CVSS: 8.6EPSS: 0%CPEs: 7EXPL: 0CVE-2021-43860 – Permissions granted to applications can be hidden from the user at install time
https://notcve.org/view.php?id=CVE-2021-43860
Flatpak is a Linux application sandboxing and distribution framework. Prior to versions 1.12.3 and 1.10.6, Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user. Flatpak shows permissions to the user during install by reading them from the "xa.metadata" key in the commit metadata. This cannot contain a null terminator, because it is an untrusted GVariant. • https://github.com/flatpak/flatpak/commit/54ec1a482dfc668127eaae57f135e6a8e0bc52da https://github.com/flatpak/flatpak/commit/65cbfac982cb1c83993a9e19aa424daee8e9f042 https://github.com/flatpak/flatpak/commit/93357d357119093804df05acc32ff335839c6451 https://github.com/flatpak/flatpak/commit/ba818f504c926baaf6e362be8159cfacf994310e https://github.com/flatpak/flatpak/commit/d9a8f9d8ccc0b7c1135d0ecde006a75d25f66aee https://github.com/flatpak/flatpak/releases/tag/1.10.6 https://github.com/flatpak/flatpak/releases/tag/1.12.3 https://github.com/flatpak/ • CWE-269: Improper Privilege Management CWE-276: Incorrect Default Permissions •
CVSS: 8.8EPSS: 0%CPEs: 6EXPL: 0CVE-2021-41133 – Sandbox bypass via recent VFS-manipulating syscalls
https://notcve.org/view.php?id=CVE-2021-41133
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak's denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. • http://www.openwall.com/lists/oss-security/2021/10/26/9 https://github.com/flatpak/flatpak/commit/1330662f33a55e88bfe18e76de28b7922d91a999 https://github.com/flatpak/flatpak/commit/26b12484eb8a6219b9e7aa287b298a894b2f34ca https://github.com/flatpak/flatpak/commit/462fca2c666e0cd2b60d6d2593a7216a83047aaf https://github.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36 https://github.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48 https://github.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69f https://github.c • CWE-20: Improper Input Validation •
CVSS: 8.2EPSS: 0%CPEs: 4EXPL: 0CVE-2021-21381 – Sandbox escape via special tokens in .desktop file
https://notcve.org/view.php?id=CVE-2021-21381
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In Flatpack since version 0.9.4 and before version 1.10.2 has a vulnerability in the "file forwarding" feature which can be used by an attacker to gain access to files that would not ordinarily be allowed by the app's permissions. By putting the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak app's .desktop file, a malicious app publisher can trick flatpak into behaving as though the user had chosen to open a target file with their Flatpak app, which automatically makes that file available to the Flatpak app. This is fixed in version 1.10.2. A minimal solution is the first commit "`Disallow @@ and @@U usage in desktop files`". • https://github.com/flatpak/flatpak/commit/8279c5818425b6812523e3805bbe242fb6a5d961 https://github.com/flatpak/flatpak/commit/a7401e638bf0c03102039e216ab1081922f140ae https://github.com/flatpak/flatpak/commit/eb7946bb6248923d8c90fe9b84425fef97ae580d https://github.com/flatpak/flatpak/pull/4156 https://github.com/flatpak/flatpak/releases/tag/1.10.2 https://github.com/flatpak/flatpak/security/advisories/GHSA-xgh4-387p-hqpp https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MXXLXC2DPJ45HSMTI5MZYHMYEGQN6AA&# • CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE-284: Improper Access Control •
CVSS: 8.8EPSS: 0%CPEs: 3EXPL: 0CVE-2021-21261 – Flatpak sandbox escape via spawn portal
https://notcve.org/view.php?id=CVE-2021-21261
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the `flatpak-portal` service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.10.0. The Flatpak portal D-Bus service (`flatpak-portal`, also known by its D-Bus service name `org.freedesktop.portal.Flatpak`) allows apps in a Flatpak sandbox to launch their own subprocesses in a new sandbox instance, either with the same security settings as the caller or with more restrictive security settings. For example, this is used in Flatpak-packaged web browsers such as Chromium to launch subprocesses that will process untrusted web content, and give those subprocesses a more restrictive sandbox than the browser itself. • https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486 https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4 https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba https://github.com/flatpak/flatpak/releases/tag/1.8.5 https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2 https://security.gentoo.org/glsa/202101-21 https://www.debian.org/security/2021/ • CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') •
CVSS: 9.0EPSS: 0%CPEs: 4EXPL: 0CVE-2019-10063 – flatpak: Sandbox bypass via IOCSTI (incomplete fix for CVE-2017-5226)
https://notcve.org/view.php?id=CVE-2019-10063
Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1 allows a sandbox bypass. Flatpak versions since 0.8.1 address CVE-2017-5226 by using a seccomp filter to prevent sandboxed apps from using the TIOCSTI ioctl, which could otherwise be used to inject commands into the controlling terminal so that they would be executed outside the sandbox after the sandboxed app exits. This fix was incomplete: on 64-bit platforms, the seccomp filter could be bypassed by an ioctl request number that has TIOCSTI in its 32 least significant bits and an arbitrary nonzero value in its 32 most significant bits, which the Linux kernel would treat as equivalent to TIOCSTI. Flatpak, en versiones anteriores a la 1.0.8, 1.1.x y 1.2.x anteriores a la 1.2.4, y en las versiones 1.3.x anteriores a la 1.3.1, permite omitir el sandbox. Las versiones de Flatpak desde la 0.8.1 abordan CVE-2017-5226 mediante un filtro seccomp para evitar que las aplicaciones del sandbox empleen el ioctl TIOCSTI, que podría emplearse para inyectar comandos en la terminal de control para que se ejecuten fuera del sandbox una vez la aplicación en el sandbox se cierra. • https://access.redhat.com/errata/RHSA-2019:1024 https://access.redhat.com/errata/RHSA-2019:1143 https://github.com/flatpak/flatpak/issues/2782 https://access.redhat.com/security/cve/CVE-2019-10063 https://bugzilla.redhat.com/show_bug.cgi?id=1695973 • CWE-20: Improper Input Validation CWE-266: Incorrect Privilege Assignment •