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Debian LTS Advisory DLA-3706-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                      Markus Koschany
January 04, 2024                              https://wiki.debian.org/LTS
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Package        : netatalk
Version        : 3.1.12~ds-3+deb10u5
CVE ID         : CVE-2022-22995
Debian Bug     : 1053545

Corentin BAYET, Etienne HELLUY-LAFONT and Luca MORO of Synacktiv discovered a
symlink redirection vulnerability in Netatalk, the Apple Filing Protocol
service. The create_appledesktop_folder function of netatalk can be used to
unsafely move files outside the shared volume using the "mv" system utility.
The create_appledesktop_folder function is called when netatalk is configured
to use the legacy AppleDouble v2 format of file system meta data.

By using the features of another file sharing protocol, like SMB, an
attacker could abuse this primitive to create an arbitrary symbolic link
and move it outside the share. The attacker could then reuse the created
symlink to write arbitrary files on the targeted system. On the targeted
device where it was demonstrated, writing arbitrary files on the system
resulted in a remote code execution.

For Debian 10 buster, this problem has been fixed in version
3.1.12~ds-3+deb10u5.

We recommend that you upgrade your netatalk packages.

For the detailed security status of netatalk please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/netatalk

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS