273 lines
11 KiB
JSON
273 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-87853",
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"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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"state": "PUBLISHED",
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"assignerShortName": "redhat",
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"dateReserved": "2026-09-09T13:00:35.698Z",
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"datePublished": "2026-09-09T16:06:25.638Z",
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"dateUpdated": "2026-11-11T12:58:51.396Z"
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},
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"containers": {
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"cna": {
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"title": "Sssd: sssd: idp authentication prefix comparison allows cross-user impersonation",
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"metrics": [
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{
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"other": {
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"content": {
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"value": "Moderate",
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"namespace": "https://access.redhat.com/security/updates/classification/"
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},
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"type": "Red Hat severity rating"
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}
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},
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{
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"cvssV3_1": {
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"attackComplexity": "HIGH",
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"attackVector": "NETWORK",
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"availabilityImpact": "HIGH",
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"baseScore": 7.5,
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"baseSeverity": "HIGH",
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"confidentialityImpact": "HIGH",
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"integrityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"scope": "UNCHANGED",
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"userInteraction": "NONE",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"version": "3.1"
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},
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"format": "CVSS"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"value": "A flaw was found in SSSD's IdP authentication provider. The eval_access_token_buf() function compares the OIDC subject identifier using strncmp() with the authenticated user's identifier length, performing a prefix comparison instead of an exact match. An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user."
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}
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],
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"affected": [
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 10",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "sssd",
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"defaultStatus": "affected",
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"versions": [
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{
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"version": "0:2.12.0-3.el10_2.2",
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"lessThan": "*",
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"versionType": "rpm",
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"status": "unaffected"
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}
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],
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"cpes": [
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"cpe:/o:redhat:enterprise_linux:10.2"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 10",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "sssd",
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"defaultStatus": "affected",
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"versions": [
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{
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"version": "0:2.13.1-3.el10_3",
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"lessThan": "*",
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"versionType": "rpm",
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"status": "unaffected"
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}
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],
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"cpes": [
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"cpe:/o:redhat:enterprise_linux:10.3"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 6",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "sssd",
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"defaultStatus": "unknown",
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"cpes": [
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"cpe:/o:redhat:rhel_els:6"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 7",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "sssd",
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"defaultStatus": "unaffected",
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"cpes": [
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"cpe:/o:redhat:rhel_els:7"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 8",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "sssd",
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"defaultStatus": "unaffected",
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"cpes": [
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"cpe:/a:redhat:enterprise_linux:8"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat Enterprise Linux 9",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "sssd",
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"defaultStatus": "unaffected",
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"cpes": [
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"cpe:/a:redhat:enterprise_linux:9"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat OpenShift Container Platform 4",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "openshift/ose-rhel-coreos-8",
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"defaultStatus": "unaffected",
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"cpes": [
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"cpe:/a:redhat:openshift:4"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat OpenShift Container Platform 4",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "openshift/ose-rhel-coreos-9",
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"defaultStatus": "unaffected",
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"cpes": [
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"cpe:/a:redhat:openshift:4"
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]
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},
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{
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"vendor": "Red Hat",
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"product": "Red Hat OpenShift Container Platform 5",
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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
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"packageName": "openshift/ose-rhel-coreos-9",
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"defaultStatus": "unaffected",
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"cpes": [
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"cpe:/a:redhat:openshift:5"
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]
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}
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],
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"references": [
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:77534",
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"name": "RHSA-2026:77534",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/errata/RHSA-2026:98559",
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"name": "RHSA-2026:98559",
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"tags": [
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"vendor-advisory",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://access.redhat.com/security/cve/CVE-2026-87853",
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"tags": [
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"vdb-entry",
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"x_refsource_REDHAT"
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]
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},
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{
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2530888",
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"name": "RHBZ#2530888",
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"tags": [
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"issue-tracking",
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"x_refsource_REDHAT"
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]
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}
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],
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"datePublic": "2026-09-09T14:15:45.513Z",
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-187",
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"description": "Partial String Comparison",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"x_redhatCweChain": "CWE-187: Partial String Comparison",
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"workarounds": [
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{
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"lang": "en",
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"value": "Deployments not using the IdP authentication provider (idp_type = keycloak) are not affected. For affected deployments: (1) If using Keycloak LDAP federation, switching to Import Users: enabled mode causes Keycloak to assign random UUIDs as sub claims, making prefix collisions astronomically unlikely. (2) Restrict PAM login to specific users via simple_allow_users or access_provider = simple. (3) Disable Keycloak self-registration to prevent attackers from creating accounts with chosen prefix usernames."
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}
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],
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"timeline": [
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{
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"lang": "en",
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"time": "2026-09-06T00:00:00.000Z",
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"value": "Reported to Red Hat."
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},
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{
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"lang": "en",
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"time": "2026-09-09T14:15:45.513Z",
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"value": "Made public."
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}
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],
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"credits": [
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{
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"lang": "en",
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"value": "Red Hat would like to thank Moritz Theile for reporting this issue."
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}
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],
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"providerMetadata": {
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"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
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"shortName": "redhat",
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"dateUpdated": "2026-11-11T12:58:51.396Z"
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},
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"x_generator": {
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"engine": "cvelib 1.8.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-09-09T18:28:46.606582Z",
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"id": "CVE-2026-87853",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-09-10T14:56:49.929Z"
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}
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}
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]
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}
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} |