ubuntu-cve-2021-33643
Vulnerability from osv_ubuntu
Published
2022-08-10 20:15
Modified
2026-06-25 06:26
Summary
Details
An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.
Severity
9.1 (Critical)
6.5 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libtar0",
"binary_version": "1.2.20-4ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "libtar",
"purl": "pkg:deb/ubuntu/libtar@1.2.20-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.20-4ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.20-4"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "libtar0",
"binary_version": "1.2.20-7ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "libtar",
"purl": "pkg:deb/ubuntu/libtar@1.2.20-7ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.20-7ubuntu0.1~esm1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.20-7"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libtar0",
"binary_version": "1.2.20-8ubuntu0.20.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "libtar",
"purl": "pkg:deb/ubuntu/libtar@1.2.20-8ubuntu0.20.04.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.20-8ubuntu0.20.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.20-7",
"1.2.20-8"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libtar0",
"binary_version": "1.2.20-8ubuntu0.22.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "libtar",
"purl": "pkg:deb/ubuntu/libtar@1.2.20-8ubuntu0.22.04.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.20-8ubuntu0.22.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.20-8"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libtar0t64",
"binary_version": "1.2.20-8.1ubuntu0.24.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libtar",
"purl": "pkg:deb/ubuntu/libtar@1.2.20-8.1ubuntu0.24.04.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.2.20-8.1ubuntu0.24.04.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.20-8",
"1.2.20-8.1",
"1.2.20-8.1build1"
]
}
],
"aliases": [],
"details": "An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.",
"id": "UBUNTU-CVE-2021-33643",
"modified": "2026-06-25T06:26:29Z",
"published": "2022-08-10T20:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2021-33643"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-33643"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2121289"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-7398-1"
}
],
"related": [
"USN-7398-1"
],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2021-33643"
]
}
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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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