USN-4888-1 (UBUNTU-CVE-2020-27840)
Vulnerability from osv_ubuntu – Published: 2021-03-24 18:08 – Updated: 2026-04-22 07:36 – Source website
VLAI
Summary
ldb vulnerabilities
Details
Douglas Bagnall discovered that ldb, when used with Samba, incorrectly handled certain LDAP attributes. A remote attacker could possibly use this issue to cause the LDAP server to crash, resulting in a denial of service. (CVE-2021-20277)
Douglas Bagnall discovered that ldb, when used with Samba, incorrectly handled certain DN strings. A remote attacker could use this issue to cause the LDAP server to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2020-27840)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-27840",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20277",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ldb-tools",
"binary_version": "2:1.1.24-1ubuntu3.2"
},
{
"binary_name": "libldb1",
"binary_version": "2:1.1.24-1ubuntu3.2"
},
{
"binary_name": "python-ldb",
"binary_version": "2:1.1.24-1ubuntu3.2"
},
{
"binary_name": "python3-ldb",
"binary_version": "2:1.1.24-1ubuntu3.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "ldb",
"purl": "pkg:deb/ubuntu/ldb@2:1.1.24-1ubuntu3.2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.1.24-1ubuntu3.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.1.20-2",
"2:1.1.21-1",
"2:1.1.23-1",
"2:1.1.23-1ubuntu1",
"2:1.1.24-1ubuntu1",
"2:1.1.24-1ubuntu3",
"2:1.1.24-1ubuntu3.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-27840",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20277",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ldb-tools",
"binary_version": "2:1.2.3-1ubuntu0.2"
},
{
"binary_name": "libldb1",
"binary_version": "2:1.2.3-1ubuntu0.2"
},
{
"binary_name": "python-ldb",
"binary_version": "2:1.2.3-1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "ldb",
"purl": "pkg:deb/ubuntu/ldb@2:1.2.3-1ubuntu0.2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:1.2.3-1ubuntu0.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.1.29-2",
"2:1.2.2-2",
"2:1.2.3-1",
"2:1.2.3-1ubuntu0.1"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2020-27840",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2021-20277",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "high",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:20.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "ldb-tools",
"binary_version": "2:2.0.10-0ubuntu0.20.04.3"
},
{
"binary_name": "libldb2",
"binary_version": "2:2.0.10-0ubuntu0.20.04.3"
},
{
"binary_name": "python3-ldb",
"binary_version": "2:2.0.10-0ubuntu0.20.04.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "ldb",
"purl": "pkg:deb/ubuntu/ldb@2:2.0.10-0ubuntu0.20.04.3?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2:2.0.10-0ubuntu0.20.04.3"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2:1.5.5-0ubuntu2",
"2:1.5.5-0ubuntu3",
"2:2.0.7-4",
"2:2.0.8-1ubuntu1",
"2:2.0.8-2",
"2:2.0.10-0ubuntu0.20.04.1",
"2:2.0.10-0ubuntu0.20.04.2"
]
}
],
"aliases": [],
"details": "Douglas Bagnall discovered that ldb, when used with Samba, incorrectly\nhandled certain LDAP attributes. A remote attacker could possibly use this\nissue to cause the LDAP server to crash, resulting in a denial of service.\n(CVE-2021-20277)\n\nDouglas Bagnall discovered that ldb, when used with Samba, incorrectly\nhandled certain DN strings. A remote attacker could use this issue to\ncause the LDAP server to crash, resulting in a denial of service, or\npossibly execute arbitrary code. (CVE-2020-27840)\n",
"id": "USN-4888-1",
"modified": "2026-04-22T07:36:59Z",
"published": "2021-03-24T18:08:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4888-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2020-27840"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-20277"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "ldb vulnerabilities",
"upstream": [
"UBUNTU-CVE-2020-27840",
"UBUNTU-CVE-2021-20277"
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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