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CVE-2017-11103

8.1 · HIGH

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.

Published Jul 13, 2017CWE-345EPSS 5.12%

Overview

CVE-2017-11103 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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.

References

Refwww.debian.org/security/2017/dsa-3912Refwww.h5l.org/advisories.html?show=2017-07-11Refwww.securityfocus.com/bid/99551Refwww.securitytracker.com/id/1038876Refwww.securitytracker.com/id/1039427GitHubgithub.com/heimdal/heimdal/releases/tag/heimdal-7.4.0Refsupport.apple.com/HT208112Refsupport.apple.com/HT208144Refsupport.apple.com/HT208221Refwww.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc

How CyberStrike helps

Frequently asked questions

What is CVE-2017-11103?

CVE-2017-11103 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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 is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-11103 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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