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In Apache HTTP Server 2.4 releases 2.4.17 to 2.4.38, with MPM event, worker or prefork, code executing in less-privileged child processes or threads (including scripts executed by an in-process scripting interpreter) could execute arbitrary code with the privileges of the parent process (usually root) by manipulating the scoreboard. Non-Unix systems are not affected.

• http://www.openwall.com/lists/oss-security/2019/04/02/3 mailing-listx_refsource_MLIST
• http://www.securityfocus.com/bid/107666 vdb-entryx_refsource_BID
• https://seclists.org/bugtraq/2019/Apr/5 mailing-listx_refsource_BUGTRAQ
• https://www.synology.com/security/advisory/Synology_SA_19_14 x_refsource_CONFIRM
• http://packetstormsecurity.com/files/152386/Apache-2.4.38-Root-Privilege-Escalation.html x_refsource_MISC
• https://usn.ubuntu.com/3937-1/ vendor-advisoryx_refsource_UBUNTU
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WETXNQWNQLWHV6XNW6YTO5UGDTIWAQGT/ vendor-advisoryx_refsource_FEDORA
• https://www.debian.org/security/2019/dsa-4422 vendor-advisoryx_refsource_DEBIAN
• https://lists.apache.org/thread.html/b1613d44ec364c87bb7ee8c5939949f9b061c05c06e0e90098ebf7aa%40%3Cusers.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EZRMTEIGZKYFNGIDOTXN3GNEJTLVCYU7/ vendor-advisoryx_refsource_FEDORA
• https://seclists.org/bugtraq/2019/Apr/16 mailing-listx_refsource_BUGTRAQ
• https://www.exploit-db.com/exploits/46676/ exploitx_refsource_EXPLOIT-DB
• https://httpd.apache.org/security/vulnerabilities_24.html x_refsource_MISC
• http://packetstormsecurity.com/files/152415/Slackware-Security-Advisory-httpd-Updates.html x_refsource_MISC
• http://packetstormsecurity.com/files/152441/CARPE-DIEM-Apache-2.4.x-Local-Privilege-Escalation.html x_refsource_MISC
• http://www.apache.org/dist/httpd/CHANGES_2.4.39 x_refsource_MISC
• https://lists.apache.org/thread.html/890507b85c30adf133216b299cc35cd8cd0346a885acfc671c04694e%40%3Cdev.community.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/b2bdb308dc015e771ba79c0586b2de6fb50caa98b109833f5d4daf28%40%3Cdev.community.apache.org%3E mailing-listx_refsource_MLIST
• https://access.redhat.com/errata/RHSA-2019:0746 vendor-advisoryx_refsource_REDHAT
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00051.html vendor-advisoryx_refsource_SUSE
• https://lists.apache.org/thread.html/de881a130bc9cb2f3a9ff220784520556884fb8ea80e69400a45509e%40%3Cdev.community.apache.org%3E mailing-listx_refsource_MLIST
• https://support.f5.com/csp/article/K32957101 x_refsource_CONFIRM
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00061.html vendor-advisoryx_refsource_SUSE
• https://security.gentoo.org/glsa/201904-20 vendor-advisoryx_refsource_GENTOO
• https://security.netapp.com/advisory/ntap-20190423-0001/ x_refsource_CONFIRM
• http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00084.html vendor-advisoryx_refsource_SUSE
• https://access.redhat.com/errata/RHSA-2019:0980 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHBA-2019:0959 vendor-advisoryx_refsource_REDHAT
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ALIR5S3O7NRHEGFMIDMUSYQIZOE4TJJN/ vendor-advisoryx_refsource_FEDORA
• https://access.redhat.com/errata/RHSA-2019:1297 vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/errata/RHSA-2019:1296 vendor-advisoryx_refsource_REDHAT
• https://lists.apache.org/thread.html/fd110f4ace2d8364c7d9190e1993cde92f79e4eb85576ed9285686ac%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://access.redhat.com/errata/RHSA-2019:1543 vendor-advisoryx_refsource_REDHAT
• https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html x_refsource_MISC
• http://www.openwall.com/lists/oss-security/2019/07/26/7 mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03950en_us x_refsource_CONFIRM
• https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html x_refsource_MISC
• https://lists.apache.org/thread.html/r6d03e45b81eab03580cf7f8bb51cb3e9a1b10a2cc0c6a2d3cc92ed0c%40%3Cannounce.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://www.oracle.com/security-alerts/cpuapr2020.html x_refsource_MISC
• https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/r06f0d87ebb6d59ed8379633f36f72f5b1f79cadfda72ede0830b42cf%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/r03ee478b3dda3e381fd6189366fa7af97c980d2f602846eef935277d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/rd2fb621142e7fa187cfe12d7137bf66e7234abcbbcd800074c84a538%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/re473305a65b4db888e3556e4dae10c2a04ee89dcff2e26ecdbd860a9%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E mailing-listx_refsource_MLIST
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0211 government-resource