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AUSCERT External Security Bulletin Redistribution
ESB-2018.1993
NTP vulnerabilities patched in Ubuntu
10 July 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: NTP
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-7185 CVE-2018-7184 CVE-2018-7183
CVE-2018-7182
Reference: ASB-2018.0096
ESB-2018.0866.2
ESB-2018.0679
Original Bulletin:
http://www.ubuntu.com/usn/usn-3707-1
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Ubuntu Security Notice USN-3707-1
July 09, 2018
ntp vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- - Ubuntu 18.04 LTS
- - Ubuntu 17.10
- - Ubuntu 16.04 LTS
- - Ubuntu 14.04 LTS
Summary:
Several security issues were fixed in NTP.
Software Description:
- - ntp: Network Time Protocol daemon and utility programs
Details:
Yihan Lian discovered that NTP incorrectly handled certain malformed mode 6
packets. A remote attacker could possibly use this issue to cause ntpd to
crash, resulting in a denial of service. This issue only affected Ubuntu
17.10 and Ubuntu 18.04 LTS. (CVE-2018-7182)
Michael Macnair discovered that NTP incorrectly handled certain responses.
A remote attacker could possibly use this issue to execute arbitrary code.
(CVE-2018-7183)
Miroslav Lichvar discovered that NTP incorrectly handled certain
zero-origin timestamps. A remote attacker could possibly use this issue to
cause a denial of service. This issue only affected Ubuntu 17.10 and Ubuntu
18.04 LTS. (CVE-2018-7184)
Miroslav Lichvar discovered that NTP incorrectly handled certain
zero-origin timestamps. A remote attacker could possibly use this issue to
cause a denial of service. (CVE-2018-7185)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS:
ntp 1:4.2.8p10+dfsg-5ubuntu7.1
Ubuntu 17.10:
ntp 1:4.2.8p10+dfsg-5ubuntu3.3
Ubuntu 16.04 LTS:
ntp 1:4.2.8p4+dfsg-3ubuntu5.9
Ubuntu 14.04 LTS:
ntp 1:4.2.6.p5+dfsg-3ubuntu2.14.04.13
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/usn/usn-3707-1
CVE-2018-7182, CVE-2018-7183, CVE-2018-7184, CVE-2018-7185
Package Information:
https://launchpad.net/ubuntu/+source/ntp/1:4.2.8p10+dfsg-5ubuntu7.1
https://launchpad.net/ubuntu/+source/ntp/1:4.2.8p10+dfsg-5ubuntu3.3
https://launchpad.net/ubuntu/+source/ntp/1:4.2.8p4+dfsg-3ubuntu5.9
https://launchpad.net/ubuntu/+source/ntp/1:4.2.6.p5+dfsg-3ubuntu2.14.04.13
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