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CVE-2019-13272

Linux Kernel Improper Privilege Management Vulnerability

Exploited in the wild

This vulnerability is on a Known Exploited Vulnerabilities catalogue, added 2021-12-10. Federal due date: 2022-06-10.

Apply updates per vendor instructions.

Public exploit code

Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.

Impact

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.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 3.16.52 before 3.16.71
from 4.1.39 before 4.2
from 4.4.40 before 4.4.185
from 4.8.16 before 4.9
from 4.9.1 before 4.9.185
from 4.10 before 4.14.133
DebianDebian Linux
Versions 8.0, 9.0, 10.0
FedoraprojectFedora
Version 29
CanonicalUbuntu Linux
Versions 16.04, 18.04, 19.04
RedhatEnterprise Linux
Versions 7.0, 8.0
RedhatEnterprise Linux For Arm 64
Version 7.0_aarch64
RedhatEnterprise Linux For Ibm Z Systems
Version 7.0_s390x
RedhatEnterprise Linux For Real Time
Version 8
RedhatEnterprise Linux For Real Time For Nfv
Version 8.0
RedhatEnterprise Linux For Real Time For Nfv Tus
Versions 8.2, 8.4, 8.6, 8.8
RedhatEnterprise Linux For Real Time Tus
Versions 8.2, 8.4, 8.6, 8.8
NetappAff A700s Firmware
All versions

References