kontur-talk

MEDIUM

maintainer lonelion 7 votes scanned 2026-09-17 00:27:14.276658

View on AUR

Why flagged

The PKGBUILD downloads and installs a prebuilt proprietary binary .deb package from st.ktalk.host, which is a subdomain associated with Kontur Talk (ktalk), a Russian enterprise video conferencing product by SKB Kontur. The domain is plausibly the official distribution host for this software (ktalk = Kontur Talk, st = static/storage), and the URL pattern matches what one would expect from a vendor CDN. However, it is not a well-known public forge or package registry, there is no GPG signature verification, and the only integrity check is a single sha256sum. The binary is extracted and installed directly into the system (Electron-based app given the gtk3/nss/libxtst deps). This is a classic medium-risk pattern: a closed-source prebuilt binary from a vendor-controlled but unverifiable host, with no signature chain. If the host were compromised or the maintainer updates the hash to a malicious binary, arbitrary code execution would result. Not clearly malicious, but a genuine supply-chain concern warranting medium severity.

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:13 source=("https://st.ktalk.host/ktalk-app/linux/ktalk${pkgver}amd64.deb")

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 downloads and installs a prebuilt proprietary binary .deb package from st.ktalk.host, which is a subdomain associated with Kontur Talk (ktalk), a Russian enterprise video conferencing product by SKB Kontur. The domain is plausibly the official distribution host for this software (ktalk = Kontur Talk, st = static/storage), and the URL pattern matches what one would expect from a vendor CDN. However, it is not a well-known public forge or package registry, there is no GPG signature verification, and the only integrity check is a single sha256sum. The binary is extracted and installed directly into the system (Electron-based app given the gtk3/nss/libxtst deps). This is a classic medium-risk pattern: a closed-source prebuilt binary from a vendor-controlled but unverifiable host, with no signature chain. If the host were compromised or the maintainer updates the hash to a malicious binary, arbitrary code execution would result. Not clearly malicious, but a genuine supply-chain concern warranting medium severity.

PKGBUILD

1 offending line(s) highlighted

      1# Maintainer: Yaroslav de la Peña Smirnov <yps@yaroslavps.com>
    
      2
    
      3pkgname=kontur-talk
    
      4pkgver=3.6.0
    
      5pkgrel=1
    
      6pkgdesc="Enterprise video conferencing client app"
    
      7arch=('x86_64')
    
      8url="https://kontur.ru/talk"
    
      9license=('custom')
    
      10makedepends=('wget' 'tar')
    
      11depends=('gtk3' 'nss' 'libxtst' 'xdg-utils' 'util-linux-libs')
    
      12provides=('kontur-talk')
    
      13source=("https://st.ktalk.host/ktalk-app/linux/ktalk${pkgver}amd64.deb")
    
      14sha256sums=('f18196e1b5f593d1feb434873465ec326a793e1277ce396ace629664dde710ca')
    
      15
    
      16package() {
    
      17	ar -x "${srcdir}/ktalk${pkgver}amd64.deb" data.tar.xz
    
      18	tar -xJf data.tar.xz -C "${pkgdir}/"
    
      19}
    
      20

Scan history

Scanned at (UTC)	Severity	Rules
2026-09-17 00:27:14	Medium	2
2026-09-16 00:03:17	Medium	2
2026-09-15 00:25:31	Medium	2
2026-09-14 00:27:57	Medium	2
2026-09-13 00:19:54	Medium	2
2026-09-12 00:25:17	Medium	2
2026-09-11 00:19:22	Medium	2
2026-09-10 00:22:44	Medium	2
2026-09-09 00:04:09	Medium	2
2026-09-08 00:18:08	Medium	2
2026-09-07 00:30:15	Medium	2
2026-09-06 00:17:06	Medium	2
2026-09-05 00:16:27	Medium	2
2026-09-04 00:03:13	Medium	2
2026-09-03 00:15:47	Medium	2
2026-09-02 00:02:31	Medium	2
2026-09-01 00:11:19	Medium	2
2026-08-31 00:19:57	Medium	2
2026-08-30 00:04:14	Medium	2
2026-08-29 00:29:17	Medium	2