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SYNTHESIS OF THE VULNERABILITY

A malicious NTP server can generate an overflow in the ntpq client.
Severity: 2/4

Consequences: user access/rights, denial of service of client
Provenance: intranet server

Means of attack: no proof of concept, no attack

Ability of attacker: expert (4/4)

Confidence: confirmed by the editor (5/5)

Diffusion of the vulnerable configuration: high (3/3)

Creation date: 14/04/2009

IMPACTED PRODUCTS

– Mandriva Corporate
– Mandriva Linux
– Mandriva Multi Network Firewall
– Unix - plateform

DESCRIPTION OF THE VULNERABILITY

The ntpq program monitors the behaviour of the ntpd daemon, or
obtains information about peers.

The cookedprint() function of the NTP.org:ntpq/ntpq.c file
displays information about peers. However, this function uses
sprintf() on a buffer shorter than data. A buffer overflow of two
bytes thus occurs.

A malicious NTP server can therefore return a large value in order
to generate an overflow in ntpq. This overflow leads to a denial
of service, and may lead to code execution.

CHARACTERISTICS

Identifiers: BID-34481, CVE-2009-0159, MDVSA-2009:092,
VIGILANCE-VUL-8624

http://vigilance.fr/vulnerability/NTP-org-buffer-overflow-of-ntpq-8624