Privilege Dropping / Lowering Errors Affecting kernel-modules package, versions <0:4.18.0-80.7.2.el8_0
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Test your applications- Snyk ID SNYK-RHEL8-KERNELMODULES-1377266
- published 26 Jul 2021
- disclosed 16 Jul 2019
Introduced: 16 Jul 2019
CVE-2019-13272 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-modules to version 0:4.18.0-80.7.2.el8_0 or higher.
This issue was patched in RHSA-2019:2411.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-modules package and not the kernel-modules package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
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://seclists.org/bugtraq/2019/Jul/30
- https://seclists.org/bugtraq/2019/Jul/33
- https://bugzilla.redhat.com/show_bug.cgi?id=1730895
- https://bugzilla.suse.com/show_bug.cgi?id=1140671
- https://security.netapp.com/advisory/ntap-20190806-0001/
- https://support.f5.com/csp/article/K91025336
- https://support.f5.com/csp/article/K91025336?utm_source=f5support&utm_medium=RSS
- https://access.redhat.com/security/cve/CVE-2019-13272
- https://www.debian.org/security/2019/dsa-4484
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OGRK5LYWBJ4E4SRI4DKX367NHYSI3VOH/
- http://packetstormsecurity.com/files/153663/Linux-PTRACE_TRACEME-Broken-Permission-Object-Lifetime-Handling.html
- http://packetstormsecurity.com/files/153702/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
- http://packetstormsecurity.com/files/154245/Kernel-Live-Patch-Security-Notice-LSN-0054-1.html
- 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
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1903
- 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://lists.debian.org/debian-lts-announce/2019/07/msg00022.html
- https://lists.debian.org/debian-lts-announce/2019/07/msg00023.html
- https://access.redhat.com/errata/RHSA-2019:2411
- https://usn.ubuntu.com/4093-1/
- https://usn.ubuntu.com/4094-1/
- https://usn.ubuntu.com/4095-1/
- https://usn.ubuntu.com/4117-1/
- https://usn.ubuntu.com/4118-1/
- http://packetstormsecurity.com/files/165051/Linux-Kernel-5.1.x-PTRACE_TRACEME-pkexec-Local-Privilege-Escalation.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OGRK5LYWBJ4E4SRI4DKX367NHYSI3VOH/
- https://support.f5.com/csp/article/K91025336?utm_source=f5support&%3Butm_medium=RSS
- https://www.exploit-db.com/exploits/50541
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog