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{
"CVE_data_meta" : {
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"ASSIGNER" : "security-advisories@github.com" ,
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"ID" : "CVE-2021-41133" ,
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"STATE" : "PUBLIC" ,
"TITLE" : "Sandbox bypass via recent VFS-manipulating syscalls"
} ,
"affects" : {
"vendor" : {
"vendor_data" : [
{
"product" : {
"product_data" : [
{
"product_name" : "flatpak" ,
"version" : {
"version_data" : [
{
"version_value" : ">= 1.8.0, <= 1.8.2"
} ,
{
"version_value" : ">= 1.10.0, < 1.10.4"
} ,
{
"version_value" : ">= 1.11.0, < 1.12.0"
}
]
}
}
]
} ,
"vendor_name" : "flatpak"
}
]
}
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} ,
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"data_format" : "MITRE" ,
"data_type" : "CVE" ,
"data_version" : "4.0" ,
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"description" : {
"description_data" : [
{
"lang" : "eng" ,
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"value" : "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. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version."
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}
]
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} ,
"impact" : {
"cvss" : {
"attackComplexity" : "LOW" ,
"attackVector" : "LOCAL" ,
"availabilityImpact" : "HIGH" ,
"baseScore" : 8.8 ,
"baseSeverity" : "HIGH" ,
"confidentialityImpact" : "HIGH" ,
"integrityImpact" : "HIGH" ,
"privilegesRequired" : "LOW" ,
"scope" : "CHANGED" ,
"userInteraction" : "NONE" ,
"vectorString" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H" ,
"version" : "3.1"
}
} ,
"problemtype" : {
"problemtype_data" : [
{
"description" : [
{
"lang" : "eng" ,
"value" : "CWE-20: Improper Input Validation"
}
]
}
]
} ,
"references" : {
"reference_data" : [
{
"name" : "https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q" ,
"refsource" : "CONFIRM" ,
"url" : "https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/1330662f33a55e88bfe18e76de28b7922d91a999" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/1330662f33a55e88bfe18e76de28b7922d91a999"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/26b12484eb8a6219b9e7aa287b298a894b2f34ca" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/26b12484eb8a6219b9e7aa287b298a894b2f34ca"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/462fca2c666e0cd2b60d6d2593a7216a83047aaf" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/462fca2c666e0cd2b60d6d2593a7216a83047aaf"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/4c34815784e9ffda5733225c7d95824f96375e36"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/89ae9fe74c6d445bb1b3a40e568d77cf5de47e48"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69f" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/9766ee05b1425db397d2cf23afd24c7f6146a69f"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/a10f52a7565c549612c92b8e736a6698a53db330"
} ,
{
"name" : "https://github.com/flatpak/flatpak/commit/e26ac7586c392b5eb35ff4609fe232c52523b2cf" ,
"refsource" : "MISC" ,
"url" : "https://github.com/flatpak/flatpak/commit/e26ac7586c392b5eb35ff4609fe232c52523b2cf"
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} ,
{
"refsource" : "FEDORA" ,
"name" : "FEDORA-2021-4b201d15e6" ,
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R5656ONDP2MGKIJMKEC7N2NXCV27WGTC/"
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} ,
{
"refsource" : "DEBIAN" ,
"name" : "DSA-4984" ,
"url" : "https://www.debian.org/security/2021/dsa-4984"
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} ,
{
"refsource" : "MLIST" ,
"name" : "[oss-security] 20211026 WebKitGTK and WPE WebKit Security Advisory WSA-2021-0006" ,
"url" : "http://www.openwall.com/lists/oss-security/2021/10/26/9"
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} ,
{
"refsource" : "FEDORA" ,
"name" : "FEDORA-2021-c5a9c85737" ,
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/T5DKCYRC6MFSTFCUP4DELCOUUP3SFEFX/"
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}
]
} ,
"source" : {
"advisory" : "GHSA-67h7-w3jq-vh4q" ,
"discovery" : "UNKNOWN"
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}
}
