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.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
• v2.0•HIGH•Score: 7.2AV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 52.20%• Percentile: 99%

Affected Systems

• canonical•ubuntu_linux

  16.04 | 18.04 | 19.04

• debian•linux

  < 4.19.37-6 | < 4.19.37-6 | < 4.19.37-6 | < 4.19.37-6

• ubuntu•linux

  < 4.4.0-159.187 | < 4.15.0-58.64

• ubuntu•linux-aws

  < 4.4.0-1054.58 | < 4.4.0-1090.101 | < 4.15.0-1047.49

• ubuntu•linux-aws-fips

  < 4.15.0-2018.18 | all

• ubuntu•linux-aws-hwe

  < 4.15.0-1047.49~16.04.1

• ubuntu•linux-azure

  < 4.15.0-1059.64~14.04.1 | < 4.15.0-1055.60 | < 5.0.0-1014.14~18.04.1

• ubuntu•linux-azure-fde

  all

• ubuntu•linux-azure-fips

  < 4.15.0-2006.7 | all

• ubuntu•linux-bluefield

  all

• ubuntu•linux-fips

  < 4.4.0-1017.22

• ubuntu•linux-gcp

  < 4.15.0-1040.42~16.04.1 | < 4.15.0-1040.42

• ubuntu•linux-gcp-fips

  all

• ubuntu•linux-gke

  all

• ubuntu•linux-gke-4.15

  < 4.15.0-1040.42

• ubuntu•linux-hwe

  < 4.15.0-58.64~16.04.1 | < 5.0.0-25.26~18.04.1

• ubuntu•linux-hwe-edge

  all

• ubuntu•linux-intel-iot-realtime

  all

• ubuntu•linux-kvm

  < 4.4.0-1054.61 | < 4.15.0-1042.42

• ubuntu•linux-lts-xenial

  < 4.4.0-164.192~14.04.1

• ubuntu•linux-oem

  < 4.15.0-1050.57

• ubuntu•linux-oem-osp1

  < 5.0.0-1018.20

• ubuntu•linux-oracle

  < 4.15.0-1021.23~16.04.1 | < 4.15.0-1021.23

• ubuntu•linux-raspi-realtime

  all

• ubuntu•linux-raspi2

  < 4.4.0-1118.127 | < 4.15.0-1043.46

• ubuntu•linux-realtime

  all

• ubuntu•linux-riscv

  all | all

• ubuntu•linux-snapdragon

  < 4.4.0-1122.128 | < 4.15.0-1060.66

• debian•debian_linux

  8.0 | 9.0 | 10.0

• fedoraproject•fedora

  29

• linux•linux_kernel

  ≥ 3.16.52, < 3.16.71 | ≥ 4.1.39, < 4.2 | ≥ 4.4.40, < 4.4.185 | ≥ 4.8.16, < 4.9 | ≥ 4.9.1, < 4.9.185 | ≥ 4.10, < 4.14.133 | ≥ 4.15, < 4.19.58 | ≥ 4.20, < 5.1.17

• netapp•active_iq_unified_manager

  na

• netapp•aff_a700s_firmware

  na

• netapp•e-series_performance_analyzer

  na

• netapp•e-series_santricity_os_controller

  ≥ 11.0.0, ≤ 11.60.3

• netapp•h410c_firmware

  na

• netapp•h610s_firmware

  na

• netapp•hci_compute_node

  na

• netapp•hci_management_node

  na

• netapp•service_processor

  na

• netapp•solidfire

  na

• netapp•steelstore_cloud_integrated_storage

  na

• redhat•enterprise_linux

  7.0 | 8.0

• redhat•enterprise_linux_for_arm_64

  7.0_aarch64

• redhat•enterprise_linux_for_ibm_z_systems

  7.0_s390x

• redhat•enterprise_linux_for_real_time

  8

• redhat•enterprise_linux_for_real_time_for_nfv

  8.0

• redhat•enterprise_linux_for_real_time_for_nfv_tus

  8.2 | 8.4 | 8.6 | 8.8

• redhat•enterprise_linux_for_real_time_tus

  8.2 | 8.4 | 8.6 | 8.8

References (39)

• http://packetstormsecurity.com/files/153663/Linux-PTRACE_TRACEME-Broken-Permission-Object-Lifetime-Handling.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://github.com/torvalds/linux/commit/6994eefb0053799d2e07cd140df6c2ea106c41ee
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6994eefb0053799d2e07cd140df6c2ea106c41ee
• https://bugzilla.suse.com/show_bug.cgi?id=1140671
• https://bugzilla.redhat.com/show_bug.cgi?id=1730895
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OGRK5LYWBJ4E4SRI4DKX367NHYSI3VOH/
• https://www.debian.org/security/2019/dsa-4484
• https://seclists.org/bugtraq/2019/Jul/30
• https://seclists.org/bugtraq/2019/Jul/33
• https://lists.debian.org/debian-lts-announce/2019/07/msg00022.html
• https://lists.debian.org/debian-lts-announce/2019/07/msg00023.html
• http://packetstormsecurity.com/files/153702/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
• https://security.netapp.com/advisory/ntap-20190806-0001/
• https://access.redhat.com/errata/RHSA-2019:2405
• https://access.redhat.com/errata/RHSA-2019:2411
• https://usn.ubuntu.com/4093-1/
• https://usn.ubuntu.com/4094-1/
• https://usn.ubuntu.com/4095-1/
• http://packetstormsecurity.com/files/154245/Kernel-Live-Patch-Security-Notice-LSN-0054-1.html
• https://support.f5.com/csp/article/K91025336
• https://usn.ubuntu.com/4117-1/
• https://usn.ubuntu.com/4118-1/
• https://access.redhat.com/errata/RHSA-2019:2809
• https://support.f5.com/csp/article/K91025336?utm_source=f5support&amp%3Butm_medium=RSS
• 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://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-13272
• https://ubuntu.com/security/CVE-2019-13272
• https://ubuntu.com/security/notices/USN-4093-1
• https://ubuntu.com/security/notices/USN-4094-1
• https://ubuntu.com/security/notices/USN-4095-1
• https://ubuntu.com/security/notices/USN-4117-1
• https://ubuntu.com/security/notices/USN-4118-1
• https://www.cve.org/CVERecord?id=CVE-2019-13272
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• https://security-tracker.debian.org/tracker/CVE-2019-13272