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Computer vulnerabilities of Clearswift Email Gateway

threat bulletin CVE-2014-9293 CVE-2014-9294 CVE-2014-9295

NTP.org: multiple vulnerabilities

Synthesis of the vulnerability

An attacker can use several vulnerabilities of NTP.org.
Severity: 3/4.
Number of vulnerabilities in this bulletin: 6.
Creation date: 19/12/2014.
Revision date: 17/02/2016.
Identifiers: c04554677, c04574882, c04916783, CERTFR-2014-AVI-537, CERTFR-2014-AVI-538, CERTFR-2016-AVI-148, cisco-sa-20141222-ntpd, cpuoct2016, CVE-2014-9293, CVE-2014-9294, CVE-2014-9295, CVE-2014-9296, DSA-3108-1, FEDORA-2014-17361, FEDORA-2014-17367, FEDORA-2014-17395, FreeBSD-SA-14:31.ntp, HPSBHF03432, HPSBPV03266, HPSBUX03240, JSA10663, MBGSA-1405, MDVSA-2015:003, MDVSA-2015:140, NetBSD-SA2015-003, openSUSE-SU-2014:1670-1, openSUSE-SU-2014:1680-1, RHSA-2014:2024-01, RHSA-2014:2025-01, RHSA-2015:0104-01, sk103825, SOL15933, SOL15934, SOL15935, SOL15936, SSA:2014-356-01, SSA-671683, SSRT101872, SUSE-SU-2014:1686-1, SUSE-SU-2014:1686-2, SUSE-SU-2014:1686-3, SUSE-SU-2014:1690-1, SUSE-SU-2015:0259-1, SUSE-SU-2015:0259-2, SUSE-SU-2015:0259-3, SUSE-SU-2015:0274-1, SUSE-SU-2015:0322-1, USN-2449-1, VIGILANCE-VUL-15867, VN-2014-005, VU#852879.
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Description of the vulnerability

Several vulnerabilities were announced in NTP.org.

An attacker can predict the default key generated by config_auth(), in order to bypass the authentication. [severity:2/4; CVE-2014-9293]

An attacker can predict the key generated by ntp-keygen, in order to decrypt sessions. [severity:2/4; CVE-2014-9294]

An attacker can generate a buffer overflow in crypto_recv(), in order to trigger a denial of service, and possibly to execute code. [severity:3/4; CVE-2014-9295]

An attacker can generate a buffer overflow in ctl_putdata(), in order to trigger a denial of service, and possibly to execute code. [severity:3/4; CVE-2014-9295]

An attacker can generate a buffer overflow in configure(), in order to trigger a denial of service, and possibly to execute code. [severity:3/4; CVE-2014-9295]

An attacker can trigger an error in receive(), which is not detected. [severity:1/4; CVE-2014-9296]
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vulnerability announce CVE-2015-5288 CVE-2015-5289

PostgreSQL: two vulnerabilities

Synthesis of the vulnerability

An attacker can use several vulnerabilities of PostgreSQL.
Severity: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 08/10/2015.
Identifiers: CERTFR-2015-AVI-433, CVE-2015-5288, CVE-2015-5289, DSA-2019-131, DSA-3374-1, DSA-3475-1, FEDORA-2015-6d2a957a87, openSUSE-SU-2015:1907-1, openSUSE-SU-2015:1919-1, RHSA-2015:2077-01, RHSA-2015:2078-01, RHSA-2015:2081-01, RHSA-2015:2083-01, SUSE-SU-2016:0677-1, USN-2772-1, VIGILANCE-VUL-18062.
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Description of the vulnerability

Several vulnerabilities were announced in PostgreSQL.

