CVE-2017-11103
8.1 · HIGHOverview
CVE-2017-11103 is a high-severity vulnerability affecting heimdal_project heimdal. It was published on July 13, 2017 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from heimdal_project. Update heimdal to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| heimdal_project | heimdal | >= 0, < 7.4.0 | Affected |
| samba | samba | >= 4.0.0, < 4.4.15 | Affected |
| apple | iphone_os | >= 0, < 11.0 | Affected |
| apple | mac_os_x | >= 0, < 10.13.1 | Affected |
References
Frequently Asked Questions
What is CVE-2017-11103?
CVE-2017-11103 is a high-severity vulnerability affecting heimdal_project heimdal. It was published on July 13, 2017 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2017-11103?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2017-11103?
Check the references section for vendor advisories and patches from heimdal_project. Update heimdal to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2017-11103?
CyberStrike's AI-powered security agents can automatically detect CVE-2017-11103 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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