Heimdal before 7.4 allows remote attackers to impersonate services with...
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2017-11103
Credits & Attribution
No credits recorded in the NVD database.
References
- https://support.apple.com/HT208221
- http://www.debian.org/security/2017/dsa-3912
- https://support.apple.com/HT208144
- https://www.orpheus-lyre.info/
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
- http://www.securityfocus.com/bid/99551
- http://www.securitytracker.com/id/1039427
- https://www.samba.org/samba/security/CVE-2017-11103.html
- http://www.securitytracker.com/id/1038876
- https://support.apple.com/HT208112
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
- http://www.h5l.org/advisories.html?show=2017-07-11
More from heimdal project
View All →Affected Vendor
heimdal project
View all reports →Affected Software
Timeline
CVSS Vectors
Weaknesses (CWE)
No CWE data available
MITRE ATT&CK TTPs
No associated TTPs found for this vulnerability.