CVE-2017-17439

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Summary

CVECVE-2017-17439
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2017-12-06 15:29:00 UTC
Updated2025-04-20 01:37:25 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.0 7.5 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-476 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 9.0 All All All
Application Heimdal Project Heimdal All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Heimdal Software · GitHub af854a3a-2127-422b-91ae-364da2661108 www.h5l.org
Segfaults after receiving invalid AS-REQ af854a3a-2127-422b-91ae-364da2661108 www.h5l.org Third Party Advisory
Security: Avoid NULL structure pointer member dereference · heimdal/heimdal@1a6a6e4 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Third Party Advisory
#878144 - CVE-2017-17439: Remote unauthenticated DoS in Heimdal-KDC 7.1 - Debian Bug report logs af854a3a-2127-422b-91ae-364da2661108 bugs.debian.org Issue Tracking, Mailing List, Third Party Advisory
Remote unauthenticated DoS in Heimdal-KDC 7.1 · Issue #353 · heimdal/heimdal · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
Debian -- Security Information -- DSA-4055-1 heimdal af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
Heimdal security advisories af854a3a-2127-422b-91ae-364da2661108 h5l.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 500244 Alpine Linux Security Update for heimdal
  • 503992 Alpine Linux Security Update for heimdal
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