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vulnerability CVE-2014-6593 CVE-2015-0205

JSSE, CyaSSL, Mono, OpenSSL: clear text session via SKIP-TLS

Synthesis of the vulnerability

An attacker, who has a TLS server, can force the JSSE, CyaSSL, Mono or OpenSSL client/server to use a clear text session, in order to allow a third party to capture or alter exchanged data.
Impacted software: ArubaOS, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, FabricOS, Brocade Network Advisor, Cisco ATA, AnyConnect VPN Client, Cisco ACE, ASA, AsyncOS, Cisco ESA, IOS by Cisco, IronPort Email, IronPort Web, Nexus by Cisco, NX-OS, Cisco Prime Access Registrar, Prime Collaboration Assurance, Cisco Prime DCNM, Prime Infrastructure, Cisco Prime LMS, Prime Network Control Systems, Cisco PRSM, Cisco Router, Cisco IP Phone, Cisco MeetingPlace, Cisco WSA, Clearswift Email Gateway, Debian, BIG-IP Hardware, TMOS, Fedora, FreeBSD, HP-UX, AIX, IRAD, Tivoli Workload Scheduler, WebSphere MQ, Juniper J-Series, Junos OS, Junos Space, Junos Space Network Management Platform, NSM Central Manager, NSMXpress, Juniper SBR, McAfee Email Gateway, ePO, McAfee Web Gateway, Windows (platform) ~ not comprehensive, Data ONTAP, NetBSD, NetScreen Firewall, ScreenOS, Nodejs Core, Java OpenJDK, OpenSSL, openSUSE, Oracle Communications, Java Oracle, JavaFX, Solaris, pfSense, Puppet, RHEL, Slackware, Splunk Enterprise, stunnel, SUSE Linux Enterprise Desktop, SLES, Ubuntu, Unix (platform) ~ not comprehensive, vCenter Server, VMware vSphere.
Severity of this computer vulnerability: 2/4.
Consequences of an attack: data reading.
Attacker's origin: internet server.
Number of vulnerabilities in this bulletin: 2.
Creation date: 04/03/2015.
Revision date: 09/03/2015.
Références of this announce: 1699051, 1700706, 1701485, 9010028, ARUBA-PSA-2015-003, bulletinjan2015, c04517481, c04556853, c04580241, c04583581, CERTFR-2015-AVI-108, CERTFR-2015-AVI-146, CERTFR-2016-AVI-303, cisco-sa-20150310-ssl, cpujan2015, cpuoct2017, CTX216642, CVE-2014-6593, CVE-2015-0205, DSA-3125-1, DSA-3144-1, DSA-3147-1, FEDORA-2015-0512, FEDORA-2015-0601, FEDORA-2015-0983, FEDORA-2015-1075, FEDORA-2015-1150, FEDORA-2015-8251, FEDORA-2015-8264, FreeBSD-SA-15:01.openssl, HPSBUX03219, HPSBUX03244, HPSBUX03273, HPSBUX03281, JSA10679, MDVSA-2015:019, MDVSA-2015:033, MDVSA-2015:062, NetBSD-SA2015-006, NTAP-20150205-0001, openSUSE-SU-2015:0130-1, openSUSE-SU-2015:0190-1, openSUSE-SU-2015:1277-1, RHSA-2015:0066-01, RHSA-2015:0067-01, RHSA-2015:0068-01, RHSA-2015:0069-01, RHSA-2015:0079-01, RHSA-2015:0080-01, RHSA-2015:0085-01, RHSA-2015:0086-01, RHSA-2015:0133-01, RHSA-2015:0134-01, RHSA-2015:0135-01, RHSA-2015:0136-01, RHSA-2015:0263-01, RHSA-2015:0264-01, SA40015, SA88, SB10104, SB10108, SKIP-TLS, SOL16120, SOL16123, SOL16124, SOL16126, SOL16135, SOL16136, SOL16139, SPL-95203, SSA:2015-009-01, SSRT101859, SSRT101885, SSRT101951, SSRT101968, SUSE-SU-2015:0336-1, SUSE-SU-2015:0503-1, USN-2459-1, USN-2486-1, USN-2487-1, VIGILANCE-VUL-16300, VMSA-2015-0003, VMSA-2015-0003.1, VMSA-2015-0003.10, VMSA-2015-0003.11, VMSA-2015-0003.12, VMSA-2015-0003.13, VMSA-2015-0003.14, VMSA-2015-0003.15, VMSA-2015-0003.2, VMSA-2015-0003.3, VMSA-2015-0003.4, VMSA-2015-0003.5, VMSA-2015-0003.6, VMSA-2015-0003.8, VMSA-2015-0003.9.

Description of the vulnerability

The TLS protocol uses a series of messages which have to be exchanged between the client and the server, before establishing a secured session.

However, clients such as JSSE or CyaSSL accept if the server directly skips to the final state (CVE-2014-6593, first analyzed in VIGILANCE-VUL-16014). Moreover, servers such as Mono or OpenSSL accept if the client directly skips to the final state (CVE-2015-0205, first analyzed in VIGILANCE-VUL-15934).The established session thus uses no encryption.

An attacker, who has a TLS server, can therefore force the JSSE, CyaSSL, Mono or OpenSSL client/server to use a clear text session, in order to allow a third party to capture or alter exchanged data.
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