noi_arbiter-bin

maintainer zhangsiqi7559 · 2 votes · scanned 2026-08-03 00:08:14.047287

MEDIUM

Why flagged The PKGBUILD downloads and installs a prebuilt binary ('arbiter_local') from 'oj.zigao.info', which is not the official NOI/CCF infrastructure (noi.cn). The binary is installed with execute permissions (Dm755) directly into /usr/bin. While a sha256sum is provided (offering some integrity protection), the hash only guarantees the file hasn't changed since the PKGBUILD was written — it does not establish that the binary is trustworthy or unmodified from the official CCF release. The official URL points to noi.cn but the actual binary comes from a third-party personal/unofficial host. Additionally, arbiter-filter is pulled from GitHub (wxt1221/arbiter-filter) with SKIP checksum and also installed with execute permissions. The combination of an unverifiable prebuilt binary from a non-official host plus a GitHub repo with skipped checksum constitutes a genuine supply-chain risk, consistent with 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:8 source=("https://oj.zigao.info/arbiter_local" "arbiter_local.png" "git+https://github.com/wxt1221/arbiter-filter" "run.sh" "arbiter.desktop")

MEDIUM Recently orphaned & re-adopted orphaned_readopted

This package was orphaned and re-adopted within the last 30 days — a window where ownership transfers can introduce malicious changes.

MEDIUM AI review llm_review

An AI model (anthropic/claude-4.6-sonnet-20260217) reviewed this and agrees it is MEDIUM (confidence 82%): The PKGBUILD downloads and installs a prebuilt binary ('arbiter_local') from 'oj.zigao.info', which is not the official NOI/CCF infrastructure (noi.cn). The binary is installed with execute permissions (Dm755) directly into /usr/bin. While a sha256sum is provided (offering some integrity protection), the hash only guarantees the file hasn't changed since the PKGBUILD was written — it does not establish that the binary is trustworthy or unmodified from the official CCF release. The official URL points to noi.cn but the actual binary comes from a third-party personal/unofficial host. Additionally, arbiter-filter is pulled from GitHub (wxt1221/arbiter-filter) with SKIP checksum and also installed with execute permissions. The combination of an unverifiable prebuilt binary from a non-official host plus a GitHub repo with skipped checksum constitutes a genuine supply-chain risk, consistent with a MEDIUM rating.

PKGBUILD

1 offending line(s) highlighted

      1pkgname=noi_arbiter-bin
    
      2_ver=2.0
    
      3pkgver=${_ver}
    
      4pkgrel=1
    
      5pkgdesc="Arbiter is used to judge problems in NOI. Written by CCF."
    
      6arch=('x86_64')
    
      7url="https://www.noi.cn/gynoi/jsgz/2021-07-16/732450.shtml"
    
      8source=("https://oj.zigao.info/arbiter_local" "arbiter_local.png" "git+https://github.com/wxt1221/arbiter-filter" "run.sh" "arbiter.desktop")
    
      9sha256sums=("5bf81bbac150ca7feb37bcb5cb9789cb4affa37b8745d2f32e7bee246c37c83f"
    
      10	    "d74bbf3e6b4cc23bc61e4ac2826659e1fc40b9f812b7eb5e0ea65bc9c6ff6f9a"
    
      11	    "SKIP"
    
      12	    "e4c0d030a8439597897fa87e29fc730e527efc0f799c4f3faabde5ab6a117cc9"
    
      13	    "b7461be4a8bdfc02cf7d60471a267419698f7d8f7a5559327b3f037f66e4dd14")
    
      14package(){
    
      15	install -Dm755 "arbiter_local" "${pkgdir}/usr/bin/${pkgname}2/${pkgname}"
    
      16	install -Dm644 "arbiter.desktop" "${pkgdir}/usr/share/applications/${pkgname}.desktop"
    
      17	install -Dm755 "arbiter_local.png" "${pkgdir}/usr/share/icons/hicolor/48x48/apps/${pkgname}.png"
    
      18	mkdir ${pkgdir}/usr/bin/${pkgname}2/filter/
    
      19	cp -rf arbiter-filter/* ${pkgdir}/usr/bin/${pkgname}2/filter/
    
      20	chmod 755 ${pkgdir}/usr/bin/${pkgname}2/filter/*
    
      21	install -Dm755 "run.sh" "${pkgdir}/usr/bin/${pkgname}" 
    
      22}
    
      23

Scan history

Scanned at (UTC)	Severity	Rules
2026-08-03 00:08:14	MEDIUM	3
2026-08-02 00:16:08	MEDIUM	3
2026-08-01 00:11:18	MEDIUM	3
2026-07-31 00:14:10	MEDIUM	3
2026-07-30 00:17:23	MEDIUM	3
2026-07-29 00:25:53	MEDIUM	3
2026-07-28 00:07:28	MEDIUM	3
2026-07-27 00:24:32	MEDIUM	3
2026-07-26 00:07:32	MEDIUM	3
2026-07-25 00:13:44	MEDIUM	3
2026-07-24 00:02:28	MEDIUM	3
2026-07-23 00:14:47	MEDIUM	3
2026-07-22 00:29:32	MEDIUM	3
2026-07-21 00:24:15	MEDIUM	3
2026-07-20 00:19:49	MEDIUM	3
2026-07-19 00:17:08	MEDIUM	3
2026-07-18 00:14:48	MEDIUM	3
2026-07-17 00:06:16	MEDIUM	3
2026-07-16 00:05:41	MEDIUM	2
2026-07-15 00:09:25	MEDIUM	2