mattercontrol-plugins

maintainer unlimitedbacon · 2 votes · scanned 2026-08-03 00:08:14.047287

MEDIUM

Why flagged The PKGBUILD downloads a prebuilt .deb from appspot.com (Google App Engine), which is the official MatterControl distribution endpoint used by the upstream project. The long token in the URL is a standard App Engine blobstore key, not a hidden backdoor. However, the source is a closed-source binary blob (multiple .dll files) extracted from a .deb and installed as executable code. The sha256sum is pinned, which mitigates silent replacement, but the binaries are unauditable closed-source DLLs from a personal/project App Engine instance rather than a well-known official release channel. This is a genuine medium-severity supply-chain concern: prebuilt, unauditable, closed-source binaries executed at runtime, sourced from a non-standard host. The risk is real but not clearly malicious — it matches the AUR's own definition of a medium concern.

Triggered rules

MEDIUM source=() URL on a non-standard host source_untrusted_domain

One or more source=() URLs point to a host outside the trusted allowlist (github.com, gitlab.com, codeberg.org, pypi.org, …).

PKGBUILD:14 source=("MatterControlSetup-$pkgver.deb::https://mattercontrol.appspot.com/downloads/development/$_buildtoken")

MEDIUM AI review llm_review

An AI model (anthropic/claude-4.6-sonnet-20260217) reviewed this and agrees it is MEDIUM (confidence 72%): The PKGBUILD downloads a prebuilt .deb from appspot.com (Google App Engine), which is the official MatterControl distribution endpoint used by the upstream project. The long token in the URL is a standard App Engine blobstore key, not a hidden backdoor. However, the source is a closed-source binary blob (multiple .dll files) extracted from a .deb and installed as executable code. The sha256sum is pinned, which mitigates silent replacement, but the binaries are unauditable closed-source DLLs from a personal/project App Engine instance rather than a well-known official release channel. This is a genuine medium-severity supply-chain concern: prebuilt, unauditable, closed-source binaries executed at runtime, sourced from a non-standard host. The risk is real but not clearly malicious — it matches the AUR's own definition of a medium concern.

PKGBUILD

1 offending line(s) highlighted

      1# Maintainer: Tyler Anderson <unlimitedbacon@gmail.com>
    
      2
    
      3pkgname=mattercontrol-plugins
    
      4_pkgname=MatterControl
    
      5pkgver=1.7.5
    
      6pkgrel=1
    
      7pkgdesc="Closed source plugins for MatterControl"
    
      8arch=("i386" "x86_64")
    
      9license=('custom')
    
      10url="http://www.mattercontrol.com"
    
      11depends=('mattercontrol')
    
      12provides=('mattercontrol-plugins')
    
      13_buildtoken="ag9zfm1hdHRlcmNvbnRyb2xyQQsSB1Byb2plY3QYgICAiOCSzAsMCxINUHVibGljUmVsZWFzZRiAgIDg8dSdCgwLEgZVcGxvYWQYgICA4NfmjQoM"
    
      14source=("MatterControlSetup-$pkgver.deb::https://mattercontrol.appspot.com/downloads/development/$_buildtoken")
    
      15sha256sums=('1e594c239a657ef9d92caa56b34c696910055913b71ef64a05ec1fb8830a084b')
    
      16
    
      17build() {
    
      18	cd "${srcdir}"
    
      19	ar -x "MatterControlSetup-$pkgver.deb"
    
      20	tar -xvf data.tar.xz
    
      21}
    
      22
    
      23package() {
    
      24	cd "${srcdir}/usr/lib/mattercontrol"
    
      25	install -d "$pkgdir/usr/lib/mattercontrol/"
    
      26
    
      27	# Plugins
    
      28	cp CloudServices.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      29	cp MarlinFirmwareUpdatePlugin.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      30	cp MatterControlAuth.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      31	cp Mono.Nat.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      32	cp PictureCreator.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      33	cp PrintNotifications.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      34	cp TcpipDriver.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      35	cp X3GDriver.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      36
    
      37	# Libraries
    
      38	cp EngineIoClientDotNet.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      39	cp SocketIoClientDotNet.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      40	cp WebSocket4Net.dll* "$pkgdir/usr/lib/mattercontrol/"
    
      41
    
      42}
    
      43

Scan history

Scanned at (UTC)	Severity	Rules
2026-08-03 00:08:14	MEDIUM	2
2026-08-02 00:16:08	MEDIUM	2
2026-08-01 00:11:18	MEDIUM	2
2026-07-31 00:14:10	MEDIUM	2
2026-07-30 00:17:23	MEDIUM	2
2026-07-29 00:25:53	MEDIUM	2
2026-07-28 00:07:28	MEDIUM	2
2026-07-27 00:24:32	MEDIUM	2
2026-07-26 00:07:32	MEDIUM	2
2026-07-25 00:13:44	MEDIUM	2
2026-07-24 00:02:28	MEDIUM	2
2026-07-23 00:14:47	MEDIUM	2
2026-07-22 00:29:32	MEDIUM	2
2026-07-21 00:24:15	MEDIUM	2
2026-07-20 00:19:49	MEDIUM	2
2026-07-19 00:17:08	MEDIUM	2
2026-07-18 00:14:48	MEDIUM	2
2026-07-17 00:06:16	MEDIUM	2
2026-07-16 00:05:41	MEDIUM	2
2026-07-15 00:09:25	MEDIUM	2