| Name | CVE-2017-17439 |
| 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more) |
| References | DSA-4055-1 |
| NVD severity | medium |
| Debian Bugs | 878144 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| heimdal (PTS) | stretch (security), stretch | 7.1.0+dfsg-13+deb9u3 | fixed |
| buster | 7.5.0+dfsg-3 | fixed | |
| bullseye, sid | 7.7.0+dfsg-2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| heimdal | source | wheezy | (not affected) | |||
| heimdal | source | jessie | (not affected) | |||
| heimdal | source | stretch | 7.1.0+dfsg-13+deb9u2 | DSA-4055-1 | ||
| heimdal | source | (unstable) | 7.5.0+dfsg-1 | 878144 |
[jessie] - heimdal <not-affected> (Vulnerability introduced in 7.0)
[wheezy] - heimdal <not-affected> (Vulnerability introduced in 7.0)
https://github.com/heimdal/heimdal/issues/353
Fixed by: https://github.com/heimdal/heimdal/commit/749d377fa357351a7bbba51f8aae72cdf0629592 (7.1)
Fixed by: https://github.com/heimdal/heimdal/commit/1a6a6e462dc2ac6111f9e02c6852ddec4849b887 (master)