The Vigil@nce team watches public vulnerabilities impacting your computers, and then offers security solutions, a database and tools to fix them.

Computer vulnerabilities of DCFM Enterprise

vulnerability alert CVE-2015-2590 CVE-2015-2596 CVE-2015-2597

Oracle Java: several vulnerabilities of July 2015

Synthesis of the vulnerability

Several vulnerabilities of Oracle Java were announced in July 2015.
Impacted products: DCFM Enterprise, FabricOS, Brocade Network Advisor, Brocade vTM, Debian, Avamar, BIG-IP Hardware, TMOS, Fedora, AIX, DB2 UDB, Domino, Notes, IRAD, SPSS Data Collection, SPSS Modeler, SPSS Statistics, Tivoli Storage Manager, Tivoli System Automation, WebSphere MQ, Junos Space, ePO, SnapManager, Java OpenJDK, openSUSE, Java Oracle, JavaFX, Puppet, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity: 3/4.
Consequences: user access/rights, data reading, data creation/edition, data deletion, denial of service on service, denial of service on client.
Provenance: document.
Number of vulnerabilities in this bulletin: 25.
Creation date: 15/07/2015.
Identifiers: 1963330, 1963331, 1963812, 1964236, 1966040, 1966536, 1967222, 1967498, 1967893, 1968485, 1972455, 206954, 9010041, 9010044, BSA-2016-002, CERTFR-2015-ALE-007, CERTFR-2015-AVI-305, CERTFR-2016-AVI-128, cpujul2015, CVE-2015-2590, CVE-2015-2596, CVE-2015-2597, CVE-2015-2601, CVE-2015-2613, CVE-2015-2619, CVE-2015-2621, CVE-2015-2625, CVE-2015-2627, CVE-2015-2628, CVE-2015-2632, CVE-2015-2637, CVE-2015-2638, CVE-2015-2659, CVE-2015-2664, CVE-2015-2808, CVE-2015-4000, CVE-2015-4729, CVE-2015-4731, CVE-2015-4732, CVE-2015-4733, CVE-2015-4736, CVE-2015-4748, CVE-2015-4749, CVE-2015-4760, DSA-3316-1, DSA-3339-1, ESA-2015-134, FEDORA-2015-11859, FEDORA-2015-11860, JSA10727, NTAP-20150715-0001, NTAP-20151028-0001, openSUSE-SU-2015:1288-1, openSUSE-SU-2015:1289-1, RHSA-2015:1228-01, RHSA-2015:1229-01, RHSA-2015:1230-01, RHSA-2015:1241-01, RHSA-2015:1242-01, RHSA-2015:1243-01, RHSA-2015:1485-01, RHSA-2015:1486-01, RHSA-2015:1488-01, RHSA-2015:1526-01, RHSA-2015:1544-01, SB10139, SOL17079, SOL17169, SOL17170, SOL17171, SOL17173, SUSE-SU-2015:1319-1, SUSE-SU-2015:1320-1, SUSE-SU-2015:1329-1, SUSE-SU-2015:1331-1, SUSE-SU-2015:1345-1, SUSE-SU-2015:1375-1, SUSE-SU-2015:1509-1, SUSE-SU-2015:2166-1, SUSE-SU-2015:2192-1, USN-2696-1, USN-2706-1, VIGILANCE-VUL-17371.

Description of the vulnerability

Several vulnerabilities were announced in Oracle Java.

An attacker can use a vulnerability of 2D, in order to obtain information, to alter information, or to trigger a denial of service (VIGILANCE-VUL-17558). [severity:3/4; CVE-2015-4760]

An attacker can use a vulnerability of CORBA, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-2628]

An attacker can use a vulnerability of JMX, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-4731]

An attacker can use a vulnerability of Libraries, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-2590]

An attacker can use a vulnerability of Libraries, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-4732]

An attacker can use a vulnerability of RMI, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-4733]

An attacker can use a vulnerability of 2D, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-2638]

An attacker can use a vulnerability of Deployment, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-4736]

An attacker can use a vulnerability of Security, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-4748]

An attacker can use a vulnerability of Install, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-2597]

