CVE-2019-13272

 

Published at: - 17-07-2019 03:15

Last modified: - 17-01-2023 10:25

Total changes: - 6

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

 

Verification logic

 

Reference

• https://bugs.chromium.org/p/project-zero/issues/detail?id=1903
• http://packetstormsecurity.com/files/153663/Linux-PTRACE_TRACEME-Broken-Permission-Object-Lifetime-Handling.html
• 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
• FEDORA-2019-a95015e60f-Third Party Advisory
• DSA-4484-Third Party Advisory
• 20190722 [SECURITY] [DSA 4484-1] linux security update-Issue Tracking, Mailing List, Third Party Advisory
• 20190722 [slackware-security] Slackware 14.2 kernel (SSA:2019-202-01)-Issue Tracking, Mailing List, Third Party Advisory
• [debian-lts-announce] 20190723 [SECURITY] [DLA 1863-1] linux-4.9 security update-Mailing List, Third Party Advisory
• [debian-lts-announce] 20190723 [SECURITY] [DLA 1862-1] linux security update-Mailing List, Third Party Advisory
• http://packetstormsecurity.com/files/153702/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
• https://security.netapp.com/advisory/ntap-20190806-0001/
• RHSA-2019:2405-Third Party Advisory
• RHSA-2019:2411-Third Party Advisory
• USN-4095-1-Third Party Advisory
• USN-4094-1-Third Party Advisory
• USN-4093-1-Third Party Advisory
• http://packetstormsecurity.com/files/154245/Kernel-Live-Patch-Security-Notice-LSN-0054-1.html
• https://support.f5.com/csp/article/K91025336
• USN-4117-1-Third Party Advisory
• USN-4118-1-Third Party Advisory
• RHSA-2019:2809-Third Party Advisory
• https://support.f5.com/csp/article/K91025336?utm_source=f5support&utm_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

 

Keywords

NVD

 

CVE-2019-13272

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures