CVE-2016-0778

Description

The (1) roaming_read and (2) roaming_write functions in roaming_common.c in the client in OpenSSH 5.x, 6.x, and 7.x before 7.1p2, when certain proxy and forward options are enabled, do not properly maintain connection file descriptors, which allows remote servers to cause a denial of service (heap-based buffer overflow) or possibly have unspecified other impact by requesting many forwardings.

Gravité et risque d'exploitation

CVE-2016-0778 obtient un score CVSS de 8.1/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 20.90 %, ce qui la place devant 97.5 % 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

• https://blogs.sophos.com/2016/02/17/utm-up2date-9-354-released/
• http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00006.html
• https://blogs.sophos.com/2016/02/29/utm-up2date-9-319-released/
• http://lists.apple.com/archives/security-announce/2016/Mar/msg00004.html
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05247375
• http://www.securityfocus.com/archive/1/537295/100/0/threaded
• https://support.apple.com/HT206167
• http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176349.html
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10734
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05385680
• http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
• http://www.openssh.com/txt/release-7.1p2
• http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00014.html
• http://www.securityfocus.com/bid/80698
• http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176516.html
• https://bto.bluecoat.com/security-advisory/sa109
• http://www.securitytracker.com/id/1034671
• http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00013.html
• https://security.gentoo.org/glsa/201601-01
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
• http://www.openwall.com/lists/oss-security/2016/01/14/7
• http://seclists.org/fulldisclosure/2016/Jan/44
• http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00008.html
• http://packetstormsecurity.com/files/135273/Qualys-Security-Advisory-OpenSSH-Overflow-Leak.html
• http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00007.html
• http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00009.html
• http://www.ubuntu.com/usn/USN-2869-1
• https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05356388
• http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
• http://www.debian.org/security/2016/dsa-3446
• https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf