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CVE-2017-1000405

Status Candidate

Overview

The Linux Kernel versions 2.6.38 through 4.14 have a problematic use of pmd_mkdirty() in the touch_pmd() function inside the THP implementation. touch_pmd() can be reached by get_user_pages(). In such case, the pmd will become dirty. This scenario breaks the new can_follow_write_pmd()'s logic - pmd can become dirty without going through a COW cycle. This bug is not as severe as the original "Dirty cow" because an ext4 file (or any other regular file) cannot be mapped using THP. Nevertheless, it does allow us to overwrite read-only huge pages. For example, the zero huge page and sealed shmem files can be overwritten (since their mapping can be populated using THP). Note that after the first write page-fault to the zero page, it will be replaced with a new fresh (and zeroed) thp.

Related Files

Red Hat Security Advisory 2018-0180-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0180-01 - The kernel-alt packages provide the Linux kernel version 4.x. Security Fix: A flaw was found in the patches used to fix the 'dirtycow' vulnerability. An attacker, able to run local code, can exploit a race condition in transparent huge pages to modify usually read-only huge pages.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2017-1000405
MD5 | 183909bb5d69472d7a91079d8bd18614
Ubuntu Security Notice USN-3509-4
Posted Dec 15, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3509-4 - USN-3509-2 fixed vulnerabilities in the Linux Hardware Enablement kernel for Ubuntu 14.04 LTS. Unfortunately, it also introduced a regression that prevented the Ceph network filesystem from being used. This update fixes the problem. Various other issues were also addressed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12193, CVE-2017-16643, CVE-2017-16939
MD5 | ee7adf44f0d4c560968cb5bb9e43ee32
Ubuntu Security Notice USN-3509-3
Posted Dec 15, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3509-3 - USN-3509-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. Unfortunately, it also introduced a regression that prevented the Ceph network filesystem from being used. This update fixes the problem. Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12193, CVE-2017-16643, CVE-2017-16939
MD5 | 7b0de306b43e15046d1562aa3c463ed8
Kernel Live Patch Security Notice LSN-0033-1
Posted Dec 9, 2017
Authored by Benjamin M. Romer

Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service (application crashes) or possibly gain administrative privileges. It was discovered that a race condition existed in the ALSA subsystem of the Linux kernel when creating and deleting a port via ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux
advisories | CVE-2017-1000405, CVE-2017-15265, CVE-2017-16939
MD5 | ca77a2333d4c9ee49fdd8d0056475a48
Ubuntu Security Notice USN-3507-2
Posted Dec 9, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3507-2 - Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12193, CVE-2017-15299, CVE-2017-15306, CVE-2017-15951, CVE-2017-16939
MD5 | e4e9ca45d6a9e4cece95a15bfca16c42
Ubuntu Security Notice USN-3511-1
Posted Dec 9, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3511-1 - Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-16939
MD5 | 9e7a4f198355b4645387c08f75f34134
Ubuntu Security Notice USN-3510-2
Posted Dec 9, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3510-2 - USN-3510-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 ESM. Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-16939
MD5 | a759e1476a777349ca39f619d2d7e469
Ubuntu Security Notice USN-3510-1
Posted Dec 9, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3510-1 - Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-16939
MD5 | c760dcb9902f64f23bb4e67232a51fbb
Ubuntu Security Notice USN-3509-2
Posted Dec 7, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3509-2 - USN-3509-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12193, CVE-2017-16643, CVE-2017-16939
MD5 | 9992cce2660b19d70d3414673f02ab80
Ubuntu Security Notice USN-3509-1
Posted Dec 7, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3509-1 - Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12193, CVE-2017-16643, CVE-2017-16939
MD5 | ecebac920cb50284c6fd809011424590
Ubuntu Security Notice USN-3508-2
Posted Dec 7, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3508-2 - USN-3508-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.04. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS. Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12146, CVE-2017-16939
MD5 | bc816d54ebe529dd5225953bb2b33b51
Ubuntu Security Notice USN-3508-1
Posted Dec 7, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3508-1 - Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12146, CVE-2017-16939
MD5 | 61ffeaad7d5d235842725a3fe5d4f465
Ubuntu Security Notice USN-3507-1
Posted Dec 7, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3507-1 - Mohamed Ghannam discovered that a use-after-free vulnerability existed in the Netlink subsystem in the Linux kernel. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the Linux kernel did not properly handle copy-on- write of transparent huge pages. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-1000405, CVE-2017-12193, CVE-2017-15299, CVE-2017-15306, CVE-2017-15951, CVE-2017-16535, CVE-2017-16643, CVE-2017-16939
MD5 | ee6c4d967ff24654f431006a52b99e57
Huge Dirty Cow Proof Of Concept
Posted Nov 30, 2017
Authored by bindecy

This is a proof of concept for the Huge Dirty Cow vulnerability (CVE-2017-1000405). Before running, make sure to set transparent huge pages to "always" with "echo always | sudo tee /sys/kernel/mm/transparent_hugepage/enabled".

tags | exploit, kernel, proof of concept
advisories | CVE-2017-1000405
MD5 | 9d2549b018a6567383860ce3ca06d79a
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