Is CVE-2017-11103 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 5%.

What products does CVE-2017-11103 affect?

Tracked products affected include Samba. Check the version you run to see whether it is affected.

How do I fix CVE-2017-11103?

Apply the vendor fix promptly. Upgrade affected products to a fixed version.

CVE-2017-11103

Q: What is CVE-2017-11103?

CVE-2017-11103 is a high-severity software vulnerability (CWE-345) with a CVSS score of 8.1. 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 ser

HIGH severity · CVSS 8.1 · CWE-345

8.1CVSS HIGH

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityHigh

Privileges requiredNone

User interactionNone

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Exploit probability (EPSS)5%

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Samba

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

CVE-2017-11103

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information