Linux Kernel up to 4.11.4 vmwgfx_surface.c vmw_gb_surface_define_ioctl backup_handle Kernel Memory information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 4.11.4 and classified as problematic. The affected element is the function vmw_gb_surface_define_ioctl of the file drivers/gpu/drm/vmwgfx/vmwgfx_surface.c. The manipulation of the argument backup_handle as part of IOCTL Call results in information disclosure (Kernel Memory). This vulnerability is reported as CVE-2017-9605. The attack requires a local approach. No exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 4.11.4 (Operating System). It has been classified as problematic. Affected is the function vmw_gb_surface_define_ioctl of the file drivers/gpu/drm/vmwgfx/vmwgfx_surface.c. The manipulation of the argument backup_handle as part of a IOCTL Call leads to a information disclosure vulnerability (Kernel Memory). CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

The vmw_gb_surface_define_ioctl function (accessible via DRM_IOCTL_VMW_GB_SURFACE_CREATE) in drivers/gpu/drm/vmwgfx/vmwgfx_surface.c in the Linux kernel through 4.11.4 defines a backup_handle variable but does not give it an initial value. If one attempts to create a GB surface, with a previously allocated DMA buffer to be used as a backup buffer, the backup_handle variable does not get written to and is then later returned to user space, allowing local users to obtain sensitive information from uninitialized kernel memory via a crafted ioctl call.

The bug was discovered 06/02/2017. The weakness was disclosed 06/13/2017 by Murray McAllister as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2017-9605 since 06/13/2017. The attack needs to be approached locally. A authentication is needed for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.

The vulnerability was handled as a non-public zero-day exploit for at least 11 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 101893 (Ubuntu 17.04 : linux, linux-raspi2 vulnerabilities (USN-3358-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196854 (Ubuntu Security Notification for Linux Vulnerabilities (USN-3360-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (101893) and SecurityFocus (BID 99095†). The entries VDB-90537, VDB-90545, VDB-92517 and VDB-93975 are pretty similar. Once again VulDB remains the best source for vulnerability data.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Name: Kernel Memory
Class: Information disclosure / Kernel Memory
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 101893
Nessus Name: Ubuntu 17.04 : linux, linux-raspi2 vulnerabilities (USN-3358-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703926
OpenVAS Name: Debian Security Advisory DSA 3927-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: git.kernel.org

Timelineinfo

06/02/2017 🔍
06/13/2017 +11 days 🔍
06/13/2017 +0 days 🔍
06/13/2017 +0 days 🔍
06/14/2017 +1 days 🔍
06/16/2017 +2 days 🔍
07/20/2017 +34 days 🔍
07/21/2017 +1 days 🔍
12/08/2022 +1966 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-3358-1
Researcher: Murray McAllister
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-9605 (🔍)
GCVE (CVE): GCVE-0-2017-9605
GCVE (VulDB): GCVE-100-102372

OVAL: 🔍

SecurityFocus: 99095 - Linux Kernel 'drivers/gpu/drm/vmwgfx/vmwgfx_surface.c' Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 06/14/2017 05:32
Updated: 12/08/2022 14:08
Changes: 06/14/2017 05:32 (84), 10/17/2019 09:20 (6), 12/08/2022 14:08 (5)
Complete: 🔍
Cache ID: 216::103

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