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Message-ID: <86c70de9-3adb-a18c-23aa-0110d83dbdc2@redhat.com>
Date: Wed, 20 Apr 2022 15:58:20 +1000
From: Peter Hutterer <peter.hutterer@...hat.com>
To: oss-security@...ts.openwall.com
Subject: CVE-2022-1215 libinput format string vulnerability
Title: Format string vulnerability in libinput
Component: libinput, affecting all Wayland compositors and X.Org when
using xf86-input-libinput
Report URL: https://gitlab.freedesktop.org/libinput/libinput/-/issues/752
Reporter: Albin Eldstål-Ahrens and Lukas Lamster
CVSS: 7.1 AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
Disclosure date: Embargo cancelled due to an independent public bug filed
When a device is detected by libinput, libinput logs several messages
through log handlers set up by the callers. These log handlers usually
eventually result in a printf call. Logging happens with the privileges
of the caller, in the case of Xorg this may be root.
The device name ends up as part of the format string and a kernel device
with printf-style format string placeholders in the device name can
enable an attacker to run malicious code. An exploit is possible through
any device where the attacker controls the device name, e.g. /dev/uinput
or Bluetooth devices.
All versions of libinput since 1.10 (released Feb 2018) are affected.
The upstream patch is available as commit
2a8b8fde90d63d48ce09ddae44142674bbca1c28
libinput releases that include these patches are:
- 1.20.1
- 1.19.4
- 1.18.2
Releases of versions 1.17.x and earlier are not planned at this stage.
Many thanks to Albin Eldstål-Ahrens and Benjamin Svensson from Assured
AB for their discovery and responsible reporting of this issue.
This issue was independently discovered by Lukas Lamster. Many thanks
for their discovery and responsible reporting.
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