CVE-2016-2181

Description

The Anti-Replay feature in the DTLS implementation in OpenSSL before 1.1.0 mishandles early use of a new epoch number in conjunction with a large sequence number, which allows remote attackers to cause a denial of service (false-positive packet drops) via spoofed DTLS records, related to rec_layer_d1.c and ssl3_record.c.

Gravité et risque d'exploitation

CVE-2016-2181 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 22.63 %, ce qui la place devant 97.7 % 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://www.securityfocus.com/bid/92982
• https://www.tenable.com/security/tns-2016-20
• http://www.splunk.com/view/SP-CAAAPUE
• http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
• http://rhn.redhat.com/errata/RHSA-2016-1940.html
• http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2016-3090545.html
• https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40312
• http://www.splunk.com/view/SP-CAAAPSV
• http://www-01.ibm.com/support/docview.wss?uid=swg21995039
• http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
• https://www.tenable.com/security/tns-2016-16
• https://www.tenable.com/security/tns-2016-21
• http://www.securitytracker.com/id/1036690
• http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
• http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
• https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=1fb9fdc3027b27d8eb6a1e6a846435b070980770
• http://www.oracle.com/technetwork/topics/security/ovmbulletinoct2016-3090547.html
• https://bto.bluecoat.com/security-advisory/sa132
• http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:26.openssl.asc
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
• https://kc.mcafee.com/corporate/index?page=content&id=SB10215
• http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00011.html
• http://www.ubuntu.com/usn/USN-3087-1
• http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00012.html
• http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00029.html
• http://www.ubuntu.com/usn/USN-3087-2
• http://lists.opensuse.org/opensuse-security-announce/2017-10/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00031.html
• http://seclists.org/fulldisclosure/2017/Jul/31
• http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00005.html
• https://support.f5.com/csp/article/K59298921
• http://www.debian.org/security/2016/dsa-3673
• http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00023.html
• http://lists.opensuse.org/opensuse-security-announce/2018-02/msg00032.html
• http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2016-10/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2016-09/msg00024.html
• http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20170322-01-openssl-en
• https://www.arista.com/en/support/advisories-notices/security-advisories/1749-security-advisory-24
• https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf