ubuntu-cve-2023-3326
Vulnerability from osv_ubuntu
Published
2023-06-22 17:15
Modified
2026-07-08 20:38
Summary
Details
pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.
Severity
9.8 (Critical)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-heimdal",
"binary_version": "4.6-2ubuntu0.1~esm1"
},
{
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},
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},
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},
{
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},
{
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},
{
"binary_name": "sssd-kcm",
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},
{
"binary_name": "sssd-krb5",
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},
{
"binary_name": "sssd-krb5-common",
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},
{
"binary_name": "sssd-ldap",
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},
{
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{
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{
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}
]
},
"package": {
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},
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{
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{
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}
],
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}
],
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"2.9.1-2ubuntu3",
"2.9.2-1ubuntu2",
"2.9.4-1ubuntu1",
"2.9.4-1.1ubuntu3",
"2.9.4-1.1ubuntu5",
"2.9.4-1.1ubuntu6",
"2.9.4-1.1ubuntu6.1",
"2.9.4-1.1ubuntu6.2",
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]
},
{
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "libpam-krb5",
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}
]
},
"package": {
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},
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{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.11-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
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},
{
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},
{
"binary_name": "libpam-sss",
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},
{
"binary_name": "libsss-certmap0",
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},
{
"binary_name": "libsss-idmap0",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "libsss-nss-idmap0",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "libsss-sudo",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "python3-libipa-hbac",
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},
{
"binary_name": "python3-libsss-nss-idmap",
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},
{
"binary_name": "python3-sss",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-ad",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-ad-common",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-common",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-dbus",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-idp",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-ipa",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-kcm",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-krb5",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-krb5-common",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-ldap",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-passkey",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-proxy",
"binary_version": "2.10.1-2ubuntu5.3"
},
{
"binary_name": "sssd-tools",
"binary_version": "2.10.1-2ubuntu5.3"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "sssd",
"purl": "pkg:deb/ubuntu/sssd@2.10.1-2ubuntu5.3?arch=source\u0026distro=questing"
},
"ranges": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"2.10.1-2ubuntu5",
"2.10.1-2ubuntu5.1",
"2.10.1-2ubuntu5.2",
"2.10.1-2ubuntu5.3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libpam-heimdal",
"binary_version": "4.11-2build1"
},
{
"binary_name": "libpam-krb5",
"binary_version": "4.11-2build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libpam-krb5",
"purl": "pkg:deb/ubuntu/libpam-krb5@4.11-2build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
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{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"4.11-2",
"4.11-2build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libipa-hbac0t64",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "libnss-sss",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "libpam-sss",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "libsss-certmap0",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "libsss-idmap0",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "libsss-nss-idmap0",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "libsss-sudo",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "python3-libipa-hbac",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "python3-libsss-nss-idmap",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "python3-sss",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-ad",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-ad-common",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-common",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-dbus",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-idp",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-ipa",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-kcm",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-krb5",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-krb5-common",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-ldap",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-passkey",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-proxy",
"binary_version": "2.12.0-1ubuntu5.1"
},
{
"binary_name": "sssd-tools",
"binary_version": "2.12.0-1ubuntu5.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "sssd",
"purl": "pkg:deb/ubuntu/sssd@2.12.0-1ubuntu5.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.10.1-2ubuntu5",
"2.10.1-2ubuntu7",
"2.12.0-1ubuntu3",
"2.12.0-1ubuntu4",
"2.12.0-1ubuntu5",
"2.12.0-1ubuntu5.1"
]
}
],
"aliases": [],
"details": "pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.",
"id": "UBUNTU-CVE-2023-3326",
"modified": "2026-07-08T20:38:10Z",
"published": "2023-06-22T17:15:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-3326"
},
{
"type": "REPORT",
"url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc"
},
{
"type": "REPORT",
"url": "https://seclists.org/oss-sec/2023/q2/245"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-3326"
}
],
"related": [],
"schema_version": "1.7.0",
"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": "low",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2023-3326"
]
}
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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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