CVE-2015-1798
First published: Wed Apr 08 2015(Updated: )
The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the-middle attackers to spoof packets by omitting the MAC.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| NTP | <=4.2.7p444 |
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Reference Links
- http://bugs.ntp.org/show_bug.cgi?id=2779
- http://lists.apple.com/archives/security-announce/2015/Jun/msg00002.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155863.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155864.html
- http://lists.opensuse.org/opensuse-updates/2015-04/msg00052.html
- http://marc.info/?l=bugtraq&m=143213867103400&w=2
- http://rhn.redhat.com/errata/RHSA-2015-1459.html
- http://support.apple.com/kb/HT204942
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150408-ntpd
- http://tools.cisco.com/security/center/viewAlert.x?alertId=38276
- http://www.debian.org/security/2015/dsa-3223
- http://www.kb.cert.org/vuls/id/374268
- http://www.mandriva.com/security/advisories?name=MDVSA-2015:202
- http://www.oracle.com/technetwork/topics/security/bulletinapr2015-2511959.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://www.securityfocus.com/bid/73951
- http://www.securitytracker.com/id/1032032
- http://www.ubuntu.com/usn/USN-2567-1
- https://kc.mcafee.com/corporate/index?page=content&id=SB10114
- https://security.gentoo.org/glsa/201509-01
Frequently Asked Questions
What is the severity of CVE-2015-1798?
CVE-2015-1798 has a severity rating of medium, as it allows for man-in-the-middle attacks.
How do I fix CVE-2015-1798?
To fix CVE-2015-1798, you should upgrade to NTP version 4.2.8p2 or later.
Which versions of NTP are affected by CVE-2015-1798?
NTP versions prior to 4.2.8p2, specifically 4.2.7p444 and earlier, are affected by CVE-2015-1798.
What type of attack does CVE-2015-1798 facilitate?
CVE-2015-1798 facilitates man-in-the-middle attacks by allowing attackers to spoof packets.
Is there a workaround for CVE-2015-1798 until I can apply a patch?
The best approach is to implement secure configurations and monitoring, but upgrading is ultimately recommended as a fix.
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- agent/weakness
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- agent/event
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- collector/nvd-index
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- vendor/ntp
- canonical/ntp
- version/ntp/4.2.7p444