnerabilities in Apache HTTP Server. One of the security\nfixes introduced a regression when proxying requests to a HTTP/2 server.\nThis update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Marc Stern discovered that the Apache HTTP Server incorrectly handled\n serving WebSocket protocol upgrades over HTTP/2 connections. A remote\n attacker could possibly use this issue to cause the server to crash,\n resulting in a denial of service. (CVE-2024-36387)\n \n Orange Tsai discovered that the Apache HTTP Server mod_proxy module\n incorrectly sent certain request URLs with incorrect encodings to backends.\n A remote attacker could possibly use this issue to bypass authentication.\n (CVE-2024-38473)\n \n Orange Tsai discovered that the Apache HTTP Server mod_rewrite module\n incorrectly handled certain substitutions. A remote attacker could possibly\n use this issue to execute scripts in directories not directly reachable\n by any URL, or cause a denial of service. Some environments may require\n using the new UnsafeAllow3F flag to handle unsafe substitutions.\n (CVE-2024-38474, CVE-2024-38475, CVE-2024-39573)\n \n Orange Tsai discovered that the Apache HTTP Server incorrectly handled\n certain response headers. A remote attacker could possibly use this issue\n to obtain sensitive information, execute local scripts, or perform SSRF\n attacks. (CVE-2024-38476)\n \n Orange Tsai discovered that the Apache HTTP Server mod_proxy module\n incorrectly handled certain requests. A remote attacker could possibly use\n this issue to cause the server to crash, resulting in a denial of service.\n (CVE-2024-38477)\n \n It was discovered that the Apache HTTP Server incorrectly handled certain\n handlers configured via AddType. A remote attacker could possibly use this\n issue to obtain source code. (CVE-2024-39884)","facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2024-07-11T17:25:58Z","modified":"2026-04-22T10:49:16Z","fixes":[{"ecosystem":"Ubuntu:20.04:LTS","package":"apache2","fixed_in":["2.4.41-4ubuntu3.20"],"sources":["osv"]},{"ecosystem":"Ubuntu:22.04:LTS","package":"apache2","fixed_in":["2.4.52-1ubuntu4.11"],"sources":["osv"]},{"ecosystem":"Ubuntu:24.04:LTS","package":"apache2","fixed_in":["2.4.58-1ubuntu8.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.41-4ubuntu3.20"}]}],"versions":["2.4.41-1ubuntu1","2.4.41-4ubuntu1","2.4.41-4ubuntu2","2.4.41-4ubuntu3","2.4.41-4ubuntu3.1","2.4.41-4ubuntu3.3","2.4.41-4ubuntu3.4","2.4.41-4ubuntu3.5","2.4.41-4ubuntu3.6","2.4.41-4ubuntu3.7","2.4.41-4ubuntu3.8","2.4.41-4ubuntu3.9","2.4.41-4ubuntu3.10","2.4.41-4ubuntu3.11","2.4.41-4ubuntu3.12","2.4.41-4ubuntu3.13","2.4.41-4ubuntu3.14","2.4.41-4ubuntu3.15","2.4.41-4ubuntu3.16","2.4.41-4ubuntu3.17","2.4.41-4ubuntu3.19"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.52-1ubuntu4.11"}]}],"versions":["2.4.48-3.1ubuntu3","2.4.48-3.1ubuntu4","2.4.51-2ubuntu1","2.4.52-1ubuntu1","2.4.52-1ubuntu2","2.4.52-1ubuntu4","2.4.52-1ubuntu4.1","2.4.52-1ubuntu4.2","2.4.52-1ubuntu4.3","2.4.52-1ubuntu4.4","2.4.52-1ubuntu4.5","2.4.52-1ubuntu4.6","2.4.52-1ubuntu4.7","2.4.52-1ubuntu4.8","2.4.52-1ubuntu4.9","2.4.52-1ubuntu4.10"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"apache2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.4.58-1ubuntu8.3"}]}],"versions":["2.4.57-2ubuntu2","2.4.57-2ubuntu3","2.4.58-1ubuntu1","2.4.58-1ubuntu2","2.4.58-1ubuntu6","2.4.58-1ubuntu7","2.4.58-1ubuntu8","2.4.58-1ubuntu8.1","2.4.58-1ubuntu8.2"]}],"references":[{"url":"https://ubuntu.com/security/notices/USN-6885-2","tags":["advisory"]},{"url":"https://launchpad.net/bugs/2072648","tags":["report"]}],"sources":{"osv":[{"id":"USN-6885-2","title":"apache2 regression","description":"USN-6885-1 fixed vulnerabilities in Apache HTTP Server. One of the security\nfixes introduced a regression when proxying requests to a HTTP/2 server.\nThis update fixes the problem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Marc Stern discovered that the Apache HTTP Server incorrectly handled\n serving WebSocket protocol upgrades over HTTP/2 connections. A remote\n attacker could possibly use this issue to cause the server to crash,\n resulting in a denial of service. (CVE-2024-36387)\n \n Orange Tsai discovered that the Apache HTTP Server mod_proxy module\n incorrectly sent certain request URLs with incorrect encodings to backends.\n A remote attacker could possibly use this issue to bypass authentication.\n (CVE-2024-38473)\n \n Orange Tsai discovered that the Apache HTTP Server mod_rewrite module\n incorrectly handled certain substitutions. A remote attacker could possibly\n use this issue to execute scripts in directories not directly reachable\n by any URL, or cause a denial of service. Some environments may require\n using the new UnsafeAllow3F flag to handle unsafe substitutions.\n (CVE-2024-38474, CVE-2024-38475, CVE-2024-39573)\n \n Orange Tsai discovered that the Apache HTTP Server incorrectly handled\n certain response headers. A remote attacker could possibly use this issue\n to obtain sensitive information, execute local scripts, or perform SSRF\n attacks. (CVE-2024-38476)\n \n Orange Tsai discovered that the Apache HTTP Server mod_proxy module\n incorrectly handled certain requests. A remote attacker could possibly use\n this issue to cause the server to crash, resulting in a denial of service.\n (CVE-2024-38477)\n \n It was discovered that the Apache HTTP Server incorrectly handled certain\n handlers configured via AddType. A remote attacker could possibly use this\n issue to obtain source code. (CVE-2024-39884)\n","status":"published","published":"2024-07-11T17:25:58Z","modified":"2026-04-22T10:49:16.648153Z","updated_at":"2026-11-02T16:58:17.914523Z"}]}}