Vulnerability CVE-2017-11103


Published: 2017-07-13

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.

Type:

CWE-345

(Insufficient Verification of Data Authenticity)

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Samba -> Samba 
H5L -> Heimdal 
Freebsd -> Freebsd 

 References:
http://www.debian.org/security/2017/dsa-3912
http://www.h5l.org/advisories.html?show=2017-07-11
http://www.securityfocus.com/bid/99551
http://www.securitytracker.com/id/1038876
http://www.securitytracker.com/id/1039427
https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
https://support.apple.com/HT208112
https://support.apple.com/HT208144
https://support.apple.com/HT208221
https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
https://www.orpheus-lyre.info/
https://www.samba.org/samba/security/CVE-2017-11103.html

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