The remote AIX host has a version of Network Time Protocol (NTP) installed that is affected by the following vulnerabilities :

  - A divide-by-zero error exists in file include/ntp.h     when handling LOGTOD and ULOGTOD macros in a crafted     NTP packet. An unauthenticated, remote attacker can     exploit this, via crafted NTP packets, to crash ntpd.
    (CVE 2015-5219)

  - A flaw exists in the ntp_crypto.c file due to improper     validation of the 'vallen' value in extension fields. An     unauthenticated, remote attacker can exploit this, via     specially crafted autokey packets, to disclose     sensitive information or cause a denial of service.
    (CVE-2015-7691)

  - A denial of service vulnerability exists in the autokey     functionality due to a failure in the crypto_bob2(),     crypto_bob3(), and cert_sign() functions to properly     validate the 'vallen' value. An unauthenticated, remote     attacker can exploit this, via specially crafted autokey     packets, to crash the NTP service. (CVE-2015-7692)

  - A denial of service vulnerability exists in the     crypto_recv() function in the file ntp_crypto.c related     to autokey functionality. An unauthenticated, remote     attacker can exploit this, via an ongoing flood of NTPv4     autokey requests, to exhaust memory resources.
    (CVE-2015-7701)

  - A denial of service vulnerability exists due to improper     validation of packets containing certain autokey     operations. An unauthenticated, remote attacker can     exploit this, via specially crafted autokey packets,     to crash the NTP service. (CVE-2015-7702)

  - A denial of service vulnerability exists due to a logic     flaw in the authreadkeys() function in the file     authreadkeys.c when handling extended logging where the     log and key files are set to be the same file. An     authenticated, remote attacker can exploit this, via a     crafted set of remote configuration requests, to cause     the NTP service to stop responding. (CVE-2015-7850)

  - A overflow condition exists in the     read_refclock_packet() function in the file ntp_io.c     when handling negative data lengths. A local attacker     can exploit this to crash the NTP service or possibly     gain elevated privileges. (CVE-2015-7853)

  - A denial of service vulnerability exists due to an     assertion flaw in the decodenetnum() function in the     file decodenetnum.c when handling long data values in     mode 6 and 7 packets. An unauthenticated, remote     attacker can exploit this to crash the NTP service.
    (CVE-2015-7855)

Detections

Analytics

AIX NTP v4 Advisory : ntp_advisory4.asc (IV79954) (IV79954)

critical Nessus Plugin ID 102322

Version 2.7

Version 2.6

Version 2.7 Dec 2, 2025, 10:53 PM CVSS metrics ("CVSSv2 score" set to 7.5) CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P") CVSS metrics ("CVSSv3 score" set to 9.8) CVSS metrics ("CVSSv3 vector" set to "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H") CVSSv2 score source (set to "CVE-2015-7853") Plugin Feed: 202512022253
Version 2.6 Apr 21, 2023, 8:33 PM Plugin metadata (adjusted see also links) Plugin Feed: 202304212033