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Sun, 06 Jun 2021 08:52:01 -0400 Received: from debbugs.gnu.org ([209.51.188.43]:39407) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lpsG1-0000SG-Ob for bug-guix@gnu.org; Sun, 06 Jun 2021 08:52:01 -0400 Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lpsG1-0005Hk-Nm for bug-guix@gnu.org; Sun, 06 Jun 2021 08:52:01 -0400 X-Loop: help-debbugs@gnu.org Subject: bug#48872: Guix services: =?UTF-8?Q?=E2=80=98chmod=E2=80=99?= leaves opportunity to leak secrets Resent-From: Xinglu Chen Original-Sender: "Debbugs-submit" Resent-CC: bug-guix@gnu.org Resent-Date: Sun, 06 Jun 2021 12:52:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 48872 X-GNU-PR-Package: guix X-GNU-PR-Keywords: To: 48872@debbugs.gnu.org X-Debbugs-Original-To: bug-guix@gnu.org Received: via spool by submit@debbugs.gnu.org id=B.162298390620292 (code B ref -1); Sun, 06 Jun 2021 12:52:01 +0000 Received: (at submit) by debbugs.gnu.org; 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aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=yoctocell.xyz header.s=mail header.b=b8RDabci; spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Spam-Score: -3.43 Authentication-Results: aspmx1.migadu.com; dkim=fail ("headers rsa verify failed") header.d=yoctocell.xyz header.s=mail header.b=b8RDabci; dmarc=fail reason="SPF not aligned (relaxed)" header.from=yoctocell.xyz (policy=none); spf=pass (aspmx1.migadu.com: domain of bug-guix-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=bug-guix-bounces@gnu.org X-Migadu-Queue-Id: 5DF4312577 X-Spam-Score: -3.43 X-Migadu-Scanner: scn0.migadu.com X-TUID: 8kiFiuW37d3I --=-=-= Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable [ This was reported on the Nixpkgs bug tracker a few weeks ago ] When doing something like (call-with-output-file FILE (lambda (port) (display SECRET port))) (chmod FILE #o400) an unpriviliged user could open FILE before FILE had been chmod=E2=80=99ed,= and then read the contents of FILE. One solution to this problem would be to use (mkdir (dirname FILE) #o400) before writing SECRET to FILE. I have identified at least two services which are vulnerable to this: * =E2=80=98wireguard-service-type=E2=80=99 in (gnu services vpn) * =E2=80=98patchwork-service-type=E2=80=99 in (gnu servicse web) --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJJBAEBCAAzFiEEAVhh4yyK5+SEykIzrPUJmaL7XHkFAmC8xNgVHHB1YmxpY0B5 b2N0b2NlbGwueHl6AAoJEKz1CZmi+1x5thAQAL3qpee3wHvYmFD9wL480xx6V3Xe +4f7rNdr+6QgfwBpTZ3M2JNtLokNaDBVIAFnumSeCNTy7QrQgzbYbhrm9uh13nsy h0LaT7/R9hYZ3rm4SaSmuAO0Gm/mhCl5jtmdQjDozi4SbBZa0bp87QioZcbUC7p2 hKiB7CTrCu5WHtPC55RfRxq4X+s6X6dBM4PEgw9C5b28mvw6KMe9rFNC1r2u3jIH iXddPJxIZN9sjjBjO4EkRAtB5WGvfQLC+foPcnhNISvSKCtaonn4dQvgjeJ+0Qwc CQ0CpU/rQYt1KSFPvcvH1CtUI7a3j/J63kKInGm/U9vh386yFnuX0J787Q91AUW4 ZfrIH0b5cYjLW40Ro8yNvjviFLj8x4FZFfD/D2P3AsbBvmBwukSr1VFHaGbEawu4 gNyUciMUtW2NFly9w9wGHm5qS/kog9VrS64G1dsTa4MGqJzwYv+SvXj/uzyyO6cq vVPoT7VPeUUAjVUB08j08KmCVl/38xuBtHjr06B7DWMut+11TkqDga3iNLrdUaQS H/N2002yErF1ZOeGfl74+iRDHMg/F92epHmOGlLEh1VAEWWjj4lvF5nz41uFGz0y KSpx0ZrNPb+WABAUUj2EuQquxx22FeSgc4tZuKTrjJDd/nS+X6rheuL0cO0MvRnF uWTrfD4wGuEapukq =lgih -----END PGP SIGNATURE----- --=-=-=--