ubuntu-cve-2016-20012
Vulnerability from osv_ubuntu
Published
2021-09-15 20:15
Modified
2026-07-13 13:52
Summary
Details
OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product
Severity
5.3 (Medium)
5.3 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "openssh-client",
"binary_version": "1:6.6p1-2ubuntu2.13+esm2"
},
{
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},
{
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},
{
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},
{
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},
{
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}
]
},
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},
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}
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}
],
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"1:6.5p1-4",
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"1:6.6p1-2ubuntu2",
"1:6.6p1-2ubuntu2.2",
"1:6.6p1-2ubuntu2.3",
"1:6.6p1-2ubuntu2.4",
"1:6.6p1-2ubuntu2.6",
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]
},
{
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{
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},
{
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},
{
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{
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},
{
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},
{
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{
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},
{
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},
{
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{
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},
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{
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{
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]
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},
{
"binary_name": "openssh-server",
"binary_version": "1:8.9p1-3ubuntu0.16"
},
{
"binary_name": "openssh-sftp-server",
"binary_version": "1:8.9p1-3ubuntu0.16"
},
{
"binary_name": "openssh-tests",
"binary_version": "1:8.9p1-3ubuntu0.16"
},
{
"binary_name": "ssh",
"binary_version": "1:8.9p1-3ubuntu0.16"
},
{
"binary_name": "ssh-askpass-gnome",
"binary_version": "1:8.9p1-3ubuntu0.16"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "openssh",
"purl": "pkg:deb/ubuntu/openssh@1:8.9p1-3ubuntu0.16?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:8.4p1-6ubuntu2",
"1:8.7p1-2",
"1:8.7p1-2build1",
"1:8.7p1-4",
"1:8.8p1-1",
"1:8.9p1-3",
"1:8.9p1-3ubuntu0.1",
"1:8.9p1-3ubuntu0.3",
"1:8.9p1-3ubuntu0.4",
"1:8.9p1-3ubuntu0.5",
"1:8.9p1-3ubuntu0.6",
"1:8.9p1-3ubuntu0.7",
"1:8.9p1-3ubuntu0.10",
"1:8.9p1-3ubuntu0.11",
"1:8.9p1-3ubuntu0.13",
"1:8.9p1-3ubuntu0.14",
"1:8.9p1-3ubuntu0.15",
"1:8.9p1-3ubuntu0.16"
]
},
{
"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"
]
}
],
"aliases": [],
"details": "OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product",
"id": "UBUNTU-CVE-2016-20012",
"modified": "2026-07-13T13:52:35Z",
"published": "2021-09-15T20:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2016-20012"
},
{
"type": "REPORT",
"url": "https://github.com/openssh/openssh-portable/pull/270"
},
{
"type": "REPORT",
"url": "https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265"
},
{
"type": "REPORT",
"url": "https://rushter.com/blog/public-ssh-keys/"
},
{
"type": "REPORT",
"url": "https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2016-20012"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "negligible",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2016-20012"
]
}
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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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