Vulnerability Name:

CVE-2017-9605 (CCN-127205)

Assigned:2017-06-02
Published:2017-06-02
Updated:2017-11-04
Summary: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.
CVSS v3 Severity:5.5 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
4.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
6.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N)
5.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): None
Availibility (A): None
CVSS v2 Severity:4.9 Medium (CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): None
Availibility (A): None
4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:N/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): None
Availibility (A): None
Vulnerability Type:CWE-200
Vulnerability Consequences:Obtain Information
References:Source: MITRE
Type: CNA
CVE-2017-9605

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=07678eca2cf9c9a18584e546c2b2a0d0c9a3150c

Source: DEBIAN
Type: UNKNOWN
DSA-3927

Source: DEBIAN
Type: UNKNOWN
DSA-3945

Source: BID
Type: Third Party Advisory, VDB Entry
99095

Source: CCN
Type: BID-99095
Linux Kernel 'drivers/gpu/drm/vmwgfx/vmwgfx_surface.c' Local Information Disclosure Vulnerability

Source: XF
Type: UNKNOWN
linux-kernel-cve20179605-info-disc(127205)

Source: CCN
Type: Linux Kernel GIT Repository
drm/vmwgfx: Make sure backup_handle is always valid

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
https://github.com/torvalds/linux/commit/07678eca2cf9c9a18584e546c2b2a0d0c9a3150c

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version <= 4.11.4)

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.11.4:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.artful:def:20179605000
    V
    		CVE-2017-9605 on Ubuntu 17.10 (artful) - low.
    2017-06-13
    oval:com.ubuntu.trusty:def:20179605000
    V
    		CVE-2017-9605 on Ubuntu 14.04 LTS (trusty) - low.
    2017-06-13
    oval:com.ubuntu.xenial:def:20179605000
    V
    		CVE-2017-9605 on Ubuntu 16.04 LTS (xenial) - low.
    2017-06-13
    oval:com.ubuntu.xenial:def:201796050000000
    V
    		CVE-2017-9605 on Ubuntu 16.04 LTS (xenial) - low.
    2017-06-13
    BACK
    linux linux kernel *
    linux linux kernel 4.11.4