Vulnerability Name:

CVE-2017-17439 (CCN-136080)

Assigned:2017-10-10
Published:2017-10-10
Updated:2017-12-30
Summary: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.
CVSS v3 Severity:7.5 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:5.0 Medium (CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-476
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2017-17439

Source: CONFIRM
Type: UNKNOWN
http://h5l.org/advisories.html?show=2017-12-08

Source: CONFIRM
Type: UNKNOWN
http://www.h5l.org/pipermail/heimdal-announce/2017-December/000008.html

Source: MISC
Type: Third Party Advisory
http://www.h5l.org/pipermail/heimdal-discuss/2017-August/000259.html

Source: CCN
Type: Debian Bug report logs - #878144
CVE-2017-17439: Remote unauthenticated DoS in Heimdal-KDC 7.1

Source: CONFIRM
Type: Issue Tracking, Mailing List, Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=878144

Source: XF
Type: UNKNOWN
heimdal-kdc-cve201717439-dos(136080)

Source: CONFIRM
Type: Third Party Advisory
https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887

Source: CCN
Type: Heimdal GIT Repository
Remote unauthenticated DoS in Heimdal-KDC 7.1 #353

Source: CONFIRM
Type: Patch, Third Party Advisory
https://github.com/heimdal/heimdal/issues/353

Source: DEBIAN
Type: Third Party Advisory
DSA-4055

Vulnerable Configuration:Configuration 1:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*

    • Configuration 2:
  • cpe:/a:heimdal_project:heimdal:*:*:*:*:*:*:*:* (Version <= 7.4.0)

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:201717439
    V
    		CVE-2017-17439
    2022-06-30
    oval:org.opensuse.security:def:112644
    P
    		libheimdal-7.7.0-1.11 on GA media (Moderate)
    2022-01-17
    oval:org.opensuse.security:def:106125
    P
    		libheimdal-7.7.0-1.11 on GA media (Moderate)
    2021-10-01
    oval:com.ubuntu.bionic:def:2017174390000000
    V
    		CVE-2017-17439 on Ubuntu 18.04 LTS (bionic) - medium.
    2017-12-06
    oval:com.ubuntu.artful:def:201717439000
    V
    		CVE-2017-17439 on Ubuntu 17.10 (artful) - medium.
    2017-12-06
    oval:com.ubuntu.xenial:def:201717439000
    V
    		CVE-2017-17439 on Ubuntu 16.04 LTS (xenial) - medium.
    2017-12-06
    oval:com.ubuntu.xenial:def:2017174390000000
    V
    		CVE-2017-17439 on Ubuntu 16.04 LTS (xenial) - medium.
    2017-12-06
    oval:com.ubuntu.bionic:def:201717439000
    V
    		CVE-2017-17439 on Ubuntu 18.04 LTS (bionic) - medium.
    2017-12-06
    oval:com.ubuntu.cosmic:def:201717439000
    V
    		CVE-2017-17439 on Ubuntu 18.10 (cosmic) - medium.
    2017-12-06
    oval:com.ubuntu.cosmic:def:2017174390000000
    V
    		CVE-2017-17439 on Ubuntu 18.10 (cosmic) - medium.
    2017-12-06
    oval:com.ubuntu.trusty:def:201717439000
    V
    		CVE-2017-17439 on Ubuntu 14.04 LTS (trusty) - medium.
    2017-12-06
    BACK
    debian debian linux 9.0
    heimdal_project heimdal *