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{
"schema_version": "1.7.0",
"id": "USN-4233-2",
"summary": "gnutls28 update",
"details": "USN-4233-1 disabled SHA1 being used for digital signature operations in\nGnuTLS. In certain network environments, certificates using SHA1 may still\nbe in use. This update adds the %VERIFY_ALLOW_BROKEN and\n%VERIFY_ALLOW_SIGN_WITH_SHA1 priority strings that can be used to\ntemporarily re-enable SHA1 until certificates can be replaced with a\nstronger algorithm.\n\nOriginal advisory details:\n\n As a security improvement, this update marks SHA1 as being untrusted for\n digital signature operations.\n",
"aliases": [],
"upstream": [],
"related": [],
"published": "2020-01-23T16:57:09Z",
"modified": "2026-04-22T07:36:38Z",
"affected": [
{
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.4.10-4ubuntu1.7?arch=source&distro=xenial"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.4.10-4ubuntu1.7"
}
]
}
],
"versions": [
"3.3.15-5ubuntu2",
"3.3.18-1ubuntu1",
"3.3.20-1ubuntu1",
"3.4.9-2ubuntu1",
"3.4.10-4ubuntu1",
"3.4.10-4ubuntu1.1",
"3.4.10-4ubuntu1.2",
"3.4.10-4ubuntu1.3",
"3.4.10-4ubuntu1.4",
"3.4.10-4ubuntu1.5",
"3.4.10-4ubuntu1.6"
],
"ecosystem_specific": {
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.4.10-4ubuntu1.7"
},
{
"binary_name": "guile-gnutls",
"binary_version": "3.4.10-4ubuntu1.7"
},
{
"binary_name": "libgnutls-openssl27",
"binary_version": "3.4.10-4ubuntu1.7"
},
{
"binary_name": "libgnutls30",
"binary_version": "3.4.10-4ubuntu1.7"
},
{
"binary_name": "libgnutlsxx28",
"binary_version": "3.4.10-4ubuntu1.7"
}
],
"availability": "No subscription required"
},
"database_specific": {
"cves_map": {
"ecosystem": "Ubuntu:16.04:LTS",
"cves": []
}
}
},
{
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "gnutls28",
"purl": "pkg:deb/ubuntu/gnutls28@3.5.18-1ubuntu1.3?arch=source&distro=bionic"
},
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.5.18-1ubuntu1.3"
}
]
}
],
"versions": [
"3.5.8-6ubuntu3",
"3.5.17-1ubuntu1",
"3.5.17-1ubuntu3",
"3.5.18-1ubuntu1",
"3.5.18-1ubuntu1.1",
"3.5.18-1ubuntu1.2"
],
"ecosystem_specific": {
"binaries": [
{
"binary_name": "gnutls-bin",
"binary_version": "3.5.18-1ubuntu1.3"
},
{
"binary_name": "libgnutls-dane0",
"binary_version": "3.5.18-1ubuntu1.3"
},
{
"binary_name": "libgnutls-openssl27",
"binary_version": "3.5.18-1ubuntu1.3"
},
{
"binary_name": "libgnutls30",
"binary_version": "3.5.18-1ubuntu1.3"
},
{
"binary_name": "libgnutlsxx28",
"binary_version": "3.5.18-1ubuntu1.3"
}
],
"availability": "No subscription required"
},
"database_specific": {
"cves_map": {
"ecosystem": "Ubuntu:18.04:LTS",
"cves": []
}
}
}
],
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-4233-2"
},
{
"type": "REPORT",
"url": "https://launchpad.net/bugs/1860656"
}
]
}