circuitjs-bin

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

MEDIUM

Why flagged The PKGBUILD installs a prebuilt binary tarball (circuitjs1-linux64.tgz) from www.falstad.com, which is the official upstream vendor site for the Falstad Circuit Simulator — this is legitimate. However, two concerns remain: (1) The main binary source uses 'SKIP' for its sha256sum, meaning there is no integrity verification of the executed binary at all; if the upstream host is compromised or the file is swapped, there is no detection mechanism. (2) The icon is fetched from postimg.cc, a third-party image hosting service with no integrity guarantee beyond its sha256sum. The combination of an unverified prebuilt binary (SKIP checksum) installed to /opt and symlinked into /usr/bin constitutes a real supply-chain risk — not because the current content is malicious, but because the missing checksum means any future substitution of the binary would go undetected. This warrants a medium rating.

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:17 source=("https://www.falstad.com/circuit/offline/circuitjs1-linux64.tgz"
PKGBUILD:18 https://i.postimg.cc/Y0ZkBmDV/circuitjs.png

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 installs a prebuilt binary tarball (circuitjs1-linux64.tgz) from www.falstad.com, which is the official upstream vendor site for the Falstad Circuit Simulator — this is legitimate. However, two concerns remain: (1) The main binary source uses 'SKIP' for its sha256sum, meaning there is no integrity verification of the executed binary at all; if the upstream host is compromised or the file is swapped, there is no detection mechanism. (2) The icon is fetched from postimg.cc, a third-party image hosting service with no integrity guarantee beyond its sha256sum. The combination of an unverified prebuilt binary (SKIP checksum) installed to /opt and symlinked into /usr/bin constitutes a real supply-chain risk — not because the current content is malicious, but because the missing checksum means any future substitution of the binary would go undetected. This warrants a medium rating.

PKGBUILD

2 offending line(s) highlighted

      1# Maintainer: Ali Najafian <AliNajafian81@gmail.com>
    
      2pkgname=circuitjs-bin
    
      3pkgver=2.7.1
    
      4pkgrel=1
    
      5pkgdesc="Falstad Circuit Simulator for Linux. (Real and offline version)"
    
      6arch=(x86_64)
    
      7url="https://www.falstad.com/circuit/"
    
      8license=('GPL')
    
      9depends=()
    
      10makedepends=()
    
      11checkdepends=()
    
      12optdepends=()
    
      13provides=(circuitjs-bin)
    
      14conflicts=(circuitjs-bin)
    
      15options=(!strip)
    
      16
    
      17source=("https://www.falstad.com/circuit/offline/circuitjs1-linux64.tgz"
    
      18		  	https://i.postimg.cc/Y0ZkBmDV/circuitjs.png	  
    
      19		  	circuitjs.desktop)
    
      20sha256sums=('SKIP' 'b3ed46fb30478e7207a557658226be18ae1edacd1ee784cb2089e6eaa9a13716' 'e9cb7b4b74ff97f4a5da500bb7217d2796bbe21f2ed62508b391275adb1e3a14')
    
      21
    
      22
    
      23package() 
    
      24{
    
      25	cd $srcdir/circuitjs1
    
      26	echo packaging ${pkgname}
    
      27	install -d $pkgdir/opt/circuitjs/
    
      28	install -d ${pkgdir}/usr/bin
    
      29	cp -R "${srcdir}/circuitjs1/." "${pkgdir}/opt/circuitjs/"
    
      30	
    
      31	# create symlink from real opt to bin
    
      32	ln -s /opt/circuitjs/circuitjs1 "${pkgdir}"/usr/bin/circuitjs
    
      33	
    
      34	#integrate the desktop file
    
      35	install -d ${pkgdir}/usr/share/applications/
    
      36	install -m644 ${srcdir}/circuitjs.desktop ${pkgdir}/usr/share/applications/circuitjs.desktop
    
      37	
    
      38	#integrate icons...
    
      39   for res in 32 48 64 128 192 256 512; do
    
      40   	install -d $pkgdir/usr/share/icons/hicolor/${res}x${res}/apps
    
      41   	install -m644 ${srcdir}/circuitjs.png $pkgdir/usr/share/icons/hicolor/${res}x${res}/apps/circuitjs.png
    
      42   done
    
      43   
    
      44	echo done!
    
      45}
    
      46

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