An attacker can use a vulnerability of Deployment, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-2664]

An attacker can use a vulnerability of 2D, in order to obtain information. [severity:2/4; CVE-2015-2632]

An attacker can use a vulnerability of JCE, in order to obtain information. [severity:2/4; CVE-2015-2601]

An attacker can use a vulnerability of JCE, in order to obtain information (VIGILANCE-VUL-18168). [severity:2/4; CVE-2015-2613]

An attacker can use a vulnerability of JMX, in order to obtain information. [severity:2/4; CVE-2015-2621]

An attacker can use a vulnerability of Security, in order to trigger a denial of service. [severity:2/4; CVE-2015-2659]

An attacker can use a vulnerability of 2D, in order to obtain information. [severity:2/4; CVE-2015-2619]

An attacker can bypass security features in 2D, in order to obtain sensitive information. [severity:2/4; CVE-2015-2637]

An attacker can use a vulnerability of Hotspot, in order to alter information. [severity:2/4; CVE-2015-2596]

An attacker can use a vulnerability of JNDI, in order to trigger a denial of service. [severity:2/4; CVE-2015-4749]

An attacker can use a vulnerability of Deployment, in order to obtain or alter information. [severity:2/4; CVE-2015-4729]

An attacker can use a vulnerability of JSSE, in order to obtain or alter information. [severity:2/4; CVE-2015-4000]

An attacker can use a vulnerability of JSSE, in order to obtain or alter information. [severity:2/4; CVE-2015-2808]

An attacker can use a vulnerability of Install, in order to obtain information. [severity:1/4; CVE-2015-2627]

An attacker can use a vulnerability of JSSE, in order to obtain information. [severity:1/4; CVE-2015-2625]
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computer vulnerability announce CVE-2015-1793

OpenSSL: X.509 certification chain forgery

Synthesis of the vulnerability

An attacker can force OpenSSL to accept spoofed certificates, in order to listen for encrypted communications or bypass signature based authentication.
Impacted products: DCFM Enterprise, Brocade Network Advisor, Brocade vTM, ASA, Cisco Catalyst, IOS XE Cisco, Nexus by Cisco, NX-OS, Prime Infrastructure, Cisco PRSM, Cisco Router, Cisco CUCM, Clearswift Email Gateway, BIG-IP Hardware, TMOS, Fedora, FileZilla Server, FreeBSD, hMailServer, HP Switch, HP-UX, IRAD, Juniper J-Series, Junos OS, McAfee Email Gateway, McAfee NGFW, Nodejs Core, OpenSSL, Oracle Communications, Solaris, Slackware, Splunk Enterprise, stunnel, Synology DSM, Synology DS***, Synology RS***, Nessus, Websense Web Security, WinSCP, X2GoClient.
Severity: 3/4.
Consequences: client access/rights, data reading, data creation/edition.
Provenance: internet client.
Creation date: 09/07/2015.
Identifiers: 1962398, 1963151, BSA-2015-009, bulletinjul2015, c04760669, c05184351, CERTFR-2015-AVI-285, CERTFR-2015-AVI-431, cisco-sa-20150710-openssl, cpuoct2017, CVE-2015-1793, FEDORA-2015-11414, FEDORA-2015-11475, FreeBSD-SA-15:12.openssl, HPSBHF03613, HPSBUX03388, JSA10694, SB10125, SOL16937, SPL-103044, SSA:2015-190-01, SSRT102180, VIGILANCE-VUL-17337.

Description of the vulnerability

A certificate validation begins with the creation of a certificate chain, where each certificate provides the public key used to check the signature of the next certificate.

The creation of this chain may be non deterministic, especially when some identification X.509v3 extensions like "Authority Key Identifier" are not provided. When a candidate chain does not allow to validate a given certificate, OpenSSL 1.0.1 and 1.0.2 attempt to find another candidate chain. However, during these attempts, some required checks on the chain are not performed anymore. As a consequence, an attacker can make OpenSSL use its own certificate as a CA certificate, even if it includes the "basicConstraint" extension stating "CA: no". So it can create certificates for any name.

This vulnerability impacts clients checking a server certificate, and TLS servers checking a client certificate.

