CVE-2017-17439
Fixed in a distro release EPSS 3%
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.
Products: debian_linux, heimdal_project heimdal
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.10 | heimdal | 7.4.0-r2 |
| Alpine 3.11 | heimdal | 7.4.0-r2 |
| Alpine 3.12 | heimdal | 7.4.0-r2 |
| Alpine 3.13 | heimdal | 7.4.0-r2 |
| Alpine 3.14 | heimdal | 7.4.0-r2 |
| Alpine 3.15 | heimdal | 7.4.0-r2 |
| Alpine 3.16 | heimdal | 7.4.0-r2 |
| Alpine 3.17 | heimdal | 7.4.0-r2 |
| Alpine 3.18 | heimdal | 7.4.0-r2 |
| Alpine 3.19 | heimdal | 7.4.0-r2 |
| Alpine 3.20 | heimdal | 7.4.0-r2 |
| Alpine 3.21 | heimdal | 7.4.0-r2 |
| Alpine 3.22 | heimdal | 7.4.0-r2 |
| Alpine 3.23 | heimdal | 7.4.0-r2 |
| Alpine 3.24 | heimdal | 7.4.0-r2 |
| Alpine 3.6 | heimdal | 7.1.0-r2 |
| Alpine 3.7 | heimdal | 7.4.0-r2 |
| Alpine 3.8 | heimdal | 7.4.0-r2 |
| Alpine 3.9 | heimdal | 7.4.0-r2 |
| Debian 12 | heimdal | 7.5.0+dfsg-1 |
| Debian 13 | heimdal | 7.5.0+dfsg-1 |
| Debian 14 | heimdal | 7.5.0+dfsg-1 |
| Debian 9 | heimdal | 7.1.0+dfsg-13+deb9u2 |