Synopsis:          Moderate: ntp security and bug fix update

Advisory ID:       SLSA-2016:0780-1

Issue Date:        2016-05-10

CVE Numbers:       CVE-2015-5194

                   CVE-2015-5195

                   CVE-2015-7703

                   CVE-2015-5219

                   CVE-2015-7691

                   CVE-2015-7692

                   CVE-2015-7702

                   CVE-2015-7701

                   CVE-2015-7852

                   CVE-2015-7977

                   CVE-2015-7978

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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 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 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 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)



The CVE-2015-5219 and CVE-2015-7703 issues were discovered by Miroslav

Lichvr (Red Hat).

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SL6

  x86_64

    ntp-4.2.6p5-10.el6.x86_64.rpm

    ntp-debuginfo-4.2.6p5-10.el6.x86_64.rpm

    ntpdate-4.2.6p5-10.el6.x86_64.rpm

    ntp-perl-4.2.6p5-10.el6.x86_64.rpm

  i386

    ntp-4.2.6p5-10.el6.i686.rpm

    ntp-debuginfo-4.2.6p5-10.el6.i686.rpm

    ntpdate-4.2.6p5-10.el6.i686.rpm

    ntp-perl-4.2.6p5-10.el6.i686.rpm

  noarch

    ntp-doc-4.2.6p5-10.el6.noarch.rpm



- Scientific Linux Development Team