Test Kennung:	1.3.6.1.4.1.25623.1.1.10.2016.0414
Kategorie:	Mageia Linux Local Security Checks
Titel:	Mageia: Security Advisory (MGASA-2016-0414)
Zusammenfassung:	The remote host is missing an update for the 'ntp' package(s) announced via the MGASA-2016-0414 advisory.
Beschreibung:	Summary: The remote host is missing an update for the 'ntp' package(s) announced via the MGASA-2016-0414 advisory. Vulnerability Insight: When ntpd is configured with rate limiting for all associations (restrict default limited in ntp.conf), the limits are applied also to responses received from its configured sources. An attacker who knows the sources (e.g., from an IPv4 refid in server response) and knows the system is (mis)configured in this way can periodically send packets with spoofed source address to keep the rate limiting activated and prevent ntpd from accepting valid responses from its sources (CVE-2016-7426). When ntpd receives a server response on a socket that corresponds to a different interface than was used for the request, the peer structure is updated to use the interface for new requests. If ntpd is running on a host with multiple interfaces in separate networks and the operating system doesn't check source address in received packets (e.g. rp_filter on Linux is set to 0), an attacker that knows the address of the source can send a packet with spoofed source address which will cause ntpd to select wrong interface for the source and prevent it from sending new requests until the list of interfaces is refreshed, which happens on routing changes or every 5 minutes by default. If the attack is repeated often enough (once per second), ntpd will not be able to synchronize with the source (CVE-2016-7429). An exploitable configuration modification vulnerability exists in the control mode (mode 6) functionality of ntpd. If, against long-standing BCP recommendations, 'restrict default noquery ...' is not specified, a specially crafted control mode packet can set ntpd traps, providing information disclosure and DDoS amplification, and unset ntpd traps, disabling legitimate monitoring. A remote, unauthenticated, network attacker can trigger this vulnerability (CVE-2016-9310). If trap service, disabled by default, has been explicitly enabled, an attacker can send a specially crafted packet to cause a null pointer dereference that will crash ntpd, resulting in a denial of service (CVE-2016-9311). Affected Software/OS: 'ntp' package(s) on Mageia 5. Solution: Please install the updated package(s). CVSS Score: 7.1 CVSS Vector: AV:N/AC:M/Au:N/C:N/I:N/A:C
Querverweis:	Common Vulnerability Exposure (CVE) ID: CVE-2016-7426 BugTraq ID: 94451 http://www.securityfocus.com/bid/94451 CERT/CC vulnerability note: VU#633847 https://www.kb.cert.org/vuls/id/633847 FreeBSD Security Advisory: FreeBSD-SA-16:39 https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc RedHat Security Advisories: RHSA-2017:0252 http://rhn.redhat.com/errata/RHSA-2017-0252.html http://www.securitytracker.com/id/1037354 https://usn.ubuntu.com/3707-2/ Common Vulnerability Exposure (CVE) ID: CVE-2016-7429 BugTraq ID: 94453 http://www.securityfocus.com/bid/94453 Common Vulnerability Exposure (CVE) ID: CVE-2016-9310 BugTraq ID: 94452 http://www.securityfocus.com/bid/94452 Common Vulnerability Exposure (CVE) ID: CVE-2016-9311 BugTraq ID: 94444 http://www.securityfocus.com/bid/94444
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