ubuntu-cve-2017-15906
Vulnerability from osv_ubuntu
Published
2017-10-25 00:00
Modified
2026-05-29 17:45
Summary
Details
The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.
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": "1:6.6p1-2ubuntu2.10"
},
{
"binary_name": "openssh-server",
"binary_version": "1:6.6p1-2ubuntu2.10"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:6.6p1-2ubuntu2.10"
},
{
"binary_name": "ssh",
"binary_version": "1:6.6p1-2ubuntu2.10"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:6.6p1-2ubuntu2.10"
},
{
"binary_name": "ssh-krb5",
"binary_version": "1:6.6p1-2ubuntu2.10"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.10?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:6.6p1-2ubuntu2.10"
}
],
"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"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:7.2p2-4ubuntu2.4"
},
{
"binary_name": "openssh-client-ssh1",
"binary_version": "1:7.2p2-4ubuntu2.4"
},
{
"binary_name": "openssh-server",
"binary_version": "1:7.2p2-4ubuntu2.4"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:7.2p2-4ubuntu2.4"
},
{
"binary_name": "ssh",
"binary_version": "1:7.2p2-4ubuntu2.4"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:7.2p2-4ubuntu2.4"
},
{
"binary_name": "ssh-krb5",
"binary_version": "1:7.2p2-4ubuntu2.4"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.4?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:7.2p2-4ubuntu2.4"
}
],
"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"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:7.6p1-4"
},
{
"binary_name": "openssh-server",
"binary_version": "1:7.6p1-4"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:7.6p1-4"
},
{
"binary_name": "ssh",
"binary_version": "1:7.6p1-4"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:7.6p1-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:7.6p1-4?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1:7.6p1-4"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:7.5p1-10"
]
}
],
"aliases": [],
"details": "The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.",
"id": "UBUNTU-CVE-2017-15906",
"modified": "2026-05-29T17:45:13Z",
"published": "2017-10-25T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2017-15906"
},
{
"type": "REPORT",
"url": "https://www.openssh.com/txt/release-7.6"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-3538-1"
},
{
"type": "REPORT",
"url": "https://xorl.wordpress.com/2017/11/13/openssh-sftp-server-remote-security-vulnerability/"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2017-15906"
}
],
"related": [
"USN-3538-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2017-15906"
]
}
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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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