An attacker can therefore force OpenSSL to accept spoofed certificates, in order to listen for encrypted communications or bypass signature based authentication.
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vulnerability CVE-2015-4620

ISC Bind: denial of service via DNSCEC validation

Synthesis of the vulnerability

An attacker can force an assertion error in the DNSSEC validation of ISC Bind, in order to trigger a denial of service.
Impacted products: DCFM Enterprise, Brocade Network Advisor, Brocade vTM, Debian, BIG-IP Hardware, TMOS, Fedora, FreeBSD, HP-UX, BIND, openSUSE, RHEL, Slackware, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity: 4/4.
Consequences: denial of service on server, denial of service on service, denial of service on client.
Provenance: internet server.
Creation date: 08/07/2015.
Identifiers: BSA-2015-009, c04745746, CVE-2015-4620, DSA-3304-1, FEDORA-2015-11483, FEDORA-2015-11484, FreeBSD-SA-15:11.bind, HPSBUX03379, openSUSE-SU-2015:1250-1, openSUSE-SU-2015:1250-2, openSUSE-SU-2015:1326-1, RHSA-2015:1443-01, RHSA-2015:1471-01, SOL16912, SSA:2015-188-04, SSRT101976, SUSE-SU-2015:1205-1, USN-2669-1, VIGILANCE-VUL-17320.

Description of the vulnerability

The ISC Bind server can validate DNSSEC signed responses.

However, when a named server is configured to validate DNSSEC signatures with recursive name resolution, an assertion error occurs in the source file "name.c" for a combination of rare but likely valid record data, because developers did not expect this case. This exception stops the server process.

An attacker can therefore force an assertion error in the DNSSEC validation of ISC Bind, in order to trigger a denial of service.
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vulnerability CVE-2015-4000

