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TITLE:
NTP ntpd Autokey Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA35130

VERIFY ADVISORY:
http://secunia.com/advisories/35130/

DESCRIPTION:
A vulnerability has been reported in NTP, which can be exploited by
malicious people to cause a DoS (Denial of Service) or compromise a
vulnerable system.

The vulnerability is caused due to a boundary error within the
"crypto_recv()" function in ntpd/ntp_crypto.c. This can be exploited
to cause a stack-based buffer overflow via a specially crafted packet
sent to the "ntpd".

Successful exploitation allows execution of arbitrary code, but
requires that Autokey Authentication is configured via "crypto pw
[password]" in ntp.conf.

The vulnerability is reported in versions prior to 4.2.4p7.

SOLUTION:
Update to version 4.2.4p7.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Chris Ries of CMU.

ORIGINAL ADVISORY:
https://lists.ntp.org/pipermail/announce/2009-May/000062.html

OTHER REFERENCES:
US-CERT VU#853097:
http://www.kb.cert.org/vuls/id/853097

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