CVE-2021-31439

Name	CVE-2021-31439
Description	This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Synology DiskStation Manager. Authentication is not required to exploit this vulnerablity. The specific flaw exists within the processing of DSI structures in Netatalk. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-12326.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3426-1, DSA-5503-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
netatalk (PTS)	stretch (security), stretch (lts), stretch	2.2.5-2+deb9u1	vulnerable
	buster (security), buster, buster (lts)	3.1.12~ds-3+deb10u5	fixed
	bullseye (security), bullseye	3.1.12~ds-8+deb11u1	fixed
	sid, trixie	4.0.3~ds-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin
netatalk	source	stretch	(unfixed)	end-of-life
netatalk	source	buster	3.1.12~ds-3+deb10u1		DLA-3426-1
netatalk	source	bullseye	3.1.12~ds-8+deb11u1		DSA-5503-1
netatalk	source	(unstable)	3.1.13~ds-1

https://netatalk.sourceforge.io/3.1/ReleaseNotes3.1.13.html
https://github.com/Netatalk/Netatalk/commit/779717df2ed39b701deaf2472b42d59ff50fab7f