Insufficient Verification of Data Authenticity Affecting samba package, versions <2:4.3.11+dfsg-0ubuntu0.16.04.9


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
2.92% (91st percentile)

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  • Snyk IDSNYK-UBUNTU1604-SAMBA-357230
  • published13 Jul 2017
  • disclosed13 Jul 2017

Introduced: 13 Jul 2017

CVE-2017-11103  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

Upgrade Ubuntu:16.04 samba to version 2:4.3.11+dfsg-0ubuntu0.16.04.9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream samba package and not the samba package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

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 Scores

version 3.1