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[3.7] heimdal: NULL pointer dereference via crafted UDP packets (CVE-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 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.
References:
https://github.com/heimdal/heimdal/issues/353
https://nvd.nist.gov/vuln/detail/CVE-2017-17439
Patch:
https://github.com/heimdal/heimdal/commit/749d377fa357351a7bbba51f8aae72cdf0629592
(from redmine: issue id 8292, created on 2017-12-14, closed on 2018-01-02)
- Relations:
- parent #8290 (closed)
- Changesets:
- Revision 1061d3a8 on 2017-12-29T11:06:05Z:
main/heimdal: security fix (CVE-2017-17439)
Fixes #8292