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.
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
| Link | Tags |
|---|---|
| https://support.apple.com/HT208221 | third party advisory |
| http://www.debian.org/security/2017/dsa-3912 | third party advisory vendor advisory |
| https://support.apple.com/HT208144 | third party advisory |
| https://www.orpheus-lyre.info/ | third party advisory |
| https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc | third party advisory vendor advisory |
| http://www.securityfocus.com/bid/99551 | vdb entry third party advisory |
| http://www.securitytracker.com/id/1039427 | vdb entry third party advisory |
| https://www.samba.org/samba/security/CVE-2017-11103.html | third party advisory |
| http://www.securitytracker.com/id/1038876 | vdb entry third party advisory |
| https://support.apple.com/HT208112 | third party advisory |
| https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0 | release notes |
| http://www.h5l.org/advisories.html?show=2017-07-11 | broken link |