GLSA 200905-08: NTP: Remote execution of arbitrary code

http://security.gentoo.org/

Severity:	high
Title:	NTP: Remote execution of arbitrary code
Date:	05/26/2009
Bugs:	#263033, #268962
ID:	200905-08

Synopsis

Multiple errors in the NTP client and server programs might allow for the remote execution of arbitrary code.

Background

NTP contains the client and daemon implementations for the Network Time Protocol.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-misc/ntp	< 4.2.4_p7	>= 4.2.4_p7	All supported architectures

Description

Multiple vulnerabilities have been found in the programs included in the NTP package:

Apple Product Security reported a boundary error in the cookedprint() function in ntpq/ntpq.c, possibly leading to a stack-based buffer overflow (CVE-2009-0159).
Chris Ries of CMU reported a boundary error within the crypto_recv() function in ntpd/ntp_crypto.c, possibly leading to a stack-based buffer overflow (CVE-2009-1252).

Impact

A remote attacker might send a specially crafted package to a machine running ntpd, possibly resulting in the remote execution of arbitrary code with the privileges of the user running the daemon, or a Denial of Service. NOTE: Successful exploitation requires the "autokey" feature to be enabled. This feature is only available if NTP was built with the 'ssl' USE flag.

Furthermore, a remote attacker could entice a user into connecting to a malicious server using ntpq, possibly resulting in the remote execution of arbitrary code with the privileges of the user running the application, or a Denial of Service.

Workaround

You can protect against CVE-2009-1252 by disabling the 'ssl' USE flag and recompiling NTP.

Resolution

All NTP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7"

References

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200905-08.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.