after-school

maintainer dcelasun · 1 votes · scanned 2026-08-03 00:08:14.047287

MEDIUM

Why flagged The PKGBUILD downloads a prebuilt game binary (AfterSchool.x86) at build time via a dynamically constructed URL fetched from itch.io, with no checksum verification. The binary is then installed as an executable. This is a genuine supply-chain concern: the download URL is resolved at package() time rather than declared in source=(), meaning makepkg's integrity checking is completely bypassed. The itch.io CDN URL could change or be substituted without any detection. While itch.io is a legitimate game distribution platform and the game appears to be a real indie title, the pattern of fetching and executing an unverified binary from a dynamically resolved URL is a real medium-severity supply-chain risk — not a false positive.

Triggered rules

MEDIUM External download from an untrusted host, not in source=() external_download_not_in_source

curl/wget fetches a URL on a non-allowlisted host that is not part of source=(), so it is not checksum-verified by makepkg.

PKGBUILD:18 game_url=$(curl -s -XPOST "https://ateliersento.itch.io/after-school/file/125815?after_download_lightbox=true" | grep -Po '"url":.*?[^\\]",' | cut -c8- | rev |cut -c3- | rev | sed 's/\\\//\//g')

MEDIUM AI review llm_review

An AI model (anthropic/claude-4.6-sonnet-20260217) reviewed this and agrees it is MEDIUM (confidence 85%): The PKGBUILD downloads a prebuilt game binary (AfterSchool.x86) at build time via a dynamically constructed URL fetched from itch.io, with no checksum verification. The binary is then installed as an executable. This is a genuine supply-chain concern: the download URL is resolved at package() time rather than declared in source=(), meaning makepkg's integrity checking is completely bypassed. The itch.io CDN URL could change or be substituted without any detection. While itch.io is a legitimate game distribution platform and the game appears to be a real indie title, the pattern of fetching and executing an unverified binary from a dynamically resolved URL is a real medium-severity supply-chain risk — not a false positive.

PKGBUILD

1 offending line(s) highlighted

      1# Maintainer: Can Celasun <can[at]dcc[dot]im>
    
      2pkgname=after-school
    
      3pkgver=1
    
      4pkgrel=2
    
      5pkgdesc="After School is a short videogame entirely handpainted on paper, using pencils and watercolors."
    
      6arch=(i686 x86_64)
    
      7url="https://ateliersento.itch.io/after-school"
    
      8license=('custom')
    
      9depends=(lib32-libgl lib32-gdk-pixbuf2 lib32-libxcursor lib32-libxrandr)
    
      10makedepends=(unzip)
    
      11source=(after-school.desktop
    
      12        after-school.png)
    
      13md5sums=('27d65a6caf3d071c04ff0fe4753d327d'
    
      14         '6b30fc39b12b080053f8063d51b76e70')
    
      15package() {
    
      16  cd "${srcdir}"
    
      17  # Hacky way to get the actual download URL
    
      18  game_url=$(curl -s -XPOST "https://ateliersento.itch.io/after-school/file/125815?after_download_lightbox=true" | grep -Po '"url":.*?[^\\]",' | cut -c8- | rev |cut -c3- | rev | sed 's/\\\//\//g')
    
      19  curl -o after_school.zip ${game_url}
    
      20  unzip -o after_school.zip
    
      21  
    
      22  mkdir -p "${pkgdir}"/usr/bin
    
      23  mkdir -p "${pkgdir}"/usr/share/${pkgname}
    
      24  mkdir -p "${pkgdir}"/usr/share/{applications,icons}
    
      25
    
      26  cp "${srcdir}"/AfterSchool* "${pkgdir}"/usr/share/${pkgname} -R
    
      27
    
      28  install -m755 "${srcdir}"/AfterSchool.x86 "${pkgdir}"/usr/share/${pkgname}/AfterSchool
    
      29  
    
      30  find "${pkgdir}/usr/share/${pkgname}" -type d -exec chmod 755 "{}" \;
    
      31  find "${pkgdir}/usr/share/${pkgname}" -type f -exec chmod 644 "{}" \;
    
      32
    
      33  install -m644 "${srcdir}"/${pkgname}.png "${pkgdir}"/usr/share/icons
    
      34  install -m644 "${srcdir}"/${pkgname}.desktop "${pkgdir}"/usr/share/applications
    
      35
    
      36  chmod +x "${pkgdir}"/usr/share/${pkgname}/AfterSchool
    
      37
    
      38  ln -s /usr/share/${pkgname}/AfterSchool "${pkgdir}"/usr/bin/${pkgname}
    
      39}
    
      40

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