CVE-2017-11103 Detail

Current Description

Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in a way that violates the Kerberos 5 protocol specification. In _krb5_extract_ticket() the KDC-REP service name must be obtained from the encrypted version stored in 'enc_part' instead of the unencrypted version stored in 'ticket'. Use of the unencrypted version provides an opportunity for successful server impersonation and other attacks. NOTE: this CVE is only for Heimdal and other products that embed Heimdal code; it does not apply to other instances in which this part of the Kerberos 5 protocol specification is violated.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  8.1 HIGH
Vector:  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://www.debian.org/security/2017/dsa-3912 Third Party Advisory 
http://www.h5l.org/advisories.html?show=2017-07-11 Broken Link 
http://www.securityfocus.com/bid/99551 Third Party Advisory  VDB Entry 
http://www.securitytracker.com/id/1038876 Third Party Advisory  VDB Entry 
http://www.securitytracker.com/id/1039427 Third Party Advisory  VDB Entry 
https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0 Release Notes 
https://support.apple.com/HT208112 Third Party Advisory 
https://support.apple.com/HT208144 Third Party Advisory 
https://support.apple.com/HT208221 Third Party Advisory 
https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc Third Party Advisory 
https://www.orpheus-lyre.info/ Third Party Advisory 
https://www.samba.org/samba/security/CVE-2017-11103.html Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-345 Insufficient Verification of Data Authenticity cwe source acceptance level NIST  

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Change History

7 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2017-11103
NVD Published Date:
07/13/2017
NVD Last Modified:
11/07/2019
Source:
MITRE