CVE-2018-20217

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Source
https://nvd.nist.gov/vuln/detail/CVE-2018-20217
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-20217.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2018-20217
Downstream
Related
Published
2018-12-26T21:29:02Z
Modified
2025-10-13T04:34:00Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.

References

Affected packages

Git / github.com/krb5/krb5

Affected ranges

Type
GIT
Repo
https://github.com/krb5/krb5
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
5e6d1796106df8ba6bc1973ee0917c170d929086

Database specific 

{
    "vanir_signatures": [
        {
            "digest": {
                "length": 2237.0,
                "function_hash": "281632458950095218231934864773643278513"
            },
            "id": "CVE-2018-20217-2b9be4ce",
            "signature_version": "v1",
            "deprecated": false,
            "signature_type": "Function",
            "target": {
                "function": "kdc_process_s4u2self_req",
                "file": "src/kdc/kdc_util.c"
            },
            "source": "https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086"
        },
        {
            "digest": {
                "length": 1519.0,
                "function_hash": "22009747526011531247411191432701765815"
            },
            "id": "CVE-2018-20217-9deb1157",
            "signature_version": "v1",
            "deprecated": false,
            "signature_type": "Function",
            "target": {
                "function": "s4u_identify_user",
                "file": "src/lib/krb5/krb/s4u_creds.c"
            },
            "source": "https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086"
        },
        {
            "digest": {
                "line_hashes": [
                    "275169878082459207433134400309769904522",
                    "325437437607260974550496749957866301197",
                    "211459628144645672959958375863273568099"
                ],
                "threshold": 0.9
            },
            "id": "CVE-2018-20217-b4599e87",
            "signature_version": "v1",
            "deprecated": false,
            "signature_type": "Line",
            "target": {
                "file": "src/kdc/kdc_util.c"
            },
            "source": "https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086"
        },
        {
            "digest": {
                "line_hashes": [
                    "128921040204504305593903249595158023063",
                    "204304021945698355911099436541501299156",
                    "253680059342113239776293698208297650928",
                    "35772295698068732454334995534124366979"
                ],
                "threshold": 0.9
            },
            "id": "CVE-2018-20217-e4d34f09",
            "signature_version": "v1",
            "deprecated": false,
            "signature_type": "Line",
            "target": {
                "file": "src/lib/krb5/krb/s4u_creds.c"
            },
            "source": "https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086"
        }
    ]
}