TLS: weakening Diffie-Hellman via Logjam

Synthesis of the vulnerability

An attacker, located as a Man-in-the-Middle, can force the TLS client/server to accept a weak export algorithm, in order to more easily capture or alter exchanged data.
Impacted products: Apache httpd, Blue Coat CAS, ProxyAV, ProxySG par Blue Coat, SGOS by Blue Coat, DCFM Enterprise, Brocade Network Advisor, Brocade vTM, Clearswift Email Gateway, Debian, Summit, Fedora, FileZilla Server, FreeBSD, HPE BSM, HPE NNMi, HP Operations, HP-UX, AIX, DB2 UDB, IRAD, Security Directory Server, SPSS Modeler, Tivoli Storage Manager, Tivoli System Automation, Tivoli Workload Scheduler, WebSphere AS Traditional, WebSphere MQ, Juniper J-Series, Junos OS, Junos Pulse, Juniper Network Connect, Juniper SBR, lighttpd, ePO, Firefox, NSS, MySQL Community, MySQL Enterprise, Data ONTAP 7-Mode, Snap Creator Framework, SnapManager, NetBSD, nginx, Nodejs Core, OpenSSL, openSUSE, openSUSE Leap, Solaris, Palo Alto Firewall PA***, PAN-OS, Percona Server, RealPresence Collaboration Server, RealPresence Distributed Media Application, RealPresence Resource Manager, Polycom VBP, Postfix, SSL protocol, Pulse Connect Secure, Puppet, RHEL, JBoss EAP by Red Hat, Sendmail, Slackware, SUSE Linux Enterprise Desktop, SLES, Synology DS***, Synology RS***, Ubuntu, WinSCP.
Severity: 2/4.
Consequences: data reading, data creation/edition.
Provenance: internet server.
Creation date: 20/05/2015.
Revision date: 20/05/2015.
Identifiers: 1610582, 1647054, 1957980, 1958984, 1959033, 1959539, 1959745, 1960194, 1960418, 1960862, 1962398, 1962694, 1963151, 9010038, 9010039, 9010041, 9010044, BSA-2015-005, bulletinjan2016, bulletinjul2015, c04725401, c04760669, c04767175, c04770140, c04773119, c04773241, c04774058, c04778650, c04832246, c04918839, c04926789, CERTFR-2016-AVI-303, CTX216642, CVE-2015-4000, DLA-507-1, DSA-3287-1, DSA-3300-1, DSA-3688-1, FEDORA-2015-10047, FEDORA-2015-10108, FEDORA-2015-9048, FEDORA-2015-9130, FEDORA-2015-9161, FreeBSD-EN-15:08.sendmail, FreeBSD-SA-15:10.openssl, HPSBGN03399, HPSBGN03407, HPSBGN03411, HPSBGN03417, HPSBHF03433, HPSBMU03345, HPSBMU03401, HPSBUX03363, HPSBUX03388, HPSBUX03435, HPSBUX03512, JSA10681, Logjam, NetBSD-SA2015-008, NTAP-20150616-0001, NTAP-20150715-0001, NTAP-20151028-0001, openSUSE-SU-2015:1139-1, openSUSE-SU-2015:1209-1, openSUSE-SU-2015:1216-1, openSUSE-SU-2015:1277-1, openSUSE-SU-2016:0226-1, openSUSE-SU-2016:0255-1, openSUSE-SU-2016:0261-1, openSUSE-SU-2016:2267-1, PAN-SA-2016-0020, PAN-SA-2016-0028, RHSA-2015:1072-01, RHSA-2015:1185-01, RHSA-2015:1197-01, RHSA-2016:2054-01, RHSA-2016:2055-01, RHSA-2016:2056-01, SA111, SA40002, SA98, SB10122, SSA:2015-219-02, SSRT102180, SSRT102254, SSRT102964, SSRT102977, SUSE-SU-2015:1143-1, SUSE-SU-2015:1150-1, SUSE-SU-2015:1177-1, SUSE-SU-2015:1177-2, SUSE-SU-2015:1181-1, SUSE-SU-2015:1181-2, SUSE-SU-2015:1182-2, SUSE-SU-2015:1183-1, SUSE-SU-2015:1183-2, SUSE-SU-2015:1184-1, SUSE-SU-2015:1184-2, SUSE-SU-2015:1185-1, SUSE-SU-2015:1268-1, SUSE-SU-2015:1268-2, SUSE-SU-2015:1269-1, SUSE-SU-2015:1581-1, SUSE-SU-2016:0224-1, SUSE-SU-2018:1768-1, TSB16728, USN-2624-1, USN-2625-1, USN-2656-1, USN-2656-2, VIGILANCE-VUL-16950, VN-2015-007.

Description of the vulnerability

The Diffie-Hellman algorithm is used to exchange cryptographic keys. The DHE_EXPORT suite uses prime numbers smaller than 512 bits.

The Diffie-Hellman algorithm is used by TLS. However, during the negotiation, an attacker, located as a Man-in-the-Middle, can force TLS to use DHE_EXPORT (event if stronger suites are available).

This vulnerability can then be combined with VIGILANCE-VUL-16951.

An attacker, located as a Man-in-the-Middle, can therefore force the TLS client/server to accept a weak export algorithm, in order to more easily capture or alter exchanged data.
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computer vulnerability announce CVE-2015-0204 CVE-2015-0458 CVE-2015-0459

