CVE ID:	CVE-2019-13272
Description:	In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to create a ptrace relationship, which allows local users to obtain root access by leveraging certain scenarios with a parent-child process relationship, where a parent drops privileges and calls execve (potentially allowing control by an attacker). One contributing factor is an object lifetime issue (which can also cause a panic). Another contributing factor is incorrect marking of a ptrace relationship as privileged, which is exploitable through (for example) Polkit's pkexec helper with PTRACE_TRACEME. NOTE: SELinux deny_ptrace might be a usable workaround in some environments.
Test IDs:	1.3.6.1.4.1.25623.1.0.704484   1.3.6.1.4.1.25623.1.0.891863   1.3.6.1.4.1.25623.1.0.891862   1.3.6.1.4.1.25623.1.0.876583
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2019-13272 Bugtraq: 20190722 [SECURITY] [DSA 4484-1] linux security update (Google Search) https://seclists.org/bugtraq/2019/Jul/30 Bugtraq: 20190722 [slackware-security] Slackware 14.2 kernel (SSA:2019-202-01) (Google Search) https://seclists.org/bugtraq/2019/Jul/33 Debian Security Information: DSA-4484 (Google Search) https://www.debian.org/security/2019/dsa-4484 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGRK5LYWBJ4E4SRI4DKX367NHYSI3VOH/ http://packetstormsecurity.com/files/153663/Linux-PTRACE_TRACEME-Broken-Permission-Object-Lifetime-Handling.html http://packetstormsecurity.com/files/153702/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html http://packetstormsecurity.com/files/154245/Kernel-Live-Patch-Security-Notice-LSN-0054-1.html http://packetstormsecurity.com/files/154957/Linux-Polkit-pkexec-Helper-PTRACE_TRACEME-Local-Root.html http://packetstormsecurity.com/files/156929/Linux-PTRACE_TRACEME-Local-Root.html http://packetstormsecurity.com/files/165051/Linux-Kernel-5.1.x-PTRACE_TRACEME-pkexec-Local-Privilege-Escalation.html https://bugs.chromium.org/p/project-zero/issues/detail?id=1903 https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.1.17 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6994eefb0053799d2e07cd140df6c2ea106c41ee https://github.com/torvalds/linux/commit/6994eefb0053799d2e07cd140df6c2ea106c41ee https://lists.debian.org/debian-lts-announce/2019/07/msg00022.html https://lists.debian.org/debian-lts-announce/2019/07/msg00023.html RedHat Security Advisories: RHSA-2019:2405 https://access.redhat.com/errata/RHSA-2019:2405 RedHat Security Advisories: RHSA-2019:2411 https://access.redhat.com/errata/RHSA-2019:2411 RedHat Security Advisories: RHSA-2019:2809 https://access.redhat.com/errata/RHSA-2019:2809 https://usn.ubuntu.com/4093-1/ https://usn.ubuntu.com/4094-1/ https://usn.ubuntu.com/4095-1/ https://usn.ubuntu.com/4117-1/ https://usn.ubuntu.com/4118-1/