UBUNTU-CVE-2017-17439 (CVE-2017-17439)

Vulnerability from osv_ubuntu – Published: 2017-12-06 15:29 – Updated: 2025-07-16 04:53 – Source website
Withdrawn 2025-07-18 VLAI
Details

In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.

Severity
7.5 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "heimdal-clients",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-clients-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-dev",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-docs",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-kcm",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-kcm-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-kdc",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-kdc-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-multidev",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-multidev-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-servers",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "heimdal-servers-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libasn1-8-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libasn1-8-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libgssapi3-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libgssapi3-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libhcrypto4-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libhcrypto4-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libhdb9-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libhdb9-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libheimbase1-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libheimbase1-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libheimntlm0-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libheimntlm0-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libhx509-5-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libhx509-5-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkadm5clnt7-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkadm5clnt7-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkadm5srv8-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkadm5srv8-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkafs0-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkafs0-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkdc2-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkdc2-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkrb5-26-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libkrb5-26-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libotp0-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libotp0-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libroken18-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libroken18-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libsl0-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libsl0-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libwind0-heimdal",
            "binary_version": "7.5.0+dfsg-1"
          },
          {
            "binary_name": "libwind0-heimdal-dbgsym",
            "binary_version": "7.5.0+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "heimdal",
        "purl": "pkg:deb/ubuntu/heimdal@7.5.0+dfsg-1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.5.0+dfsg-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "7.4.0.dfsg.1-2"
      ]
    }
  ],
  "aliases": [],
  "details": "In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.",
  "id": "UBUNTU-CVE-2017-17439",
  "modified": "2025-07-16T04:53:10Z",
  "published": "2017-12-06T15:29:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2017-17439"
    },
    {
      "type": "REPORT",
      "url": "http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2017-17439"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2017-17439"
  ],
  "withdrawn": "2025-07-18T16:44:16Z"
}



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