CVE-2017-11103

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.

Weakness classification

• CWE-345: Insufficient Verification of Data Authenticity

Primary references

• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Broken Link
• cve@mitre.org — Third Party Advisory, VDB Entry
• cve@mitre.org — Third Party Advisory, VDB Entry
• cve@mitre.org — Third Party Advisory, VDB Entry
• cve@mitre.org — Release Notes
• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Third Party Advisory
• cve@mitre.org — Third Party Advisory