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computer vulnerability bulletin CVE-2015-2613 CVE-2015-7940

Bouncy Castle, Oracle Java: disclosure of elliptic curve private keys

Synthesis of the vulnerability

An attacker can use a vulnerability in the elliptic curve implementation of Bouncy Castle and Oracle Java, in order to obtain sensitive information.
Vulnerable products: Bouncy Castle JCE, DCFM Enterprise, FabricOS, Brocade Network Advisor, Brocade vTM, Debian, Fedora, IRAD, WebSphere MQ, Juniper SBR, Mule ESB, SnapManager, Java OpenJDK, openSUSE, openSUSE Leap, Oracle Communications, Oracle Directory Server, Oracle Directory Services Plus, Oracle Fusion Middleware, Oracle GlassFish Server, Oracle Identity Management, Oracle Internet Directory, Oracle iPlanet Web Server, Java Oracle, JavaFX, Oracle OIT, Tuxedo, Oracle Virtual Directory, WebLogic, Oracle Web Tier, Ubuntu.
Severity of this weakness: 3/4.
Consequences of an attack: data reading.
Hacker's origin: internet client.
Number of vulnerabilities in this bulletin: 2.
Creation date: 22/10/2015.
Références of this bulletin: 1968485, 1972455, 9010041, 9010044, BSA-2016-002, CERTFR-2019-AVI-325, cpuapr2018, cpujan2017, cpujan2018, cpujan2019, cpujul2015, cpujul2017, cpujul2018, cpuoct2017, CVE-2015-2613, CVE-2015-7940, DSA-3417-1, FEDORA-2015-7d95466eda, JSA10939, NTAP-20150715-0001, NTAP-20151028-0001, openSUSE-SU-2015:1911-1, RHSA-2016:2035-01, RHSA-2016:2036-01, USN-3727-1, VIGILANCE-VUL-18168.

Description of the vulnerability

The Bouncy Castle and Oracle Java products implement algorithms based on elliptic curves.

However, if the client forces the server to compute a common secret based on points located outside the chosen curve, he can progressively guess the full server key.

An attacker can therefore use a vulnerability in the elliptic curve implementation of Bouncy Castle and Oracle Java, in order to obtain sensitive information.
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