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Red Hat: CVE-2019-13272: CVE-2019-13272 kernel: broken permission and object lifetime handling for PTRACE_TRACEME (Multiple Advisories)

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Red Hat: CVE-2019-13272: CVE-2019-13272 kernel: broken permission and object lifetime handling for PTRACE_TRACEME (Multiple Advisories)

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
07/17/2019
Created
08/09/2019
Added
08/08/2019
Modified
03/13/2024

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.

Solution(s)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • DSA-4484
  • CVE-2019-13272
  • RHSA-2019:2405
  • RHSA-2019:2411
  • RHSA-2019:2809

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