Upstream information

CVE-2017-17439 at MITRE

Description

In Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.

SUSE information

Overall state of this security issue: Does not affect SUSE products

This issue is currently rated as having important severity.

CVSS v2 Scores
  National Vulnerability Database
Base Score 5
Vector AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
SUSE Bugzilla entry: 1071675 [RESOLVED / FIXED]

SUSE Security Advisories:

List of released packages

Product(s) Fixed package version(s) References
openSUSE Leap 42.2
  • libheimdal >= 7.4.0-2.6.1
  • libheimdal-debuginfo >= 7.4.0-2.6.1
  • libheimdal-debugsource >= 7.4.0-2.6.1
  • libheimdal-devel >= 7.4.0-2.6.1
Patchnames:
openSUSE-2017-1364
openSUSE Leap 42.3
  • libheimdal >= 7.5.0-9.1
  • libheimdal-debuginfo >= 7.5.0-9.1
  • libheimdal-debugsource >= 7.5.0-9.1
  • libheimdal-devel >= 7.5.0-9.1
Patchnames:
openSUSE-2017-1364
openSUSE-2018-876