<?xml version="1.0" encoding="UTF-8"?>
<cvrfdoc xmlns="http://www.icasi.org/CVRF/schema/cvrf/1.1" xmlns:cvrf="http://www.icasi.org/CVRF/schema/cvrf/1.1">
	<DocumentTitle xml:lang="en">An update for flatpak is now available for openEuler-20.03-LTS-SP1</DocumentTitle>
	<DocumentType>Security Advisory</DocumentType>
	<DocumentPublisher Type="Vendor">
		<ContactDetails>openeuler-security@openeuler.org</ContactDetails>
		<IssuingAuthority>openEuler security committee</IssuingAuthority>
	</DocumentPublisher>
	<DocumentTracking>
		<Identification>
			<ID>openEuler-SA-2021-1149</ID>
		</Identification>
		<Status>Final</Status>
		<Version>1.0</Version>
		<RevisionHistory>
			<Revision>
				<Number>1.0</Number>
				<Date>2021-05-06</Date>
				<Description>Initial</Description>
			</Revision>
		</RevisionHistory>
		<InitialReleaseDate>2021-05-06</InitialReleaseDate>
		<CurrentReleaseDate>2021-05-06</CurrentReleaseDate>
		<Generator>
			<Engine>openEuler SA Tool V1.0</Engine>
			<Date>2021-05-06</Date>
		</Generator>
	</DocumentTracking>
	<DocumentNotes>
		<Note Title="Synopsis" Type="General" Ordinal="1" xml:lang="en">flatpak security update</Note>
		<Note Title="Summary" Type="General" Ordinal="2" xml:lang="en">An update for flatpak is now available for openEuler-20.03-LTS-SP1.</Note>
		<Note Title="Description" Type="General" Ordinal="3" xml:lang="en">flatpak is a system for building, distributing and running sandboxed desktop applications on Linux. See https://wiki.gnome.org/Projects/SandboxedApps for more information.

Security Fix(es):

Flatpak before 1.0.7, and 1.1.x and 1.2.x before 1.2.3, exposes /proc in the apply_extra script sandbox, which allows attackers to modify a host-side executable file.(CVE-2019-8308)

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 &quot;file forwarding&quot; feature which can be used by an attacker to gain access to files that would not ordinarily be allowed by the app&apos;s permissions. By putting the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak app&apos;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 &quot;`Disallow @@ and @@U usage in desktop files`&quot;. The follow-up commits &quot;`dir: Reserve the whole @@ prefix`&quot; and &quot;`dir: Refuse to export .desktop files with suspicious uses of @@ tokens`&quot; are recommended, but not strictly required. As a workaround, avoid installing Flatpak apps from untrusted sources, or check the contents of the exported `.desktop` files in `exports/share/applications/*.desktop` (typically `~/.local/share/flatpak/exports/share/applications/*.desktop` and `/var/lib/flatpak/exports/share/applications/*.desktop`) to make sure that literal filenames do not follow `@@` or `@@u`.(CVE-2021-21381)</Note>
		<Note Title="Topic" Type="General" Ordinal="4" xml:lang="en">An update for flatpak is now available for openEuler-20.03-LTS-SP1.

openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section.</Note>
		<Note Title="Severity" Type="General" Ordinal="5" xml:lang="en">High</Note>
		<Note Title="Affected Component" Type="General" Ordinal="6" xml:lang="en">flatpak</Note>
	</DocumentNotes>
	<DocumentReferences>
		<Reference Type="Self">
			<URL>https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1149</URL>
		</Reference>
		<Reference Type="openEuler CVE">
			<URL>https://openeuler.org/en/security/cve/detail.html?id=CVE-2019-8308</URL>
			<URL>https://openeuler.org/en/security/cve/detail.html?id=CVE-2021-21381</URL>
		</Reference>
		<Reference Type="Other">
			<URL>https://nvd.nist.gov/vuln/detail/CVE-2019-8308</URL>
			<URL>https://nvd.nist.gov/vuln/detail/CVE-2021-21381</URL>
		</Reference>
	</DocumentReferences>
	<ProductTree xmlns="http://www.icasi.org/CVRF/schema/prod/1.1">
		<Branch Type="Product Name" Name="openEuler">
			<FullProductName ProductID="openEuler-20.03-LTS-SP1" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">openEuler-20.03-LTS-SP1</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="aarch64">
			<FullProductName ProductID="flatpak-debuginfo-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-debuginfo-1.0.3-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="flatpak-debugsource-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-debugsource-1.0.3-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="flatpak-devel-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-devel-1.0.3-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="flatpak-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-1.0.3-5.oe1.aarch64.rpm</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="noarch">
			<FullProductName ProductID="flatpak-help-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-help-1.0.3-5.oe1.noarch.rpm</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="src">
			<FullProductName ProductID="flatpak-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-1.0.3-5.oe1.src.rpm</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="x86_64">
			<FullProductName ProductID="flatpak-devel-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-devel-1.0.3-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="flatpak-debuginfo-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-debuginfo-1.0.3-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="flatpak-debugsource-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-debugsource-1.0.3-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="flatpak-1.0.3-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">flatpak-1.0.3-5.oe1.x86_64.rpm</FullProductName>
		</Branch>
	</ProductTree>
	<Vulnerability Ordinal="1" xmlns="http://www.icasi.org/CVRF/schema/vuln/1.1">
		<Notes>
			<Note Title="Vulnerability Description" Type="General" Ordinal="1" xml:lang="en">Flatpak before 1.0.7, and 1.1.x and 1.2.x before 1.2.3, exposes /proc in the apply_extra script sandbox, which allows attackers to modify a host-side executable file.</Note>
		</Notes>
		<ReleaseDate>2021-05-06</ReleaseDate>
		<CVE>CVE-2019-8308</CVE>
		<ProductStatuses>
			<Status Type="Fixed">
				<ProductID>openEuler-20.03-LTS-SP1</ProductID>
			</Status>
		</ProductStatuses>
		<Threats>
			<Threat Type="Impact">
				<Description>High</Description>
			</Threat>
		</Threats>
		<CVSSScoreSets>
			<ScoreSet>
				<BaseScore>8.2</BaseScore>
				<Vector>AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H</Vector>
			</ScoreSet>
		</CVSSScoreSets>
		<Remediations>
			<Remediation Type="Vendor Fix">
				<Description>flatpak security update</Description>
				<DATE>2021-05-06</DATE>
				<URL>https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1149</URL>
			</Remediation>
		</Remediations>
	</Vulnerability>
	<Vulnerability Ordinal="2" xmlns="http://www.icasi.org/CVRF/schema/vuln/1.1">
		<Notes>
			<Note Title="Vulnerability Description" Type="General" Ordinal="2" xml:lang="en">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 &quot;file forwarding&quot; feature which can be used by an attacker to gain access to files that would not ordinarily be allowed by the app&apos;s permissions. By putting the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak app&apos;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 &quot;`Disallow @@ and @@U usage in desktop files`&quot;. The follow-up commits &quot;`dir: Reserve the whole @@ prefix`&quot; and &quot;`dir: Refuse to export .desktop files with suspicious uses of @@ tokens`&quot; are recommended, but not strictly required. As a workaround, avoid installing Flatpak apps from untrusted sources, or check the contents of the exported `.desktop` files in `exports/share/applications/*.desktop` (typically `~/.local/share/flatpak/exports/share/applications/*.desktop` and `/var/lib/flatpak/exports/share/applications/*.desktop`) to make sure that literal filenames do not follow `@@` or `@@u`.</Note>
		</Notes>
		<ReleaseDate>2021-05-06</ReleaseDate>
		<CVE>CVE-2021-21381</CVE>
		<ProductStatuses>
			<Status Type="Fixed">
				<ProductID>openEuler-20.03-LTS-SP1</ProductID>
			</Status>
		</ProductStatuses>
		<Threats>
			<Threat Type="Impact">
				<Description>High</Description>
			</Threat>
		</Threats>
		<CVSSScoreSets>
			<ScoreSet>
				<BaseScore>8.2</BaseScore>
				<Vector>AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N</Vector>
			</ScoreSet>
		</CVSSScoreSets>
		<Remediations>
			<Remediation Type="Vendor Fix">
				<Description>flatpak security update</Description>
				<DATE>2021-05-06</DATE>
				<URL>https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1149</URL>
			</Remediation>
		</Remediations>
	</Vulnerability>
</cvrfdoc>