Oracle Java: several vulnerabilities of April 2015

Synthesis of the vulnerability

Several vulnerabilities of Oracle Java were announced in April 2015.
Impacted products: DCFM Enterprise, Brocade Network Advisor, Brocade vTM, Debian, Avamar, ECC, Fedora, AIX, DB2 UDB, Domino, Notes, IRAD, Security Directory Server, SPSS Modeler, Tivoli Storage Manager, Tivoli System Automation, Tivoli Workload Scheduler, WebSphere AS Traditional, WebSphere MQ, ePO, Java OpenJDK, openSUSE, Java Oracle, JavaFX, Puppet, RHEL, SUSE Linux Enterprise Desktop, SLES, Ubuntu.
Severity: 3/4.
Consequences: user access/rights, data reading, data creation/edition, data deletion, denial of service on service, denial of service on client.
Provenance: document.
Number of vulnerabilities in this bulletin: 14.
Creation date: 15/04/2015.
Identifiers: 1610582, 1902260, 1903541, 1903704, 1958902, 1960194, 1964236, 1966551, 1967498, 1968485, 205086, 206954, 7045736, BSA-2015-009, CERTFR-2015-AVI-172, cpuapr2015, CVE-2015-0204, CVE-2015-0458, CVE-2015-0459, CVE-2015-0460, CVE-2015-0469, CVE-2015-0470, CVE-2015-0477, CVE-2015-0478, CVE-2015-0480, CVE-2015-0484, CVE-2015-0486, CVE-2015-0488, CVE-2015-0491, CVE-2015-0492, DSA-3234-1, DSA-3235-1, DSA-3316-1, ESA-2015-085, ESA-2015-134, FEDORA-2015-6357, FEDORA-2015-6369, FEDORA-2015-6397, FREAK, MDVSA-2015:212, openSUSE-SU-2015:0773-1, openSUSE-SU-2015:0774-1, RHSA-2015:0806-01, RHSA-2015:0807-01, RHSA-2015:0808-01, RHSA-2015:0809-01, RHSA-2015:0854-01, RHSA-2015:0857-01, RHSA-2015:0858-01, RHSA-2015:1006-01, RHSA-2015:1007-01, RHSA-2015:1020-01, RHSA-2015:1021-01, RHSA-2015:1091-01, SB10119, SUSE-SU-2015:0833-1, SUSE-SU-2015:1085-1, SUSE-SU-2015:1086-1, SUSE-SU-2015:1086-2, SUSE-SU-2015:1086-3, SUSE-SU-2015:1086-4, SUSE-SU-2015:1138-1, SUSE-SU-2015:1161-1, SUSE-SU-2015:2166-1, SUSE-SU-2015:2168-1, SUSE-SU-2015:2168-2, SUSE-SU-2015:2182-1, SUSE-SU-2015:2192-1, SUSE-SU-2015:2216-1, USN-2573-1, USN-2574-1, VIGILANCE-VUL-16607, VU#243585.

Description of the vulnerability

Several vulnerabilities were announced in Oracle Java.

An attacker can use a vulnerability of 2D, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-0469]

An attacker can use a vulnerability of 2D, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-0459]

An attacker can use a vulnerability of 2D, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-0491]

An attacker can use a vulnerability of Hotspot, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-0460]

An attacker can use a vulnerability of JavaFX, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-0492]

An attacker can use a vulnerability of JavaFX, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-0458]

An attacker can use a vulnerability of JavaFX, in order to obtain information, to alter information, or to trigger a denial of service. [severity:3/4; CVE-2015-0484]

An attacker can use a vulnerability of Tools, in order to alter information, or to trigger a denial of service. [severity:2/4; CVE-2015-0480]

An attacker can use a vulnerability of Deployment, in order to obtain information. [severity:2/4; CVE-2015-0486]

An attacker can use a vulnerability of JSSE, in order to trigger a denial of service. [severity:2/4; CVE-2015-0488]

An attacker can use a vulnerability of Beans, in order to alter information. [severity:2/4; CVE-2015-0477]

An attacker can use a vulnerability of Hotspot, in order to alter information. [severity:2/4; CVE-2015-0470]

An attacker can use a vulnerability of JCE, in order to obtain information (VIGILANCE-VUL-17836). [severity:2/4; CVE-2015-0478]

An attacker, located as a Man-in-the-Middle, can force the Chrome, JSSE, LibReSSL, Mono or OpenSSL client to accept a weak export algorithm, in order to more easily capture or alter exchanged data (VIGILANCE-VUL-16301). [severity:2/4; CVE-2015-0204, FREAK, VU#243585]
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computer vulnerability alert CVE-2015-2808

