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<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 libssh is now available for openEuler-20.03-LTS-SP1 and openEuler-20.03-LTS-SP2</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-2021-1343</ID>
		</Identification>
		<Status>Final</Status>
		<Version>1.0</Version>
		<RevisionHistory>
			<Revision>
				<Number>1.0</Number>
				<Date>2021-09-18</Date>
				<Description>Initial</Description>
			</Revision>
		</RevisionHistory>
		<InitialReleaseDate>2021-09-18</InitialReleaseDate>
		<CurrentReleaseDate>2021-09-18</CurrentReleaseDate>
		<Generator>
			<Engine>openEuler SA Tool V1.0</Engine>
			<Date>2021-09-18</Date>
		</Generator>
	</DocumentTracking>
	<DocumentNotes>
		<Note Title="Synopsis" Type="General" Ordinal="1" xml:lang="en">libssh security update</Note>
		<Note Title="Summary" Type="General" Ordinal="2" xml:lang="en">An update for libssh is now available for openEuler-20.03-LTS-SP1 and openEuler-20.03-LTS-SP2.</Note>
		<Note Title="Description" Type="General" Ordinal="3" xml:lang="en">The ssh library was designed to be used by programmers needing a working SSH implementation by the mean of a library. The complete control of the client is made by the programmer. With libssh, you can remotely execute programs, transfer files, use a secure and transparent tunnel for your remote programs. With its Secure FTP implementation, you can play with remote files easily, without third-party programs others than libcrypto (from openssl).

Security Fix(es):

A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared secrets during the lifetime of the session. One of them is called secret_hash and the other session_id. Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked as long as these buffers were same. But the key re-exchange operation can also change the key exchange method, which can be based on hash of different size, eventually creating &quot;secret_hash&quot; of different size than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used again during second key re-exchange.(CVE-2021-3634)</Note>
		<Note Title="Topic" Type="General" Ordinal="4" xml:lang="en">An update for libssh is now available for openEuler-20.03-LTS-SP1 and openEuler-20.03-LTS-SP2.

openEuler Security has rated this update as having a security impact of medium. 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">Medium</Note>
		<Note Title="Affected Component" Type="General" Ordinal="6" xml:lang="en">libssh</Note>
	</DocumentNotes>
	<DocumentReferences>
		<Reference Type="Self">
			<URL>https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1343</URL>
		</Reference>
		<Reference Type="openEuler CVE">
			<URL>https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-3634</URL>
		</Reference>
		<Reference Type="Other">
			<URL>https://nvd.nist.gov/vuln/detail/CVE-2021-3634</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>
			<FullProductName ProductID="openEuler-20.03-LTS-SP2" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">openEuler-20.03-LTS-SP2</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="aarch64">
			<FullProductName ProductID="libssh-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-0.9.4-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="libssh-devel-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-devel-0.9.4-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="libssh-debugsource-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-debugsource-0.9.4-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="libssh-debuginfo-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-debuginfo-0.9.4-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="libssh-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-0.9.4-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="libssh-debugsource-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-debugsource-0.9.4-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="libssh-devel-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-devel-0.9.4-5.oe1.aarch64.rpm</FullProductName>
			<FullProductName ProductID="libssh-debuginfo-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-debuginfo-0.9.4-5.oe1.aarch64.rpm</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="noarch">
			<FullProductName ProductID="libssh-help-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-help-0.9.4-5.oe1.noarch.rpm</FullProductName>
			<FullProductName ProductID="libssh-help-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-help-0.9.4-5.oe1.noarch.rpm</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="src">
			<FullProductName ProductID="libssh-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-0.9.4-5.oe1.src.rpm</FullProductName>
			<FullProductName ProductID="libssh-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-0.9.4-5.oe1.src.rpm</FullProductName>
		</Branch>
		<Branch Type="Package Arch" Name="x86_64">
			<FullProductName ProductID="libssh-debugsource-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-debugsource-0.9.4-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="libssh-devel-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-devel-0.9.4-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="libssh-debuginfo-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-debuginfo-0.9.4-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="libssh-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP1">libssh-0.9.4-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="libssh-debugsource-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-debugsource-0.9.4-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="libssh-debuginfo-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-debuginfo-0.9.4-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="libssh-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-0.9.4-5.oe1.x86_64.rpm</FullProductName>
			<FullProductName ProductID="libssh-devel-0.9.4-5" CPE="cpe:/a:openEuler:openEuler:20.03-LTS-SP2">libssh-devel-0.9.4-5.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">A flaw has been found in libssh in versions prior to 0.9.6. The SSH protocol keeps track of two shared secrets during the lifetime of the session. One of them is called secret_hash and the other session_id. Initially, both of them are the same, but after key re-exchange, previous session_id is kept and used as an input to new secret_hash. Historically, both of these buffers had shared length variable, which worked as long as these buffers were same. But the key re-exchange operation can also change the key exchange method, which can be based on hash of different size, eventually creating &quot;secret_hash&quot; of different size than the session_id has. This becomes an issue when the session_id memory is zeroed or when it is used again during second key re-exchange.</Note>
		</Notes>
		<ReleaseDate>2021-09-18</ReleaseDate>
		<CVE>CVE-2021-3634</CVE>
		<ProductStatuses>
			<Status Type="Fixed">
				<ProductID>openEuler-20.03-LTS-SP1</ProductID>
				<ProductID>openEuler-20.03-LTS-SP2</ProductID>
			</Status>
		</ProductStatuses>
		<Threats>
			<Threat Type="Impact">
				<Description>Medium</Description>
			</Threat>
		</Threats>
		<CVSSScoreSets>
			<ScoreSet>
				<BaseScore>6.5</BaseScore>
				<Vector>AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H</Vector>
			</ScoreSet>
		</CVSSScoreSets>
		<Remediations>
			<Remediation Type="Vendor Fix">
				<Description>libssh security update</Description>
				<DATE>2021-09-18</DATE>
				<URL>https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1343</URL>
			</Remediation>
		</Remediations>
	</Vulnerability>
</cvrfdoc>