CVE-2017-11103
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (5.12%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 5.12% probability · 92th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-345
- Affected
- heimdal project/heimdal · freebsd/freebsd · samba/samba · apple/iphone os · apple/mac os x · debian/debian linux
- Source
- cve@mitre.org
References
- http://www.debian.org/security/2017/dsa-3912Third Party Advisory
- http://www.h5l.org/advisories.html?show=2017-07-11Broken Link
- http://www.securityfocus.com/bid/99551Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038876Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0Release Notes
- https://support.apple.com/HT208112Third Party Advisory
- https://support.apple.com/HT208144Third Party Advisory
- https://support.apple.com/HT208221Third Party Advisory
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.ascThird Party Advisory
- https://www.orpheus-lyre.info/Third Party Advisory
- https://www.samba.org/samba/security/CVE-2017-11103.htmlThird Party Advisory
- http://www.debian.org/security/2017/dsa-3912Third Party Advisory
- http://www.h5l.org/advisories.html?show=2017-07-11Broken Link
- http://www.securityfocus.com/bid/99551Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038876Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427Third Party Advisory, VDB Entry
- https://github.com/heimdal/heimdal/releases/tag/heimdal-7.4.0Release Notes
- https://support.apple.com/HT208112Third Party Advisory
- https://support.apple.com/HT208144Third Party Advisory
- https://support.apple.com/HT208221Third Party Advisory
- https://www.freebsd.org/security/advisories/FreeBSD-SA-17:05.heimdal.ascThird Party Advisory
- https://www.orpheus-lyre.info/Third Party Advisory
- https://www.samba.org/samba/security/CVE-2017-11103.htmlThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.