Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-345.
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. 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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* | before 7.4.0 | Vulnerable | Heimdal Project |
| cpe:2.3:o:freebsd:freebsd:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | FreeBSD |
| cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* | 4.0.0 to before 4.4.15; 4.5.0 to before 4.5.12; 4.6.0 to before 4.6.6 | Vulnerable | Samba |
| cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* | before 11.0 | Vulnerable | Apple |
| cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* | before 10.13.1 | Vulnerable | Apple |
| cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:heimdal_project:heimdal:*:*:*:*:*:*:*:* Versions before 7.4.0 Vulnerable ·Heimdal Project
- cpe:2.3:o:freebsd:freebsd:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·FreeBSD
- cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:* Versions 4.0.0 to before 4.4.15; 4.5.0 to before 4.5.12; 4.6.0 to before 4.6.6 Vulnerable ·Samba
- cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 11.0 Vulnerable ·Apple
- cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:* Versions before 10.13.1 Vulnerable ·Apple
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
Not affected: 7 products
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat JBoss Enterprise Application Platform 6
- Red Hat JBoss Enterprise Web Server 2
- Red Hat JBoss Enterprise Web Server 3
- Red Hat Storage 3
Timeline
- 2026-10-02 Threatist record created from CVE-2017-11103
- 2026-10-03 Alias added: GHSA-7cm4-q9wm-9w5g
References
Advisory 7
Sources
- CVE-2017-11103 · CVE Program
- CVE-2017-11103 · NVD
- FIRST EPSS
- GHSA-7cm4-q9wm-9w5g · GitHub Advisory Database · CC BY 4.0
- CVE-2017-11103 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences