ubuntu-cve-2018-20685
Vulnerability from osv_ubuntu
Published
2019-01-10 00:00
Modified
2025-12-19 16:51
Summary
Details
In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.
Severity
5.3 (Medium)
5.3 (Medium)
5.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:6.6p1-2ubuntu2.12"
},
{
"binary_name": "openssh-server",
"binary_version": "1:6.6p1-2ubuntu2.12"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:6.6p1-2ubuntu2.12"
},
{
"binary_name": "ssh",
"binary_version": "1:6.6p1-2ubuntu2.12"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:6.6p1-2ubuntu2.12"
},
{
"binary_name": "ssh-krb5",
"binary_version": "1:6.6p1-2ubuntu2.12"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.12?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:6.6p1-2ubuntu2.12"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:6.2p2-6",
"1:6.2p2-6ubuntu1",
"1:6.4p1-1",
"1:6.4p1-2",
"1:6.5p1-1",
"1:6.5p1-2",
"1:6.5p1-3",
"1:6.5p1-4",
"1:6.5p1-6",
"1:6.6p1-1",
"1:6.6p1-2",
"1:6.6p1-2ubuntu1",
"1:6.6p1-2ubuntu2",
"1:6.6p1-2ubuntu2.2",
"1:6.6p1-2ubuntu2.3",
"1:6.6p1-2ubuntu2.4",
"1:6.6p1-2ubuntu2.6",
"1:6.6p1-2ubuntu2.7",
"1:6.6p1-2ubuntu2.8",
"1:6.6p1-2ubuntu2.10",
"1:6.6p1-2ubuntu2.11"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:7.2p2-4ubuntu2.7"
},
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.2p2-4ubuntu2.7"
},
{
"binary_name": "openssh-server",
"binary_version": "1:7.2p2-4ubuntu2.7"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:7.2p2-4ubuntu2.7"
},
{
"binary_name": "ssh",
"binary_version": "1:7.2p2-4ubuntu2.7"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:7.2p2-4ubuntu2.7"
},
{
"binary_name": "ssh-krb5",
"binary_version": "1:7.2p2-4ubuntu2.7"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.7?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:7.2p2-4ubuntu2.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:6.9p1-2",
"1:6.9p1-3",
"1:7.1p1-1",
"1:7.1p1-3",
"1:7.1p1-4",
"1:7.1p1-6",
"1:7.1p2-1",
"1:7.1p2-2",
"1:7.2p1-1",
"1:7.2p2-1",
"1:7.2p2-2",
"1:7.2p2-3",
"1:7.2p2-4",
"1:7.2p2-4ubuntu1",
"1:7.2p2-4ubuntu2.1",
"1:7.2p2-4ubuntu2.2",
"1:7.2p2-4ubuntu2.4",
"1:7.2p2-4ubuntu2.5",
"1:7.2p2-4ubuntu2.6"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "openssh-client-hmac",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "openssh-server",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "openssh-server-hmac",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "ssh",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
},
{
"binary_name": "ssh-krb5",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.8.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:16.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.fips.2.8.1?arch=source\u0026distro=fips-updates/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:7.2p2-4ubuntu2.fips.2.8.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.2p2-4ubuntu2.fips.2.2.3",
"1:7.2p2-4ubuntu2.fips.2.4.1",
"1:7.2p2-4ubuntu2.fips.2.4.2"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "openssh-client-hmac",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "openssh-server",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "openssh-server-hmac",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "ssh",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
},
{
"binary_name": "ssh-krb5",
"binary_version": "1:7.2p2-4ubuntu2.fips.2.10.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:FIPS:16.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.fips.2.10.1?arch=source\u0026distro=fips/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:7.2p2-4ubuntu2.fips.2.10.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.2p2-4ubuntu2.fips.2.2",
"1:7.2p2-4ubuntu2.fips.2.2.1"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:7.6p1-4ubuntu0.2"
},
{
"binary_name": "openssh-server",
"binary_version": "1:7.6p1-4ubuntu0.2"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:7.6p1-4ubuntu0.2"
},
{
"binary_name": "ssh",
"binary_version": "1:7.6p1-4ubuntu0.2"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:7.6p1-4ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:7.6p1-4ubuntu0.2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:7.6p1-4ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-10",
"1:7.6p1-4",
"1:7.6p1-4ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.5p1-10"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-10?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-8",
"1:7.5p1-9",
"1:7.5p1-9build1",
"1:7.5p1-10"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.5p1-11build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-11build1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-11build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.5p1-13"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-13?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-12",
"1:7.5p1-12build1",
"1:7.5p1-13"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.5p1-16"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "openssh-ssh1",
"purl": "pkg:deb/ubuntu/openssh-ssh1@1:7.5p1-16?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-14",
"1:7.5p1-15",
"1:7.5p1-15build1",
"1:7.5p1-16"
]
}
],
"aliases": [],
"details": "In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.",
"id": "UBUNTU-CVE-2018-20685",
"modified": "2025-12-19T16:51:49Z",
"published": "2019-01-10T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2018-20685"
},
{
"type": "REPORT",
"url": "https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt"
},
{
"type": "REPORT",
"url": "https://lists.mindrot.org/pipermail/openssh-unix-dev/2019-January/037459.html"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-3885-1"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2018-20685"
}
],
"related": [
"USN-3885-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2018-20685"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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