NULL Pointer Dereference

Affecting krb5 package, versions <1.14.3+dfsg-1

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NVD Description

Note: Versions mentioned in the description apply to the upstream krb5 package. See Remediation section below for Debian:9 relevant versions.

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

Remediation

Upgrade Debian:9 krb5 to version 1.14.3+dfsg-1 or higher.

References

CVSS Score

6.5
medium severity
  • Attack Vector
    Network
  • Attack Complexity
    Low
  • Privileges Required
    Low
  • User Interaction
    None
  • Scope
    Unchanged
  • Confidentiality
    None
  • Integrity
    None
  • Availability
    High
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVE
CVE-2016-3120
CWE
CWE-476
Snyk ID
SNYK-DEBIAN9-KRB5-395782
Disclosed
01 Aug, 2016
Published
01 Aug, 2016