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Fencer Vulns
high 8.1

CVE-2017-11103 json

Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in…

published 2017-07-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-2740

cvss
8.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.1%
EPSS 5.1% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

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.

Patch / fix

  • heimdal_project heimdal 7.4.0
  • samba samba 4.4.15, 4.5.12, 4.6.6
  • apple iphone_os 11.0
  • apple mac_os_x 10.13.1
  • samba Debian 14, Debian 13, Debian 12 2:4.6.5+dfsg-4
  • heimdal Debian 14, Debian 13, Debian 12 7.4.0.dfsg.1-1

debian advisories DEBIAN-CVE-2017-11103

  • samba Ubuntu 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.10
  • samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.9
  • heimdal Ubuntu 14.04 LTS 1.6~git20131207+dfsg-1ubuntu1.2
  • heimdal Ubuntu 16.04 LTS 1.7~git20150920+dfsg-4ubuntu1.16.04.1

ubuntu advisories UBUNTU-CVE-2017-11103

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +2 more 4.6.7+git.38.90b2cdb4f22-3.7.1
  • resource-agents SLE High Availability Extension 12 SP3 4.0.1+git.1495055229.643177f1-2.4.2

suse advisories SUSE-SU-2017:2237-1

  • samba openSUSE Tumbleweed 4.14.6+git.182.2205d5224e3-1.1

opensuse advisories openSUSE-SU-2024:11365-1

  • samba Alpine 3.3 4.2.14-r4
  • samba Alpine 3.4 4.4.14-r1
  • samba Alpine 3.5 4.5.10-r1
  • samba Alpine 3.6 4.6.4-r1
  • heimdal Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 7.4.0-r0
  • heimdal Alpine 3.4, Alpine 3.3 1.6_rc2-r5
  • heimdal Alpine 3.5 1.6_rc2-r6
  • heimdal Alpine 3.6 7.1.0-r1

alpine advisories ALPINE-CVE-2017-11103

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2017-11103 updated cvss 8.1

krb5: Metadata taken from the unauthenticated plaintext

  • Red Hat Enterprise Linux 5 krb5, samba Red Hat Enterprise Linux 6 krb5, samba, samba4, libkadm5, krb5-libs, samba4-dc, +24 more Red Hat Enterprise Linux 7 ctdb, krb5, samba, libkadm5, samba-dc, krb5-libs, +25 more Red Hat JBoss Enterprise Application Platform 6 krb5 Red Hat JBoss Enterprise Web Server 2 krb5 Red Hat JBoss Enterprise Web Server 3 krb5
    +1 more products
    Red Hat Storage 3 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +21 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

5.12% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.