[ASA-201911-11] linux-lts: arbitrary code execution

[Levente Polyak]

Arch Linux Security Advisory ASA-201911-11
==========================================

Severity: Critical
Date    : 2019-11-13
CVE-ID  : CVE-2019-17666
Package : linux-lts
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-1065

Summary
=======

The package linux-lts before version 4.19.82-1 is vulnerable to
arbitrary code execution.

Resolution
==========

Upgrade to 4.19.82-1.

# pacman -Syu "linux-lts>=4.19.82-1"

The problem has been fixed upstream in version 4.19.82.

Workaround
==========

When Wi-Fi usage is not required, disabling it mitigates the issue.

Description
===========

rtl_p2p_noa_ie in drivers/net/wireless/realtek/rtlwifi/ps.c in the
Linux kernel before 5.3.9, 4.19.82, 4.14.152, 4.9.199, 4.4.199 lacks a
certain upper-bound check, leading to a buffer overflow. An attacker is
able to trigger the overflow remotely through Wi-Fi by using a power-
saving feature known as a Notice of Absence when the Realtek (RTLWIFI)
driver is being used on the affected host leading to arbitrary code
execution.

Impact
======

A remote attacker in Wi-Fi range is able to execute arbitrary code when
the Realtek (RTLWIFI) driver is being used on the affected host.

References
==========

https://lkml.org/lkml/2019/10/16/1226
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8c55dedb795be8ec0cf488f98c03a1c2176f7fb1
https://security.archlinux.org/CVE-2019-17666

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