USN-4446-1 (UBUNTU-CVE-2019-12520)
Vulnerability from osv_ubuntu – Published: 2020-08-03 13:25 – Updated: 2026-02-10 04:41 – Source website
VLAI
Summary
squid3 vulnerabilities
Details
Jeriko One discovered that Squid incorrectly handled caching certain requests. A remote attacker could possibly use this issue to perform cache-injection attacks or gain access to reverse proxy features such as ESI. (CVE-2019-12520)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled certain URN requests. A remote attacker could possibly use this issue to bypass access checks. (CVE-2019-12523)
Jeriko One discovered that Squid incorrectly handled URL decoding. A remote attacker could possibly use this issue to bypass certain rule checks. (CVE-2019-12524)
Jeriko One and Kristoffer Danielsson discovered that Squid incorrectly handled input validation. A remote attacker could use this issue to cause Squid to crash, resulting in a denial of service. (CVE-2019-18676)
References
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2019-12523",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2019-18676",
"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": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:16.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.12-1ubuntu7.12"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.12-1ubuntu7.12"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.12-1ubuntu7.12"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.12-1ubuntu7.12"
},
{
"binary_name": "squid3",
"binary_version": "3.5.12-1ubuntu7.12"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.12-1ubuntu7.12"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.12?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.12-1ubuntu7.12"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.3.8-1ubuntu16",
"3.3.8-1ubuntu17",
"3.5.12-1ubuntu6",
"3.5.12-1ubuntu7",
"3.5.12-1ubuntu7.1",
"3.5.12-1ubuntu7.2",
"3.5.12-1ubuntu7.3",
"3.5.12-1ubuntu7.4",
"3.5.12-1ubuntu7.5",
"3.5.12-1ubuntu7.6",
"3.5.12-1ubuntu7.7",
"3.5.12-1ubuntu7.8",
"3.5.12-1ubuntu7.9",
"3.5.12-1ubuntu7.10",
"3.5.12-1ubuntu7.11"
]
},
{
"database_specific": {
"cves_map": {
"cves": [
{
"id": "CVE-2019-12520",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2019-12523",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2019-12524",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
]
},
{
"id": "CVE-2019-18676",
"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": "medium",
"type": "Ubuntu"
}
]
}
],
"ecosystem": "Ubuntu:18.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.27-1ubuntu1.7"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.27-1ubuntu1.7"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.27-1ubuntu1.7"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.27-1ubuntu1.7"
},
{
"binary_name": "squid3",
"binary_version": "3.5.27-1ubuntu1.7"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.27-1ubuntu1.7"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.7?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.27-1ubuntu1.7"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.5.23-5ubuntu1",
"3.5.23-5ubuntu2",
"3.5.27-1ubuntu1",
"3.5.27-1ubuntu1.1",
"3.5.27-1ubuntu1.2",
"3.5.27-1ubuntu1.3",
"3.5.27-1ubuntu1.4",
"3.5.27-1ubuntu1.5",
"3.5.27-1ubuntu1.6"
]
}
],
"aliases": [],
"details": "Jeriko One discovered that Squid incorrectly handled caching certain\nrequests. A remote attacker could possibly use this issue to perform\ncache-injection attacks or gain access to reverse proxy features such as\nESI. (CVE-2019-12520)\n\nJeriko One and Kristoffer Danielsson discovered that Squid incorrectly\nhandled certain URN requests. A remote attacker could possibly use this\nissue to bypass access checks. (CVE-2019-12523)\n\nJeriko One discovered that Squid incorrectly handled URL decoding. A remote\nattacker could possibly use this issue to bypass certain rule checks.\n(CVE-2019-12524)\n\nJeriko One and Kristoffer Danielsson discovered that Squid incorrectly\nhandled input validation. A remote attacker could use this issue to cause\nSquid to crash, resulting in a denial of service. (CVE-2019-18676)\n",
"id": "USN-4446-1",
"modified": "2026-02-10T04:41:54Z",
"published": "2020-08-03T13:25:55Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4446-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2019-12520"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2019-12523"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2019-12524"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2019-18676"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "squid3 vulnerabilities",
"upstream": [
"UBUNTU-CVE-2019-12520",
"UBUNTU-CVE-2019-12523",
"UBUNTU-CVE-2019-12524",
"UBUNTU-CVE-2019-18676"
]
}
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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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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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