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 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 v3.1

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

CVSS v2.0

6.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:P

EPSS

5.12% chance of exploitation in the next 30 days, 92th percentile

Published

2017-07-13

Updated

2024-08-05

Proof-of-concept exploits (1)

• VenalityXT/Red-Team-Tactics2★ · 2025-12-13

References

• CVE Record
• NVD entry

Related

• CVE-2017-11101
• CVE-2017-11104
• CVE-2017-11100
• CVE-2017-11105
• CVE-2017-11099
• CVE-2017-11107