TLS: RC4 decryption via Bar Mitzvah

Synthesis of the vulnerability

An attacker can use the Bar Mitzvah Attack on TLS, in order to obtain sensitive information encrypted by RC4.
Impacted products: DCFM Enterprise, Brocade Network Advisor, Brocade vTM, Avamar, Black Diamond, ExtremeXOS, Summit, BIG-IP Hardware, TMOS, HPE BSM, HP Data Protector, HPE NNMi, HP Operations, SiteScope, HP Switch, HP-UX, AIX, DB2 UDB, Domino, Notes, IRAD, Security Directory Server, Tivoli Storage Manager, Tivoli Workload Scheduler, WebSphere AS Traditional, WebSphere MQ, SnapManager, Oracle Communications, Oracle Directory Server, Oracle Directory Services Plus, Oracle Fusion Middleware, Oracle GlassFish Server, Oracle Identity Management, Oracle iPlanet Web Server, Oracle OIT, Oracle Virtual Directory, WebLogic, Oracle Web Tier, SSL protocol, RHEL, SUSE Linux Enterprise Desktop, SLES.
Severity: 2/4.
Consequences: data reading.
Provenance: internet client.
Creation date: 27/03/2015.
Identifiers: 1450666, 1610582, 1647054, 1882708, 1883551, 1883553, 1902260, 1903541, 1960659, 1963275, 1967498, 523628, 7014463, 7022958, 7045736, 9010041, 9010044, Bar Mitzvah, BSA-2015-007, c04708650, c04767175, c04770140, c04772305, c04773119, c04773241, c04777195, c04777255, c04832246, c04926789, c05085988, c05336888, cpujan2018, cpuoct2017, CVE-2015-2808, DSA-2018-124, HPSBGN03350, HPSBGN03393, HPSBGN03399, HPSBGN03407, HPSBGN03414, HPSBGN03415, HPSBGN03580, HPSBHF03673, HPSBMU03345, HPSBMU03401, HPSBUX03435, HPSBUX03512, NTAP-20150715-0001, NTAP-20151028-0001, RHSA-2015:1020-01, RHSA-2015:1021-01, RHSA-2015:1091-01, SOL16864, SSRT102254, SSRT102977, SUSE-SU-2015:1073-1, SUSE-SU-2015:1085-1, SUSE-SU-2015:1086-1, SUSE-SU-2015:1086-2, SUSE-SU-2015:1086-3, SUSE-SU-2015:1086-4, SUSE-SU-2015:1138-1, SUSE-SU-2015:1161-1, VIGILANCE-VUL-16486, VN-2015-004.

Description of the vulnerability

During the initialization of a TLS session, the client and the server negotiate cryptographic algorithms. The RC4 algorithm can be chosen to encrypt data.

For some weak keys (one over 2^24), the Invariance Weakness can be used to predict the two LSB (Least Significant Bit) of the 100 first bytes encrypted with RC4. The first TLS message is "Finished" (36 bytes), thus an attacker can predict LSBs of 64 bytes.

An attacker can therefore use the Bar Mitzvah Attack on TLS, in order to obtain sensitive information encrypted by RC4.
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vulnerability CVE-2013-2566

SSL/TLS: obtaining messages encrypted by RC4

Synthesis of the vulnerability

When an attacker has 2^30 RC4 encrypted messages with different keys, he can guess the clear text message.
Impacted products: DCFM Enterprise, Brocade Network Advisor, Brocade vTM, Avamar, BIG-IP Hardware, TMOS, HP Switch, Opera, Oracle Communications, Oracle Directory Server, Oracle Directory Services Plus, Oracle Fusion Middleware, Oracle GlassFish Server, Oracle Identity Management, Oracle iPlanet Web Server, Oracle OIT, Oracle Virtual Directory, WebLogic, Oracle Web Tier, SSL protocol.
Severity: 1/4.
Consequences: data reading.
Provenance: internet client.
Creation date: 15/03/2013.
Identifiers: 523628, BID-58796, BSA-2015-007, c05336888, cpuapr2017, cpujan2018, cpuoct2016, cpuoct2017, CVE-2013-2566, DSA-2018-124, HPSBHF03673, SOL14638, VIGILANCE-VUL-12530.

Description of the vulnerability

A SSL/TLS session can negotiate different encryption algorithms.

The RC4 algorithm uses a continuous stream of bytes generated from the key. This stream if then combined (XOR) with the clear text message.

However, the generated stream is biased. A statistical analysis of million of encrypted messages shows this bias.

When an attacker has 2^30 (minimum 2^24) RC4 encrypted messages with different keys, he can therefore guess the clear text message. This vulnerability is hard to exploit because of the quantity of messages required to perform the attack.
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