CVE-2015-5300

Description

The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greater than 128 milliseconds by default, which allows remote attackers to set NTP to an arbitrary time when started with the -g option, or to alter the time by up to 900 seconds otherwise by responding to an unspecified number of requests from trusted sources, and leveraging a resulting denial of service (abort and restart).

Gravité et risque d'exploitation

CVE-2015-5300 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 9.13 %, ce qui la place devant 95.3 % des CVE référencées.

Que faire ?

• Vérifiez si le produit concerné est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• http://rhn.redhat.com/errata/RHSA-2015-1930.html
• http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
• http://seclists.org/bugtraq/2016/Feb/164
• http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
• http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
• http://www.ubuntu.com/usn/USN-2783-1
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html
• https://ics-cert.us-cert.gov/advisories/ICSA-15-356-01
• https://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
• http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p5_Securit
• https://bugzilla.redhat.com/show_bug.cgi?id=1271076
• https://www-01.ibm.com/support/docview.wss?uid=swg21980676
• https://support.citrix.com/article/CTX220112
• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170926.html
• https://www.ibm.com/support/home/docdisplay?lndocid=migr-5099428
• http://lists.fedoraproject.org/pipermail/package-announce/2015-November/170684.html
• http://www.debian.org/security/2015/dsa-3388
• https://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
• http://aix.software.ibm.com/aix/efixes/security/ntp_advisory5.asc
• https://www.cs.bu.edu/~goldbe/NTPattack.html
• http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
• http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177507.html
• http://www.securitytracker.com/id/1034670
• https://www-01.ibm.com/support/docview.wss?uid=isg3T1024073
• http://www.securityfocus.com/bid/77312
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
• https://www.freebsd.org/security/advisories/FreeBSD-SA-16:02.ntp.asc
• https://www-01.ibm.com/support/docview.wss?uid=swg21979393
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html
• https://www-01.ibm.com/support/docview.wss?uid=nas8N1021264
• http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
• https://www-01.ibm.com/support/docview.wss?uid=isg3T1023885
• https://bto.bluecoat.com/security-advisory/sa113
• https://www-01.ibm.com/support/docview.wss?uid=swg21983501
• https://www-01.ibm.com/support/docview.wss?uid=ssg1S1005821
• http://support.ntp.org/bin/view/Main/NtpBug2956
• https://www-01.ibm.com/support/docview.wss?uid=swg21983506
• http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html
• https://security.netapp.com/advisory/ntap-20171004-0001/