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Servers and applications

CVE-2017-11103

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…

Severity
High 8.1
Published
13 Jul 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
4.4.15, 4.5.12, 4.6.6
Exploit chance
5.1% in the next 30 daysHigher than 92% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Insufficient verification of data authenticity (CWE-345)
Attack
Over the network · Only under certain conditions · No login needed · No user action needed
Attacker can
Read data · Change data · Take it down
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Sources
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.

From NVD.

Affected software

SoftwareAffected versions
SambaServers and applications · cpe:a:samba:samba
  • From 4.0.0 before 4.4.15
  • From 4.5.0 before 4.5.12
  • From 4.6.0 before 4.6.6

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-11103
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-11103