CVE-2017-11103

High

Published: 13/07/2017(UTC)Translated: 15/06/2026(UTC)NVD NIST

Summary

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.

Risk Assessment

This vulnerability creates a risk of successful server impersonation and other attacks, which can lead to serious security consequences for the organization.

Recommendation

It is recommended to upgrade to Heimdal version 7.4 or later to eliminate this vulnerability.

Other vulnerabilities in Heimdal

CVE-2017-6594High
The transit path validation code in Heimdal before 7.3 might allow attackers to bypass the capath policy protection mechanism by leveraging failure to add the previous hop realm to the transit path of issued tickets.

Original NVD description (English source)

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.