UBUNTU-CVE-2019-13272

Dashboard / Vulnerabilities / UBUNTU-CVE-2019-13272

UBUNTU-CVE-2019-13272

Summary:

Details: 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.

References: https://ubuntu.com/security/CVE-2019-13272, http://packetstormsecurity.com/files/153663/Linux-PTRACE_TRACEME-Broken-Permission-Object-Lifetime-Handling.html, https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6994eefb0053799d2e07cd140df6c2ea106c41ee, 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