Trending CVEs for the Week of August 5th, 2019

CVE-2019-13272 – Linux Kernel Privilege Escalation Vulnerability Alert

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.

Affected Packages

  • Red Hat OpenShift Container Platform 4.1 | kernel
  • Red Hat Enterprise Linux 7 | kernel

Fixes

For mitigation, please refer to the Red Hat Knowledge base article: https://access.redhat.com/articles/4292201

References

National Vulnerability Database

Red Hat Security Advisor