231479 CVE-2021-42762 2021-10-09 11:39:13 -0700 [WPE][GTK] Limited sandbox escape via VFS syscalls 2024-03-20 10:51:57 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Nightly Build PC Linux RESOLVED FIXED InRadar P2 Normal --- 1 mcatanzaro webkit-unassigned anonymousert2120+1 aperez bfulgham bugs-noreply cgarcia clopez ews-feeder mcatanzaro pgriffis product-security webkit-bug-importer oldest_to_newest 1802396 0 mcatanzaro 2021-10-09 11:39:13 -0700 Flatpak just disclosed a nice zero day in our sandbox: https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q There is a massive warning comment in flatpak-run.c to make sure anyone editing their seccomp filters knows they need to coordinate with other projects that share the same filters before disclosing vulnerabilities, but... well, it didn't happen. Oh well. To prevent this from happening again, we need to split the affected code out of flatpak so that it becomes more obvious that it is shared with multiple projects: https://github.com/flatpak/flatpak/issues/4466. Anyway, the problem is the web process can delete the .flatpak-info file that we create in the root of its filesystem namespace. That's not intended, and we do need to request a CVE (I'll do this next week), but it's probably not the end of the world either, as nobody seems to be able to immediately think of anything that could directly go wrong. Certainly it's not a normal full sandbox escape. The web process doesn't have direct D-Bus access, so it can't talk directly to desktop portals -- those look for .flatpak-info in the filesystem namespace of the xdg-dbus-proxy process, which is trusted -- so the badness seems to be limited to communication via Unix sockets that are mounted inside the sandbox, which hopefully do not trust their peers anyway. That said, we do need to address this by copying the recent changes to flatpak's sandbox filters into WebKit. We also need to stay tuned to future changes to the flatpak filters. 1802397 1 webkit-bug-importer 2021-10-09 11:39:24 -0700 <rdar://problem/84064163> 1802684 2 440804 mcatanzaro 2021-10-11 10:27:16 -0700 Created attachment 440804 Patch 1802738 3 pgriffis 2021-10-11 12:25:42 -0700 Where and how is Syscalls.h used? Maybe I missed it. 1802749 4 440804 mcatanzaro 2021-10-11 12:44:07 -0700 Comment on attachment 440804 Patch It's used by SCMP_SYS. I found its definition in seccomp.h: #define SCMP_SYS(x) (__SNR_##x) 1802753 5 440804 mcatanzaro 2021-10-11 12:45:59 -0700 Comment on attachment 440804 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=440804&action=review > Source/WebKit/UIProcess/Launcher/glib/BubblewrapLauncher.cpp:737 > + { SCMP_SYS(clone3), ENOSYS, nullptr }, E.g. this line here... > Source/WebKit/UIProcess/Launcher/glib/Syscalls.h:114 > +#ifndef __SNR_clone3 > +# define __SNR_clone3 __NR_clone3 > +#endif ...might depend on this definition here. 1804807 6 mcatanzaro 2021-10-15 08:09:25 -0700 Ping reviewers 1805746 7 440804 aperez 2021-10-18 15:48:52 -0700 Comment on attachment 440804 Patch Seccomp is about the worst possible ever design for such a feature (for comparison, check pledge/unveil in OpenBSD and marvel!), but we have no other remedy than to live with it 🤷‍♂️️ 1805983 8 ews-feeder 2021-10-19 07:27:26 -0700 Committed r284451 (243211@main): <https://commits.webkit.org/243211@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 440804. 1806005 9 mcatanzaro 2021-10-19 08:04:34 -0700 I've requested a CVE. 1806784 10 mcatanzaro 2021-10-20 12:48:37 -0700 We received CVE-2021-42762. 440804 2021-10-11 10:27:16 -0700 2021-10-19 07:27:29 -0700 Patch bug-231479-20211011122715.patch text/plain 16290 mcatanzaro U3VidmVyc2lvbiBSZXZpc2lvbjogMjgzODk1CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDIyM2U4NDQyMzRiMmE0ZGIy NjlkNmNiZjkxY2Q1ZTE2NGRmYzg4YjkuLmEyOWE0MzVhZjYyZDkwYmY2N2NhYjU4ZjdlMmQ2YzBh ZGRkN2U1YTcgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMjEgQEAKKzIwMjEtMTAtMTEgIE1pY2hhZWwg Q2F0YW56YXJvICA8bWNhdGFuemFyb0Bnbm9tZS5vcmc+CisKKyAgICAgICAgVXBkYXRlIHNlY2Nv bXAgZmlsdGVycyB3aXRoIGxhdGVzdCBjaGFuZ2VzIGZyb20gZmxhdHBhaworICAgICAgICBodHRw czovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjMxNDc5CisKKyAgICAgICAgUmV2 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