UBUNTU-CVE-2023-46728 (CVE-2023-46728)
Vulnerability from osv_ubuntu – Published: 2023-11-06 18:15 – Updated: 2025-09-08 16:56 – Source website
VLAI
Details
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid's Gopher gateway. The gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this bug are possible to be received from any gopher server, even those without malicious intent. Gopher support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should reject all gopher URL requests.
Severity
7.5 (High)
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.12-1ubuntu7.16+esm2"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.12-1ubuntu7.16+esm2"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.12-1ubuntu7.16+esm2"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.12-1ubuntu7.16+esm2"
},
{
"binary_name": "squid3",
"binary_version": "3.5.12-1ubuntu7.16+esm2"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.12-1ubuntu7.16+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3@3.5.12-1ubuntu7.16+esm2?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.12-1ubuntu7.16+esm2"
}
],
"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",
"3.5.12-1ubuntu7.12",
"3.5.12-1ubuntu7.13",
"3.5.12-1ubuntu7.14",
"3.5.12-1ubuntu7.15",
"3.5.12-1ubuntu7.16",
"3.5.12-1ubuntu7.16+esm1"
]
},
{
"ecosystem_specific": {
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"binaries": [
{
"binary_name": "squid",
"binary_version": "3.5.27-1ubuntu1.14+esm1"
},
{
"binary_name": "squid-cgi",
"binary_version": "3.5.27-1ubuntu1.14+esm1"
},
{
"binary_name": "squid-common",
"binary_version": "3.5.27-1ubuntu1.14+esm1"
},
{
"binary_name": "squid-purge",
"binary_version": "3.5.27-1ubuntu1.14+esm1"
},
{
"binary_name": "squid3",
"binary_version": "3.5.27-1ubuntu1.14+esm1"
},
{
"binary_name": "squidclient",
"binary_version": "3.5.27-1ubuntu1.14+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "squid3",
"purl": "pkg:deb/ubuntu/squid3@3.5.27-1ubuntu1.14+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.27-1ubuntu1.14+esm1"
}
],
"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",
"3.5.27-1ubuntu1.7",
"3.5.27-1ubuntu1.8",
"3.5.27-1ubuntu1.9",
"3.5.27-1ubuntu1.10",
"3.5.27-1ubuntu1.11",
"3.5.27-1ubuntu1.12",
"3.5.27-1ubuntu1.13",
"3.5.27-1ubuntu1.14"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "4.10-1ubuntu1.8"
},
{
"binary_name": "squid-cgi",
"binary_version": "4.10-1ubuntu1.8"
},
{
"binary_name": "squid-common",
"binary_version": "4.10-1ubuntu1.8"
},
{
"binary_name": "squid-purge",
"binary_version": "4.10-1ubuntu1.8"
},
{
"binary_name": "squidclient",
"binary_version": "4.10-1ubuntu1.8"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "squid",
"purl": "pkg:deb/ubuntu/squid@4.10-1ubuntu1.8?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.10-1ubuntu1.8"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.8-1ubuntu2",
"4.8-1ubuntu3",
"4.9-2ubuntu1",
"4.9-2ubuntu2",
"4.9-2ubuntu3",
"4.9-2ubuntu4",
"4.10-1ubuntu1",
"4.10-1ubuntu1.1",
"4.10-1ubuntu1.2",
"4.10-1ubuntu1.3",
"4.10-1ubuntu1.4",
"4.10-1ubuntu1.5",
"4.10-1ubuntu1.6",
"4.10-1ubuntu1.7"
]
},
{
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "squid",
"binary_version": "5.7-0ubuntu0.22.04.2"
},
{
"binary_name": "squid-cgi",
"binary_version": "5.7-0ubuntu0.22.04.2"
},
{
"binary_name": "squid-common",
"binary_version": "5.7-0ubuntu0.22.04.2"
},
{
"binary_name": "squid-openssl",
"binary_version": "5.7-0ubuntu0.22.04.2"
},
{
"binary_name": "squid-purge",
"binary_version": "5.7-0ubuntu0.22.04.2"
},
{
"binary_name": "squidclient",
"binary_version": "5.7-0ubuntu0.22.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "squid",
"purl": "pkg:deb/ubuntu/squid@5.7-0ubuntu0.22.04.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.7-0ubuntu0.22.04.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.13-10ubuntu5",
"5.2-1ubuntu1",
"5.2-1ubuntu3",
"5.2-1ubuntu4",
"5.2-1ubuntu4.1",
"5.2-1ubuntu4.2",
"5.2-1ubuntu4.3",
"5.7-0ubuntu0.22.04.1"
]
}
],
"aliases": [],
"details": "Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Due to a NULL pointer dereference bug Squid is vulnerable to a Denial of Service attack against Squid\u0027s Gopher gateway. The gopher protocol is always available and enabled in Squid prior to Squid 6.0.1. Responses triggering this bug are possible to be received from any gopher server, even those without malicious intent. Gopher support has been removed in Squid version 6.0.1. Users are advised to upgrade. Users unable to upgrade should reject all gopher URL requests.",
"id": "UBUNTU-CVE-2023-46728",
"modified": "2025-09-08T16:56:34Z",
"published": "2023-11-06T18:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-46728"
},
{
"type": "REPORT",
"url": "https://github.com/squid-cache/squid/security/advisories/GHSA-cg5h-v6vc-w33f"
},
{
"type": "REPORT",
"url": "https://megamansec.github.io/Squid-Security-Audit/gopher-nullpointer.html"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6500-1"
},
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-6500-2"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-46728"
}
],
"related": [
"USN-6500-1",
"USN-6500-2"
],
"schema_version": "1.7.0",
"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": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-46728"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
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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.
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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
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