drucken bookmarks versenden konfigurieren admin pdf Sicherheit: Ausführen beliebiger Kommandos in NTP
Name: |
Ausführen beliebiger Kommandos in NTP |
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ID: |
200905-08 |
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Distribution: |
Gentoo |
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Plattformen: |
Keine Angabe |
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Datum: |
Di, 26. Mai 2009, 18:14 |
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Referenzen: |
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0159
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1252 |
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Applikationen: |
NTP |
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Originalnachricht |
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200905-08 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: High Title: NTP: Remote execution of arbitrary code Date: May 26, 2009 Bugs: #263033, #268962 ID: 200905-08
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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 ------------------------------------------------------------------- 1 net-misc/ntp < 4.2.4_p7 >=3D 4.2.4_p7
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 ">=3Dnet-misc/ntp-4.2.4_p7"
References ==========
[ 1 ] CVE-2009-0159 http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-0159 [ 2 ] CVE-2009-1252 http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1252
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 http://bugs.gentoo.org.
License =======
Copyright 2009 Gentoo Foundation, Inc; referenced text belongs to its owner(s).
The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.5
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