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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.12% probability · 92th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-345
- Affected
- heimdal project/heimdal · freebsd/freebsd · samba/samba · apple/iphone os · apple/mac os x · debian/debian linux
- Source
- cve@mitre.org
EPSS 5.1% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.debian.org/security/2017/dsa-3912Third Party Advisory
- http://www.h5l.org/advisories.html?show=2017-07-11Broken Link
- http://www.securityfocus.com/bid/99551Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038876Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0Release Notes
- https://support.apple.com/HT208112Third Party Advisory
- https://support.apple.com/HT208144Third Party Advisory
- https://support.apple.com/HT208221Third Party Advisory
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.ascThird Party Advisory
- https://www.orpheus-lyre.info/Third Party Advisory
- https://www.samba.org/samba/security/CVE-2017-11103.htmlThird Party Advisory
- http://www.debian.org/security/2017/dsa-3912Third Party Advisory
- http://www.h5l.org/advisories.html?show=2017-07-11Broken Link
- http://www.securityfocus.com/bid/99551Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038876Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0Release Notes
- https://support.apple.com/HT208112Third Party Advisory
- https://support.apple.com/HT208144Third Party Advisory
- https://support.apple.com/HT208221Third Party Advisory
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.ascThird Party Advisory
- https://www.orpheus-lyre.info/Third Party Advisory
- https://www.samba.org/samba/security/CVE-2017-11103.htmlThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.