EulerOS 2.0 SP1 : ntp (EulerOS-SA-2016-1060)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote EulerOS host is missing multiple security updates.

Description :

According to the versions of the ntp packages installed, the EulerOS
installation on the remote host is affected by the following
vulnerabilities :

- It was found that ntpd could crash due to an
uninitialized variable when processing malformed
logconfig configuration commands.(CVE-2015-5194)

- It was found that ntpd would exit with a segmentation
fault when a statistics type that was not enabled
during compilation (e.g. timingstats) was referenced by
the statistics or filegen configuration
command.(CVE-2015-5195)

- It was found that NTP's :config command could be used
to set the pidfile and driftfile paths without any
restrictions. A remote attacker could use this flaw to
overwrite a file on the file system with a file
containing the pid of the ntpd process (immediately) or
the current estimated drift of the system clock (in
hourly intervals).(CVE-2015-5196)

- It was discovered that the sntp utility could become
unresponsive due to being caught in an infinite loop
when processing a crafted NTP packet.(CVE-2015-5219)

- It was found that the fix for CVE-2014-9750 was
incomplete: three issues were found in the value length
checks in NTP's ntp_crypto.c, where a packet with
particular autokey operations that contained malicious
data was not always being completely validated. A
remote attacker could use a specially crafted NTP
packet to crash ntpd.(CVE-2015-7691)

- It was found that the fix for CVE-2014-9750 was
incomplete: three issues were found in the value length
checks in NTP's ntp_crypto.c, where a packet with
particular autokey operations that contained malicious
data was not always being completely validated. A
remote attacker could use a specially crafted NTP
packet to crash ntpd.(CVE-2015-7692)

- A memory leak flaw was found in ntpd's CRYPTO_ASSOC. If
ntpd was configured to use autokey authentication, an
attacker could send packets to ntpd that would, after
several days of ongoing attack, cause it to run out of
memory.(CVE-2015-7701)

- It was found that the fix for CVE-2014-9750 was
incomplete: three issues were found in the value length
checks in NTP's ntp_crypto.c, where a packet with
particular autokey operations that contained malicious
data was not always being completely validated. A
remote attacker could use a specially crafted NTP
packet to crash ntpd.(CVE-2015-7702)

- It was found that NTP's :config command could be used
to set the pidfile and driftfile paths without any
restrictions. A remote attacker could use this flaw to
overwrite a file on the file system with a file
containing the pid of the ntpd process (immediately) or
the current estimated drift of the system clock (in
hourly intervals).(CVE-2015-7703)

- An off-by-one flaw, leading to a buffer overflow, was
found in cookedprint functionality of ntpq. A specially
crafted NTP packet could potentially cause ntpq to
crash.(CVE-2015-7852)

- A flaw was found in the way NTP verified trusted keys
during symmetric key authentication. An authenticated
client (A) could use this flaw to modify a packet sent
between a server (B) and a client (C) using a key that
is different from the one known to the client
(A).(CVE-2015-7974)

- A NULL pointer dereference flaw was found in the way
ntpd processed 'ntpdc reslist' commands that queried
restriction lists with a large amount of entries. A
remote attacker could potentially use this flaw to
crash ntpd.(CVE-2015-7977)

- A stack-based buffer overflow flaw was found in the way
ntpd processed 'ntpdc reslist' commands that queried
restriction lists with a large amount of entries. A
remote attacker could use this flaw to crash
ntpd.(CVE-2015-7978)

- It was found that when NTP was configured in broadcast
mode, a remote attacker could broadcast packets with
bad authentication to all clients. The clients, upon
receiving the malformed packets, would break the
association with the broadcast server, causing them to
become out of sync over a longer period of
time.(CVE-2015-7979)

- A flaw was found in the way the ntpq client processed
certain incoming packets in a loop in the getresponse()
function. A remote attacker could potentially use this
flaw to crash an ntpq client instance.(CVE-2015-8158)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

See also :

http://www.nessus.org/u?518aa2d6

Solution :

Update the affected ntp packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.4
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

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