Scientific Linux Security Update : ntp on SL7.x x86_64

This script is Copyright (C) 2016-2017 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

Security Fix(es) :

- 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, CVE-2015-7692,
CVE-2015-7702)

- 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)

- 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 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)

- 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, CVE-2015-7703)

- 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)

- 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 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)

The CVE-2015-5219 and CVE-2015-7703 issues were discovered by Miroslav
Lichvr (Red Hat).

Additional Changes :

See also :

http://www.nessus.org/u?849a4dc3
https://www.tenable.com/security/research/tra-2015-04

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)

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