Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2017-1000405

7.0 · HIGH

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.

Published Nov 30, 2017CWE-362EPSS 2.84%

Overview

CVE-2017-1000405 is a high-severity vulnerability. It was published on November 30, 2017 and has a CVSS 3.1 base score of 7.0 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/102032Refwww.securitytracker.com/id/1040020Refaccess.redhat.com/errata/RHSA-2018:0180Refmedium.com/bindecy/huge-dirty-cow-cve-2017-1000405-110eca132de0Refsource.android.com/security/bulletin/pixel/2018-02-01Refwww.exploit-db.com/exploits/43199/Refwww.securityfocus.com/bid/102032Refwww.securitytracker.com/id/1040020Refaccess.redhat.com/errata/RHSA-2018:0180Refmedium.com/bindecy/huge-dirty-cow-cve-2017-1000405-110eca132de0

How CyberStrike helps

Frequently asked questions

What is CVE-2017-1000405?

CVE-2017-1000405 is a high-severity vulnerability. It was published on November 30, 2017 and has a CVSS 3.1 base score of 7.0 (HIGH).

How severe is CVE-2017-1000405?

This vulnerability has a CVSS 3.1 base score of 7.0, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2017-1000405?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-1000405?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-1000405 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2017

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999