rhsa-2019_1943
Vulnerability from csaf_redhat
Published
2019-07-30 09:16
Modified
2024-09-13 14:09
Summary
Red Hat Security Advisory: libssh2 security update
Notes
Topic
An update for libssh2 is now available for Red Hat Enterprise Linux 7.4 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The libssh2 packages provide a library that implements the SSH2 protocol.
Security Fix(es):
* libssh2: Integer overflow in transport read resulting in out of bounds write (CVE-2019-3855)
* libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write (CVE-2019-3856)
* libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write (CVE-2019-3857)
* libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes (CVE-2019-3863)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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{
"acknowledgments": [
{
"names": [
"the libssh2 project"
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{
"names": [
"Chris Coulson"
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"organization": "Canonical Ltd.",
"summary": "Acknowledged by upstream."
}
],
"cve": "CVE-2019-3855",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2019-03-08T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1687303"
}
],
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{
"category": "description",
"text": "An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 in the way packets are read from the server. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libssh2: Integer overflow in transport read resulting in out of bounds write",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw was present in libssh2 packages included in Red Hat Virtualization Hypervisor and Management Appliance, however libssh2 in these hosts is never exposed to malicious clients or servers.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-3855"
},
{
"category": "external",
"summary": "RHBZ#1687303",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1687303"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-3855",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-3855"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-3855",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-3855"
},
{
"category": "external",
"summary": "https://www.libssh2.org/CVE-2019-3855.html",
"url": "https://www.libssh2.org/CVE-2019-3855.html"
}
],
"release_date": "2019-03-13T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nAfter installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.",
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "libssh2: Integer overflow in transport read resulting in out of bounds write"
},
{
"acknowledgments": [
{
"names": [
"the libssh2 project"
]
},
{
"names": [
"Chris Coulson"
],
"organization": "Canonical Ltd.",
"summary": "Acknowledged by upstream."
}
],
"cve": "CVE-2019-3856",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2019-03-08T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1687304"
}
],
"notes": [
{
"category": "description",
"text": "An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw was present in libssh2 packages included in Red Hat Virtualization Hypervisor and Management Appliance, however libssh2 in these hosts is never exposed to malicious clients or servers.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-3856"
},
{
"category": "external",
"summary": "RHBZ#1687304",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1687304"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-3856",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-3856"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-3856",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-3856"
},
{
"category": "external",
"summary": "https://www.libssh2.org/CVE-2019-3856.html",
"url": "https://www.libssh2.org/CVE-2019-3856.html"
}
],
"release_date": "2019-03-13T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nAfter installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2019:1943"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.0"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "libssh2: Integer overflow in keyboard interactive handling resulting in out of bounds write"
},
{
"acknowledgments": [
{
"names": [
"the libssh2 project"
]
},
{
"names": [
"Chris Coulson"
],
"organization": "Canonical Ltd.",
"summary": "Acknowledged by upstream."
}
],
"cve": "CVE-2019-3857",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2019-03-08T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1687305"
}
],
"notes": [
{
"category": "description",
"text": "An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw was present in libssh2 packages included in Red Hat Virtualization Hypervisor and Management Appliance, however libssh2 in these hosts is never exposed to malicious clients or servers.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2019-3857"
},
{
"category": "external",
"summary": "RHBZ#1687305",
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},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-3857",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-3857"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-3857",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-3857"
},
{
"category": "external",
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}
],
"release_date": "2019-03-13T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "libssh2: Integer overflow in SSH packet processing channel resulting in out of bounds write"
},
{
"acknowledgments": [
{
"names": [
"the libssh2 project"
]
},
{
"names": [
"Chris Coulson"
],
"organization": "Canonical Ltd.",
"summary": "Acknowledged by upstream."
}
],
"cve": "CVE-2019-3863",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2019-03-08T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "1687313"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in libssh2. A server could send a multiple keyboard interactive response messages, whose total length are greater than the unsigned char max characters. This value is used as an index to copy memory causing in an out of bounds memory write error. The highest threat from this vulnerability is to data confidentiality and integrity and system availability.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw was present in libssh2 packages included in Red Hat Virtualization Hypervisor and Management Appliance, however libssh2 in these hosts is never exposed to malicious clients or servers.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2019-3863"
},
{
"category": "external",
"summary": "RHBZ#1687313",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=1687313"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2019-3863",
"url": "https://www.cve.org/CVERecord?id=CVE-2019-3863"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2019-3863",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-3863"
},
{
"category": "external",
"summary": "https://www.libssh2.org/CVE-2019-3863.html",
"url": "https://www.libssh2.org/CVE-2019-3863.html"
}
],
"release_date": "2019-03-13T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nAfter installing these updated packages, all running applications using libssh2 must be restarted for this update to take effect.",
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"url": "https://access.redhat.com/errata/RHSA-2019:1943"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.0"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "libssh2: Integer overflow in user authenticate keyboard interactive allows out-of-bounds writes"
}
]
}
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