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Ubuntu: (Multiple Advisories) (CVE-2017-11103): Samba vulnerability

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Ubuntu: (Multiple Advisories) (CVE-2017-11103): Samba vulnerability

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
07/12/2017
Created
07/25/2018
Added
07/15/2017
Modified
03/02/2020

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.

Solution(s)

  • ubuntu-upgrade-libkrb5-26-heimdal
  • ubuntu-upgrade-libsmbclient
  • ubuntu-upgrade-samba-libs

References

  • USN-3353-1
  • USN-3353-2
  • USN-3353-3
  • USN-3353-4
  • DSA-3909
  • DSA-3912
  • CVE-2017-11103
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