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archlinuxArchLinuxASA-201612-8
HistoryDec 07, 2016 - 12:00 a.m.

[ASA-201612-8] linux-zen: privilege escalation

2016-12-0700:00:00
security.archlinux.org
518

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

0.0004 Low

EPSS

Percentile

8.6%

Arch Linux Security Advisory ASA-201612-8

Severity: High
Date : 2016-12-07
CVE-ID : CVE-2016-8655
Package : linux-zen
Type : privilege escalation
Remote : No
Link : https://wiki.archlinux.org/index.php/CVE

Summary

The package linux-zen before version 4.8.12-2 is vulnerable to
privilege escalation.

Resolution

Upgrade to 4.8.12-2.

pacman -Syu “linux-zen>=4.8.12-2”

The problem has been fixed upstream but no release is available yet.

Workaround

None.

Description

A race condition issue leading to a use-after-free flaw was found in
the way the raw packet sockets implementation in the Linux kernel
networking subsystem handled synchronization while creating the
TPACKET_V3 ring buffer. A local user able to open a raw packet socket
(requires the CAP_NET_RAW capability) could use this flaw to elevate
their privileges on the system.

Impact

A local attacker with CAP_NET_RAW capabilities is able to crash the
system or run arbitrary code with administrative privileges.

References

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=84ac7260236a49c79eede91617700174c2c19b0c
http://seclists.org/oss-sec/2016/q4/607
https://access.redhat.com/security/cve/CVE-2016-8655

OSVersionArchitecturePackageVersionFilename
ArchLinuxanyanylinux-zen< 4.8.12-2UNKNOWN

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

0.0004 Low

EPSS

Percentile

8.6%