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computer vulnerability announce CVE-2015-3197

OpenSSL: using disabled SSLv2 ciphers

Synthesis of the vulnerability

An attacker can connect to a SSLv2 server with disabled ciphers in OpenSSL, in order to create a TLS session which is not secure.
Impacted products: Blue Coat CAS, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, Brocade Network Advisor, Brocade vTM, ASA, AsyncOS, Cisco ESA, Cisco IPS, Nexus by Cisco, NX-OS, Cisco CUCM, Cisco Manager Attendant Console, Cisco IP Phone, Black Diamond, ExtremeXOS, Summit, BIG-IP Hardware, TMOS, Fedora, FreeBSD, HP Switch, AIX, Tivoli Storage Manager, Juniper J-Series, Junos OS, Junos Space, NSM Central Manager, NSMXpress, McAfee Email Gateway, Data ONTAP 7-Mode, NetScreen Firewall, ScreenOS, Nodejs Core, OpenSSL, openSUSE, openSUSE Leap, Oracle Communications, Solaris, Puppet, RHEL, JBoss EAP by Red Hat, Slackware, stunnel, SUSE Linux Enterprise Desktop, SLES, VxWorks, X2GoClient.
Severity of this bulletin: 1/4.
Consequences of an intrusion: data reading.
Hacker's origin: internet client.
Creation date: 28/01/2016.
Références of this threat: 2003480, 2003620, 2003673, 9010060, BSA-2016-004, bulletinjan2016, c05390893, CERTFR-2016-AVI-041, cisco-sa-20160129-openssl, cpuoct2016, cpuoct2017, CVE-2015-3197, FEDORA-2016-527018d2ff, FEDORA-2016-e1234b65a2, FreeBSD-SA-16:11.openssl, HPESBHF03703, JSA10759, NTAP-20160201-0001, openSUSE-SU-2016:0362-1, openSUSE-SU-2016:0442-1, openSUSE-SU-2016:0627-1, openSUSE-SU-2016:0628-1, openSUSE-SU-2016:0637-1, openSUSE-SU-2016:0638-1, openSUSE-SU-2016:0640-1, openSUSE-SU-2016:0720-1, RHSA-2016:0372-01, RHSA-2016:0445-01, RHSA-2016:0446-01, RHSA-2016:0490-01, SA111, SB10203, SOL33209124, SOL64009378, SSA:2016-034-03, SUSE-SU-2016:0617-1, SUSE-SU-2016:0620-1, SUSE-SU-2016:0621-1, SUSE-SU-2016:0624-1, SUSE-SU-2016:0631-1, SUSE-SU-2016:0641-1, SUSE-SU-2016:0678-1, VIGILANCE-VUL-18837, VN-2016-002.

Description of the vulnerability

The OpenSSL library disables by default SSLv2, excepted if the SSL_OP_NO_SSLv2 option is used.

SSLv2 cipher algorithms can be disabled on the server. However, a malicious client can still use these algorithms.

An attacker can therefore connect to a SSLv2 server with disabled ciphers in OpenSSL, in order to create a TLS session which is not secure.
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