mattercontrol

maintainer unlimitedbacon · 13 votes · scanned 2026-08-03 00:08:14.047287

MEDIUM

Why flagged The package downloads a prebuilt .deb binary from appspot.com (a Google App Engine host used by the MatterControl project as their distribution backend). While appspot.com is not the project's primary domain, MatterControl (by Matter Hackers) has historically used this as their actual download infrastructure, making this a semi-official host rather than a random personal server. However, the binary is a prebuilt executable (.deb containing Mono assemblies and native libraries) that gets unpacked and installed directly — this is a genuine supply-chain concern regardless of host legitimacy. The sha256sums are pinned, which mitigates substitution attacks significantly. The build token in the URL is opaque but the checksum provides integrity verification. Overall this is a medium-risk pattern: prebuilt binary from a non-primary-domain host, but with checksum pinning and a plausible legitimate origin. Not high because there is no obfuscation, no exfiltration, and the checksums are present.

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:24 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 package downloads a prebuilt .deb binary from appspot.com (a Google App Engine host used by the MatterControl project as their distribution backend). While appspot.com is not the project's primary domain, MatterControl (by Matter Hackers) has historically used this as their actual download infrastructure, making this a semi-official host rather than a random personal server. However, the binary is a prebuilt executable (.deb containing Mono assemblies and native libraries) that gets unpacked and installed directly — this is a genuine supply-chain concern regardless of host legitimacy. The sha256sums are pinned, which mitigates substitution attacks significantly. The build token in the URL is opaque but the checksum provides integrity verification. Overall this is a medium-risk pattern: prebuilt binary from a non-primary-domain host, but with checksum pinning and a plausible legitimate origin. Not high because there is no obfuscation, no exfiltration, and the checksums are present.

PKGBUILD

1 offending line(s) highlighted

      1# Maintainer: Tyler Anderson <unlimitedbacon@gmail.com>
    
      2
    
      3# This script simply downloads the MatterControl .deb release, unpacks it,
    
      4# and copies all necessary files.
    
      5
    
      6# To update the package, change pkgver and _buildtoken.
    
      7# Get _buildtoken from MCWS download URL.
    
      8# Afterwards, run updpkgsums and mksrcinfo.
    
      9
    
      10pkgname=mattercontrol
    
      11_pkgname=MatterControl
    
      12pkgver=2.19.10.10370
    
      13pkgrel=2
    
      14pkgdesc="Software solution for 3D printers"
    
      15arch=('any')
    
      16license=('custom')
    
      17url="http://www.mattercontrol.com"
    
      18depends=('mono' 'gtk-sharp-2')
    
      19provides=('mattercontrol')
    
      20conflicts=('mattercontrol-plugins')
    
      21install="mattercontrol.install"
    
      22_projecttoken=ag9zfm1hdHRlcmNvbnRyb2xyFAsSB1Byb2plY3QYgICAiOCSzAsM
    
      23_buildtoken=ag9zfm1hdHRlcmNvbnRyb2xyQQsSB1Byb2plY3QYgICAiOCSzAsMCxINUHVibGljUmVsZWFzZRiAgIDg1_GcCgwLEgZVcGxvYWQYgIDQiJunnQsM
    
      24source=("MatterControlSetup-$pkgver.deb::https://mattercontrol.appspot.com/downloads/development/$_buildtoken"
    
      25	'mattercontrol'
    
      26	'mattercontrol.desktop'
    
      27	'mattercontrol.png'
    
      28	'mattercontrol.install'
    
      29	'LICENSE')
    
      30sha256sums=('9f3163cb9b96c3a9803aec416ba28d51e5f6adcb88a07b585a23a8a0f60a1e9c'
    
      31            '4954c0de00d6701d37c15c73d3509d0d91e67339c08afa3b273e9343dfd5cc61'
    
      32            '89854894868127bdb8d7ebdef8cccf1c528b0a07e526380dcc0e1024a15c033c'
    
      33            '6470dfabd982109638c2e9fc01acca51dc1109ce07aec261dbc4c86ead9f9927'
    
      34            '41e907de000d6b57c7788229a36ff4b247de928597401631e2b1036fdf97aa77'
    
      35            '2731cdbc5d3916af68c1d5ffa2d3e3a3cfae6817ce5561d91f8bc565a3401982')
    
      36
    
      37build() {
    
      38        cd "${srcdir}"
    
      39        ar -x "MatterControlSetup-$pkgver.deb"
    
      40        tar -xvf data.tar.xz
    
      41}
    
      42
    
      43package() {
    
      44	cd "${srcdir}/usr/lib/mattercontrol"
    
      45	install -d "$pkgdir/usr/lib/mattercontrol/"
    
      46	cp -r * "$pkgdir/usr/lib/mattercontrol/"
    
      47
    
      48	cd "${srcdir}"
    
      49	install -Dm755 mattercontrol "$pkgdir/usr/bin/mattercontrol"
    
      50	install -Dm644 mattercontrol.desktop "$pkgdir/usr/share/applications/mattercontrol.desktop"
    
      51	install -Dm644 mattercontrol.png "$pkgdir/usr/share/icons/mattercontrol.png"
    
      52	install -Dm644 LICENSE "$pkgdir/usr/share/licenses/mattercontrol/LICENSE"
    
      53}
    
      54

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