CVE-2017-11103
What it is
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.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
- Exploit odds
- 5.1% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 5.1% in the next 30 days (EPSS).
- Severity: 8.1 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 5.1% · EPSS, next 30 days
- Weakness
- CWE-345
- Record status
- Modified
Affected
- Heimdal Project Heimdal < 7.4.0
- Freebsd
- Samba < 4.4.15
- Samba < 4.5.12
- Samba < 4.6.6
- Apple Iphone Os < 11.0
- Apple Mac Os X < 10.13.1
- Debian Linux 8.0
Attack profile CVSS 3.1 · 8.1
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2017-11103.md and follow it. Check whether this project is affected by CVE-2017-11103. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
References
- http://www.debian.org/security/2017/dsa-3912
- http://www.h5l.org/advisories.html?show=2017-07-11
- http://www.securityfocus.com/bid/99551
- http://www.securitytracker.com/id/1038876
- http://www.securitytracker.com/id/1039427
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
- https://support.apple.com/HT208112
- https://support.apple.com/HT208144
- https://support.apple.com/HT208221
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
- https://www.orpheus-lyre.info/
- https://www.samba.org/samba/security/CVE-2017-11103.html
- http://www.debian.org/security/2017/dsa-3912
- http://www.h5l.org/advisories.html?show=2017-07-11
- http://www.securityfocus.com/bid/99551
- http://www.securitytracker.com/id/1038876
- http://www.securitytracker.com/id/1039427
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0
- https://support.apple.com/HT208112
- https://support.apple.com/HT208144
- https://support.apple.com/HT208221
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.asc
- https://www.orpheus-lyre.info/
- https://www.samba.org/samba/security/CVE-2017-11103.html