CVE-2017-1000405 Detail
Modified
This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
Current 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.
Source:
MITRE
Description Last Modified:
11/30/2017
View Analysis Description
Analysis 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.
Source:
MITRE
Description Last Modified:
11/30/2017
Impact
CVSS v3.0 Severity and Metrics:
Base Score:
7.0 HIGH
Vector:
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
(V3 legend)
Impact Score:
5.9
Exploitability Score:
1.0
Attack Vector (AV):
Local
Attack Complexity (AC):
High
Privileges Required (PR):
Low
User Interaction (UI):
None
Scope (S):
Unchanged
Confidentiality (C):
High
Integrity (I):
High
Availability (A):
High
CVSS v2.0 Severity and Metrics:
Base Score:
6.9 MEDIUM
Vector:
(AV:L/AC:M/Au:N/C:C/I:C/A:C)
(V2 legend)
Impact Subscore:
10.0
Exploitability Subscore:
3.4
Access Vector (AV):
Local
Access Complexity (AC):
Medium
Authentication (AU):
None
Confidentiality (C):
Complete
Integrity (I):
Complete
Availability (A):
Complete
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because
they may have information that would be of interest to you. No inferences should be drawn on account of other sites
being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose.
NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further,
NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about
this page to nvd@nist.gov.
Change History
6 change records found
- show changes
CVE Modified by MITRE -
2/12/2018 9:29:00 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
https://source.android.com/security/bulletin/pixel/2018-02-01 [No Types Assigned] |
CVE Modified by MITRE -
1/26/2018 9:29:00 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
https://access.redhat.com/errata/RHSA-2018:0180 [No Types Assigned] |
CVE Modified by MITRE -
12/23/2017 9:29:12 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
http://www.securitytracker.com/id/1040020 [No Types Assigned] |
Initial Analysis -
12/20/2017 8:52:06 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.38 up to (including) 4.14 |
| Added |
CVSS V2 |
|
(AV:L/AC:M/Au:N/C:C/I:C/A:C) |
| Added |
CVSS V3 |
|
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| Added |
CWE |
|
CWE-362 |
| Changed |
Reference Type |
http://www.securityfocus.com/bid/102032 No Types Assigned |
http://www.securityfocus.com/bid/102032 Third Party Advisory, VDB Entry |
| Changed |
Reference Type |
https://medium.com/bindecy/huge-dirty-cow-cve-2017-1000405-110eca132de0 No Types Assigned |
https://medium.com/bindecy/huge-dirty-cow-cve-2017-1000405-110eca132de0 Exploit, Issue Tracking, Third Party Advisory |
| Changed |
Reference Type |
https://www.exploit-db.com/exploits/43199/ No Types Assigned |
https://www.exploit-db.com/exploits/43199/ Exploit, Issue Tracking, Third Party Advisory, VDB Entry |
CVE Modified by MITRE -
12/5/2017 9:29:06 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
http://www.securityfocus.com/bid/102032 [No Types Assigned] |
CVE Modified by MITRE -
12/2/2017 9:29:00 PM
| Action |
Type |
Old Value |
New Value |
| Added |
Reference |
|
https://www.exploit-db.com/exploits/43199/ [No Types Assigned] |
Quick Info
CVE Dictionary Entry:
CVE-2017-1000405
NVD Published Date:
11/30/2017
NVD Last Modified:
02/12/2018
|