CVE-2017-17439
published 2017-12-06CVE-2017-17439: 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…
high7.5CVSS 3.0
AVNACLPRNUINSUCNINAH
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.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | debian_linux | — | — |
| debian | heimdal | < heimdal 7.5.0+dfsg-1 (bookworm) | heimdal 7.5.0+dfsg-1 (bookworm) |
| heimdal_project | heimdal | <= 7.4.0 | — |
| heimdal_project | heimdal | >= 0 < 7.5.0+dfsg-1 | 7.5.0+dfsg-1 |
| heimdal_project | heimdal | >= 0 < 7.5.0+dfsg-1 | 7.5.0+dfsg-1 |
| heimdal_project | heimdal | >= 0 < 7.5.0+dfsg-1 | 7.5.0+dfsg-1 |
| heimdal_project | heimdal | >= 0 < 7.5.0+dfsg-1 | 7.5.0+dfsg-1 |
CVSS provenance
nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
osv7.5HIGH