Current Description
An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.
Source:
MITRE
Description Last Modified:
06/21/2018
View Analysis Description
Analysis Description
An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.
Source:
MITRE
Description Last Modified:
06/21/2018
Impact
CVSS v3.0 Severity and Metrics:
Base Score:
6.3 MEDIUM
Vector:
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
(V3 legend)
Impact Score:
5.2
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):
None
Availability (A):
High
CVSS v2.0 Severity and Metrics:
Base Score:
6.3 MEDIUM
Vector:
(AV:L/AC:M/Au:N/C:C/I:N/A:C)
(V2 legend)
Impact Subscore:
9.2
Exploitability Subscore:
3.4
Access Vector (AV):
Local
Access Complexity (AC):
Medium
Authentication (AU):
None
Confidentiality (C):
Complete
Integrity (I):
None
Availability (A):
Complete
Additional Information:
Allows unauthorized disclosure of information
Allows disruption of service
References to Advisories, Solutions, and Tools
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Change History
1 change record found
- show changes
Initial Analysis -
8/21/2018 11:42:37 AM
| Action |
Type |
Old Value |
New Value |
| Added |
CPE Configuration |
|
OR
*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (including) 4.17.2 |
| Added |
CVSS V2 |
|
(AV:L/AC:M/Au:N/C:C/I:N/A:C) |
| Added |
CVSS V3 |
|
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H |
| Added |
CWE |
|
CWE-362 |
| Changed |
Reference Type |
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba No Types Assigned |
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba Patch, Vendor Advisory |
| Changed |
Reference Type |
https://bugzilla.kernel.org/show_bug.cgi?id=200131 No Types Assigned |
https://bugzilla.kernel.org/show_bug.cgi?id=200131 Issue Tracking, Vendor Advisory |
| Changed |
Reference Type |
https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba No Types Assigned |
https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba Patch, Third Party Advisory |