CVE-2017-16995

2017-12-2700:00:00

ubuntu.com

7.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.0005 Low

EPSS

Percentile

16.6%

JSON

The check_alu_op function in kernel/bpf/verifier.c in the Linux kernel
through 4.4 allows local users to cause a denial of service (memory
corruption) or possibly have unspecified other impact by leveraging
incorrect sign extension.

Bugs

<https://bugs.chromium.org/p/project-zero/issues/detail?id=1454>

Notes

Author	Note
tyhicks	Mitigation for this vulnerability is available by setting the kernel.unprivileged_bpf_disabled sysctl to 1: $ sudo sysctl kernel.unprivileged_bpf_disabled=1 $ echo kernel.unprivileged_bpf_disabled=1
smb	Current breaks sha1 (taken from the fix patch) only makes 4.14+ affected. However upstream stable backported a fix for it. So I will modify the breaks sha1 to point to when the surrounding code was added.

OSVersionArchitecturePackageVersionFilename
ubuntu17.10noarchlinux< 4.13.0-25.29UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-119.143UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1016.16UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1054.63UNKNOWN
ubuntu16.04noarchlinux-azure< 4.13.0-1005.7UNKNOWN
ubuntu16.04noarchlinux-euclid< 4.4.0-9026.28UNKNOWN
ubuntu16.04noarchlinux-gcp< 4.13.0-1006.9UNKNOWN
ubuntu16.04noarchlinux-hwe< 4.13.0-26.29~16.04.2UNKNOWN
ubuntu18.04noarchlinux-hwe-edge< 4.18.0-8.9~18.04.1UNKNOWN
ubuntu16.04noarchlinux-hwe-edge< 4.13.0-26.29~16.04.2UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	17.10	noarch	linux	< 4.13.0-25.29	UNKNOWN
ubuntu	16.04	noarch	linux	< 4.4.0-119.143	UNKNOWN
ubuntu	14.04	noarch	linux-aws	< 4.4.0-1016.16	UNKNOWN
ubuntu	16.04	noarch	linux-aws	< 4.4.0-1054.63	UNKNOWN
ubuntu	16.04	noarch	linux-azure	< 4.13.0-1005.7	UNKNOWN
ubuntu	16.04	noarch	linux-euclid	< 4.4.0-9026.28	UNKNOWN
ubuntu	16.04	noarch	linux-gcp	< 4.13.0-1006.9	UNKNOWN
ubuntu	16.04	noarch	linux-hwe	< 4.13.0-26.29~16.04.2	UNKNOWN
ubuntu	18.04	noarch	linux-hwe-edge	< 4.18.0-8.9~18.04.1	UNKNOWN
ubuntu	16.04	noarch	linux-hwe-edge	< 4.13.0-26.29~16.04.2	UNKNOWN