vulnwire
8.1high

CVE-2017-11103

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

Published 9 y ago · modified 4 mo ago · JSON

CVSS
8.1
v3.1 · NVD
CISA KEV
No
not known exploited
EPSS
5.1%
percentile 92%
Public exploits
0
none known

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.

Exploit prediction (EPSS)

5.12% probability of exploitation in the next 30 days, higher than 92% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
NVD3.18.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD2.06.8AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-345 Insufficient Verification of Data Authenticity

References

  • support.apple.com /HT208221 · x_refsource_CONFIRM, x_transferred
  • debian.org /security/2017/dsa-3912 · vendor-advisory, x_refsource_DEBIAN, x_transferred
  • support.apple.com /HT208144 · x_refsource_CONFIRM, x_transferred
  • orpheus-lyre.info / · x_refsource_MISC, x_transferred
  • freebsd.org /security/advisories/FreeBSD-SA-17:05.heimdal.asc · vendor-advisory, x_refsource_FREEBSD, x_transferred
  • securityfocus.com /bid/99551 · vdb-entry, x_refsource_BID, x_transferred
  • securitytracker.com /id/1039427 · vdb-entry, x_refsource_SECTRACK, x_transferred
  • samba.org /samba/security/CVE-2017-11103.html · x_refsource_CONFIRM, x_transferred
  • securitytracker.com /id/1038876 · vdb-entry, x_refsource_SECTRACK, x_transferred
  • support.apple.com /HT208112 · x_refsource_CONFIRM, x_transferred
  • github.com /heimdal/heimdal/releases/tag/heimdal-7.4.0 · x_refsource_CONFIRM, x_transferred
  • h5l.org /advisories.html?show=2017-07-11 · x_refsource_CONFIRM, x_transferred

Sources

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