mattercontrol-plugins

MEDIUM

maintainer unlimitedbacon 2 votes scanned 2026-09-17 00:27:14.276658

View on AUR

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
2026-09-17 00:27:14	Medium	2
2026-09-16 00:03:17	Medium	2
2026-09-15 00:25:31	Medium	2
2026-09-14 00:27:57	Medium	2
2026-09-13 00:19:54	Medium	2
2026-09-12 00:25:17	Medium	2
2026-09-11 00:19:22	Medium	2
2026-09-10 00:22:44	Medium	2
2026-09-09 00:04:09	Medium	2
2026-09-08 00:18:08	Medium	2
2026-09-07 00:30:15	Medium	2
2026-09-06 00:17:06	Medium	2
2026-09-05 00:16:27	Medium	2
2026-09-04 00:03:13	Medium	2
2026-09-03 00:15:47	Medium	2
2026-09-02 00:02:31	Medium	2
2026-09-01 00:11:19	Medium	2
2026-08-31 00:19:57	Medium	2
2026-08-30 00:04:14	Medium	2
2026-08-29 00:29:17	Medium	2