CVE-2017-17439
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Heimdal
PublishedDec 6, 2017
First seenDec 6, 2017
How to fix
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| heimdal_project heimdal | v ≤ 7.4.0 | — |
| debian debian_linux | 9.0 | — |
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