lambda-tunnel

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

MEDIUM

Why flagged This PKGBUILD downloads a prebuilt binary (LT_Linux.zip containing the LT executable) from downloads.lambdatest.com, which is the official LambdaTest vendor download host. The binary is installed directly into /usr/bin/LT and executed (also used in pkgver()). The checksum is SKIP'd, meaning there is no integrity verification of the downloaded binary — if the host were compromised or the URL hijacked, an arbitrary binary would be installed and executed with user privileges. While lambdatest.com is a legitimate commercial service and this appears to be their official tunnel client, the combination of: (1) a prebuilt binary from a vendor host, (2) no checksum verification (SKIP), and (3) direct execution of that binary constitutes a genuine supply-chain risk. This is a textbook medium-severity concern: not clearly malicious, but a real code-execution risk from an unverified binary.

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:9 source=("https://downloads.lambdatest.com/tunnel/v3/linux/64bit/LT_Linux.zip"

MEDIUM AI review llm_review

An AI model (anthropic/claude-4.6-sonnet-20260217) reviewed this and agrees it is MEDIUM (confidence 85%): This PKGBUILD downloads a prebuilt binary (LT_Linux.zip containing the LT executable) from downloads.lambdatest.com, which is the official LambdaTest vendor download host. The binary is installed directly into /usr/bin/LT and executed (also used in pkgver()). The checksum is SKIP'd, meaning there is no integrity verification of the downloaded binary — if the host were compromised or the URL hijacked, an arbitrary binary would be installed and executed with user privileges. While lambdatest.com is a legitimate commercial service and this appears to be their official tunnel client, the combination of: (1) a prebuilt binary from a vendor host, (2) no checksum verification (SKIP), and (3) direct execution of that binary constitutes a genuine supply-chain risk. This is a textbook medium-severity concern: not clearly malicious, but a real code-execution risk from an unverified binary.

PKGBUILD

1 offending line(s) highlighted

      1# Maintainer: Carlos Marchal <carlos.marchal@pm.me>
    
      2pkgname=lambda-tunnel
    
      3pkgver=3.1.9
    
      4pkgrel=1
    
      5pkgdesc="Lambdatest tunnel for testing local sites"
    
      6arch=('x86_64')
    
      7url="https://www.lambdatest.com"
    
      8license=('unknown')
    
      9source=("https://downloads.lambdatest.com/tunnel/v3/linux/64bit/LT_Linux.zip"
    
      10	"lambda-tunnel.yaml"
    
      11	"lambda-tunnel.service")
    
      12
    
      13sha256sums=('SKIP'
    
      14	    '3091da011fe4b05211c8615818b9035e2e2b7800d73fd8125da01c68fb62346d'
    
      15	    'a8e9bef00c296c402e7d9f9e2d7368bfcee24c44c4d8a5e946c98ad9696dc321')
    
      16
    
      17pkgver() {
    
      18	./LT --version | sed 's/LT version //'
    
      19}
    
      20
    
      21package() {
    
      22	cd "$pkgdir"
    
      23	install -D -m755 "$srcdir"/LT usr/bin/LT
    
      24	install -D -m644 "$srcdir"/lambda-tunnel.yaml etc/lambda-tunnel.yaml
    
      25	install -D -m644 "$srcdir"/lambda-tunnel.service usr/lib/systemd/system/lambda-tunnel.service
    
      26}
    
      27

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