GSD-2021-26720
Vulnerability from gsd - Updated: 2023-12-13 01:23Details
avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-26720",
"description": "avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.",
"id": "GSD-2021-26720",
"references": [
"https://www.suse.com/security/cve/CVE-2021-26720.html"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-26720"
],
"details": "avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.",
"id": "GSD-2021-26720",
"modified": "2023-12-13T01:23:33.520281Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
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"STATE": "PUBLIC"
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"value": "avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product."
}
]
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"name": "https://packages.debian.org/buster/avahi-daemon",
"refsource": "MISC",
"url": "https://packages.debian.org/buster/avahi-daemon"
},
{
"name": "https://packages.debian.org/sid/avahi-daemon",
"refsource": "MISC",
"url": "https://packages.debian.org/sid/avahi-daemon"
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"url": "https://packages.debian.org/bullseye/avahi-daemon"
},
{
"name": "https://security-tracker.debian.org/tracker/CVE-2021-26720",
"refsource": "MISC",
"url": "https://security-tracker.debian.org/tracker/CVE-2021-26720"
},
{
"name": "https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824",
"refsource": "MISC",
"url": "https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824"
},
{
"name": "https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog",
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"url": "https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog"
},
{
"name": "https://www.openwall.com/lists/oss-security/2021/02/15/2",
"refsource": "MISC",
"url": "https://www.openwall.com/lists/oss-security/2021/02/15/2"
},
{
"name": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796",
"refsource": "MISC",
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},
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"name": "https://bugzilla.suse.com/show_bug.cgi?id=1180827",
"refsource": "MISC",
"url": "https://bugzilla.suse.com/show_bug.cgi?id=1180827"
},
{
"name": "[debian-lts-announce] 20220607 [SECURITY] [DLA 3047-1] avahi security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html"
}
]
}
},
"nvd.nist.gov": {
"configurations": {
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"nodes": [
{
"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:a:avahi:avahi:*:*:*:*:*:*:*:*",
"cpe_name": [],
"versionEndIncluding": "0.8-4",
"vulnerable": true
}
],
"operator": "OR"
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"cpe_match": [
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"description": {
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"value": "avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product."
}
]
},
"problemtype": {
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"description": [
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"value": "CWE-59"
}
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}
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},
"references": {
"reference_data": [
{
"name": "https://packages.debian.org/buster/avahi-daemon",
"refsource": "MISC",
"tags": [
"Product",
"Third Party Advisory"
],
"url": "https://packages.debian.org/buster/avahi-daemon"
},
{
"name": "https://packages.debian.org/sid/avahi-daemon",
"refsource": "MISC",
"tags": [
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},
{
"name": "https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog",
"refsource": "MISC",
"tags": [
"Broken Link",
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],
"url": "https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog"
},
{
"name": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796",
"refsource": "MISC",
"tags": [
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"url": "https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796"
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{
"name": "https://bugzilla.suse.com/show_bug.cgi?id=1180827",
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"url": "https://bugzilla.suse.com/show_bug.cgi?id=1180827"
},
{
"name": "https://security-tracker.debian.org/tracker/CVE-2021-26720",
"refsource": "MISC",
"tags": [
"Third Party Advisory"
],
"url": "https://security-tracker.debian.org/tracker/CVE-2021-26720"
},
{
"name": "https://packages.debian.org/bullseye/avahi-daemon",
"refsource": "MISC",
"tags": [
"Product",
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"url": "https://packages.debian.org/bullseye/avahi-daemon"
},
{
"name": "https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824",
"refsource": "MISC",
"tags": [
"Issue Tracking",
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],
"url": "https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824"
},
{
"name": "https://www.openwall.com/lists/oss-security/2021/02/15/2",
"refsource": "MISC",
"tags": [
"Mailing List",
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],
"url": "https://www.openwall.com/lists/oss-security/2021/02/15/2"
},
{
"name": "[debian-lts-announce] 20220607 [SECURITY] [DLA 3047-1] avahi security update",
"refsource": "MLIST",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html"
}
]
}
},
"impact": {
"baseMetricV2": {
"acInsufInfo": false,
"cvssV2": {
"accessComplexity": "LOW",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 4.6,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 3.9,
"impactScore": 6.4,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"severity": "MEDIUM",
"userInteractionRequired": false
},
"baseMetricV3": {
"cvssV3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
},
"lastModifiedDate": "2022-12-06T21:52Z",
"publishedDate": "2021-02-17T22:15Z"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
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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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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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