Executive Summary

Informations
Name CVE-2017-17439 First vendor Publication 2017-12-06
Vendor Cve Last vendor Modification 2017-12-30

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Overall CVSS Score 7.5
Base Score 7.5 Environmental Score 7.5
impact SubScore 3.6 Temporal Score 7.5
Exploitabality Sub Score 3.9
 
Attack Vector Network Attack Complexity Low
Privileges Required None User Interaction None
Scope Unchanged Confidentiality Impact None
Integrity Impact None Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Cvss Base Score 5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Low
Cvss Expoit Score 10 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17439

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-476 NULL Pointer Dereference

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 1
Os 1

Snort® IPS/IDS

Date Description
2019-10-08 Heimdal KDC malformed as-req denial of service attempt
RuleID : 51400 - Revision : 1 - Type : SERVER-OTHER

Nessus® Vulnerability Scanner

Date Description
2018-01-15 Name : The remote Fedora host is missing a security update.
File : fedora_2017-f0e5ad250c.nasl - Type : ACT_GATHER_INFO
2018-01-10 Name : The remote Fedora host is missing a security update.
File : fedora_2017-2962e58478.nasl - Type : ACT_GATHER_INFO
2017-12-14 Name : The remote openSUSE host is missing a security update.
File : openSUSE-2017-1364.nasl - Type : ACT_GATHER_INFO
2017-12-08 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-4055.nasl - Type : ACT_GATHER_INFO

Sources (Detail)

Source Url
CONFIRM http://h5l.org/advisories.html?show=2017-12-08
http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878144
https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec484...
https://github.com/heimdal/heimdal/issues/353
DEBIAN https://www.debian.org/security/2017/dsa-4055
MISC http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html

Alert History

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Date Informations
2021-05-04 12:59:40
  • Multiple Updates
2021-04-22 02:12:35
  • Multiple Updates
2020-05-23 02:04:38
  • Multiple Updates
2020-05-23 00:58:18
  • Multiple Updates
2019-05-18 12:06:02
  • Multiple Updates
2017-12-30 09:22:05
  • Multiple Updates
2017-12-23 00:21:33
  • Multiple Updates
2017-12-15 13:23:45
  • Multiple Updates
2017-12-09 13:24:14
  • Multiple Updates
2017-12-09 09:22:23
  • Multiple Updates
2017-12-07 09:21:28
  • Multiple Updates
2017-12-06 22:57:01
  • First insertion