CVE-2016-3120

The validateasrequest function in kdcutil.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrictanonymoustotgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

Database specific

{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "1.13"
                },
                {
                    "last_affected": "1.13"
                }
            ],
            "source": "CPE_STRING",
            "vendor_product": "mit:kerberos_5",
            "cpes": [
                "cpe:2.3:a:mit:kerberos_5:1.13:*:*:*:*:*:*:*"
            ]
        }
    ]
}

References

Affected packages

Git / github.com/krb5/krb5

Affected ranges

Type

GIT

Repo

https://github.com/krb5/krb5

Events

Introduced

3165ae71ba685ff0f105383a2c2a27a76e8efac4

Last affected

68a03305111126a183dbd3779497ed9e00be6e0a

Fixed

93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7

Database specific

{
    "source": [
        "CPE_STRING",
        "REFERENCES"
    ],
    "cpe": [
        "cpe:2.3:a:mit:kerberos_5:1.13:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.13.1:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.13.2:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.13.3:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.13.4:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.13.5:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.13.6:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.14:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.14.1:*:*:*:*:*:*:*",
        "cpe:2.3:a:mit:kerberos_5:1.14.2:*:*:*:*:*:*:*"
    ],
    "extracted_events": [
        {
            "introduced": "1.13"
        },
        {
            "last_affected": "1.13"
        },
        {
            "introduced": "1.13.1"
        },
        {
            "last_affected": "1.13.1"
        },
        {
            "introduced": "1.13.2"
        },
        {
            "last_affected": "1.13.2"
        },
        {
            "introduced": "1.13.3"
        },
        {
            "last_affected": "1.13.3"
        },
        {
            "introduced": "1.13.4"
        },
        {
            "last_affected": "1.13.4"
        },
        {
            "introduced": "1.13.5"
        },
        {
            "last_affected": "1.13.5"
        },
        {
            "introduced": "1.13.6"
        },
        {
            "last_affected": "1.13.6"
        },
        {
            "introduced": "1.14"
        },
        {
            "last_affected": "1.14"
        },
        {
            "introduced": "1.14.1"
        },
        {
            "last_affected": "1.14.1"
        },
        {
            "introduced": "1.14.2"
        },
        {
            "last_affected": "1.14.2"
        }
    ]
}

Affected versions

1.*

1.13

1.13.1

1.13.2

1.13.3

1.13.4

1.13.5

1.13.6

1.14

1.14.1

1.14.2

Database specific

vanir_signatures_modified

"2026-07-08T12:41:11Z"

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-3120.json"

vanir_signatures

[
    {
        "id": "CVE-2016-3120-5b944c3f",
        "digest": {
            "function_hash": "114832735742266611359956904032110077760",
            "length": 2440.0
        },
        "signature_version": "v1",
        "signature_type": "Function",
        "source": "https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7",
        "deprecated": false,
        "target": {
            "function": "validate_as_request",
            "file": "src/kdc/kdc_util.c"
        }
    },
    {
        "id": "CVE-2016-3120-9c22472c",
        "digest": {
            "line_hashes": [
                "188127353243240745192543305669040301596",
                "230037708568997149536374049167456462409",
                "300683140533483817075971560559028595358",
                "160102550585688257047493868450817751983"
            ],
            "threshold": 0.9
        },
        "signature_version": "v1",
        "signature_type": "Line",
        "source": "https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7",
        "deprecated": false,
        "target": {
            "file": "src/kdc/kdc_util.c"
        }
    }
]