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Vulnerability record · CVE-2017-11103 · published 13 July 2017

CVE-2017-11103: Heimdal project heimdal insufficient verification of data authenticity vulnerability

Heimdal Project · Heimdal

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.

8.1 CVSS 3.1 High EPSS 5.1% · top 7.9% CWE-345 · Insufficient verification of data authenticity
8.1CVSS 3.1 base score, v2 6.8
5.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
6Affected product versions listed by NVD
24References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

6 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 AdvisoryVDB Entry
http://www.securitytracker.com/id/1038876 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039427 Third Party AdvisoryVDB 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
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 AdvisoryVDB Entry
http://www.securitytracker.com/id/1038876 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1039427 Third Party AdvisoryVDB 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

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Source: NIST National Vulnerability Database (record CVE-2017-11103), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.