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CVE-2017-17439 REJECTED

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.

EPSS 9.18% · 92.6th percentile

Risk Scores

EPSS Score
9.18%
92.6th percentile

Affected Products

VendorProductVersions
Ubuntu:18.04:LTSheimdal0, 7.4.0.dfsg.1-2

Timeline

References

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