National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-12633 Detail

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

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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Hyperlink Resource
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba Patch Vendor Advisory
https://bugzilla.kernel.org/show_bug.cgi?id=200131 Issue Tracking Vendor Advisory
https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba Patch Third Party Advisory

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (including)
4.17.2


Change History

1 change record found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-12633
NVD Published Date:
06/21/2018
NVD Last Modified:
08/21/2018