THREATPORT/VULNERABILITY/CVE-2017-11103
HIGH SEVERITY

CVE-2017-11103

Heimdal vulnerability

CVSS
8.1
EPSS
5.1%
EPSS pct
92th
Exploited
No 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.
Affected vendor
Heimdal Project
Affected product
Heimdal
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-345 — Insufficient Verification of Data Authenticity
Published
2017-07-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, high attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 5.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 92% of all scored CVEs.

Check your external exposure to CVE-2017-11103

  • Confirm whether Heimdal Project Heimdal is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2017-11103.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-11103

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-11103 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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