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CVE-2017-14604

Status Candidate

Overview

GNOME Nautilus before 3.23.90 allows attackers to spoof a file type by using the .desktop file extension, as demonstrated by an attack in which a .desktop file's Name field ends in .pdf but this file's Exec field launches a malicious "sh -c" command. In other words, Nautilus provides no UI indication that a file actually has the potentially unsafe .desktop extension; instead, the UI only shows the .pdf extension. One (slightly) mitigating factor is that an attack requires the .desktop file to have execute permission. The solution is to ask the user to confirm that the file is supposed to be treated as a .desktop file, and then remember the user's answer in the metadata::trusted field.

Related Files

Red Hat Security Advisory 2018-0223-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0223-01 - Nautilus is the file manager and graphical shell for the GNOME desktop. Security Fix: An untrusted .desktop file with executable permission set could choose its displayed name and icon, and execute commands without warning when opened by the user. An attacker could use this flaw to trick a user into opening a .desktop file disguised as a document, such as a PDF, and execute arbitrary commands. Note: This update will change the behavior of Nautilus. Nautilus will now prompt the user for confirmation when executing an untrusted .desktop file for the first time, and then add it to the trusted file list. Desktop files stored in the system directory, as specified by the XDG_DATA_DIRS environment variable, are always considered trusted and executed without prompt.

tags | advisory, arbitrary, shell
systems | linux, redhat
advisories | CVE-2017-14604
SHA-256 | 711d572be4e6502a88c9e3ecdba7b30faf259488211721ff7c708ff3a15c3f0a
Debian Security Advisory 3994-1
Posted Oct 9, 2017
Authored by Debian | Site debian.org

Debian Linux Security Advisory 3994-1 - Christian BoxdAPrfer discovered a vulnerability in the handling of FreeDesktop.org .desktop files in Nautilus, a file manager for the GNOME desktop environment. An attacker can craft a .desktop file intended to run malicious commands but displayed as a innocuous document file in Nautilus. An user would then trust it and open the file, and Nautilus would in turn execute the malicious content. Nautilus protection of only trusting .desktop files with executable permission can be bypassed by shipping the .desktop file inside a tarball.

tags | advisory
systems | linux, debian
advisories | CVE-2017-14604
SHA-256 | 3715d208820664621570bc5d85aecbd5c86a5bc7ae5fc046cc22288a7e55adc3
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