An attacker can trigger a fatal error when json/jsonb data are analyzed, in order to trigger a denial of service. [severity:2/4; CVE-2015-5289]

An attacker can read a memory fragment via the crypt() function, in order to obtain sensitive information. [severity:1/4; CVE-2015-5288]
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computer threat announce CVE-2015-5477

BIND: denial of service via TKEY

Synthesis of the vulnerability

An attacker can force an assertion error with a TKEY query sent to BIND, in order to trigger a denial of service.
Severity: 3/4.
Creation date: 29/07/2015.
Revisions dates: 29/07/2015, 03/08/2015.
Identifiers: AA-01272, bulletinjul2015, c04769567, c04800156, c04891218, CERTFR-2015-AVI-322, CERTFR-2016-AVI-020, CVE-2015-5477, DSA-3319-1, FEDORA-2015-12316, FEDORA-2015-12335, FEDORA-2015-12357, FreeBSD-SA-15:17.bind, HPSBUX03400, HPSBUX03511, HPSBUX03522, JSA10718, openSUSE-SU-2015:1326-1, openSUSE-SU-2015:1335-1, RHSA-2015:1513-01, RHSA-2015:1514-01, RHSA-2015:1515-01, RHSA-2016:0078-01, RHSA-2016:0079-01, SOL16909, SSA:2015-209-01, SSRT102211, SSRT102248, SSRT102942, SUSE-SU-2015:1304-1, SUSE-SU-2015:1305-1, SUSE-SU-2015:1316-1, SUSE-SU-2015:1322-1, SUSE-SU-2016:0227-1, USN-2693-1, VIGILANCE-VUL-17520.
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Description of the vulnerability

The TKEY (Transaction KEY) record is used to transmit information about shared keys (RFC 2930).

The TKEY record is usually located in the DNS Additional section, and BIND searches it with the dns_message_findname() function. If BIND does not find it, it searches in the DNS Answer section.

However, BIND does not reset the variable storing the name before the second call to dns_message_findname(). When BIND receives a malformed TKEY message, a REQUIRE() assertion error thus occurs in message.c because developers did not expect this case, which stops the process.

An attacker can therefore force an assertion error with a TKEY query sent to BIND, in order to trigger a denial of service.
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threat alert 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.
Severity: 3/4.
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.
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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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threat 17148

Clearswift SECURE Email Gateway: no archive filtering

Synthesis of the vulnerability

An attacker can send archives in non standard format or ill formed ones to Clearswift SECURE Email Gateway, in order to bypass the anti-virus scan.
Severity: 2/4.
Creation date: 16/06/2015.
Identifiers: VIGILANCE-VUL-17148.
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Description of the vulnerability

The Clearswift SECURE Email Gateway product includes an anti-virus from Kaspersky.

SECURE Email Gateway does not let the anti-virus scan archives because it unpacks them itself. However, archive format recognized by the anti-virus tool and SECURE Email Gateway does not necessarily match. So it happens that archives are scanned neither by SECURE Email Gateway nor by the anti-virus tool.

An attacker can therefore send archives in non standard format or ill formed ones to Clearswift SECURE Email Gateway, in order to bypass the anti-virus scan.
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security note 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.
Severity: 2/4.
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.
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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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security alert CVE-2015-0138 CVE-2015-0204

OpenSSL, LibReSSL, Mono, JSSE: weakening TLS encryption via FREAK

Synthesis of the vulnerability

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.
Severity: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 04/03/2015.
Revision date: 09/03/2015.
Identifiers: 122007, 1450666, 1610582, 1647054, 1698613, 1699051, 1699810, 1700225, 1700997, 1701485, 1902260, 1903541, 1963275, 1968485, 1973383, 55767, 7014463, 7022958, 9010028, ARUBA-PSA-2015-003, bulletinjan2015, c04556853, c04679334, c04773241, CERTFR-2015-AVI-108, CERTFR-2015-AVI-117, CERTFR-2015-AVI-146, CERTFR-2016-AVI-303, cisco-sa-20150310-ssl, cpuapr2017, cpujul2018, cpuoct2017, CTX216642, CVE-2015-0138, CVE-2015-0204, DSA-3125-1, FEDORA-2015-0512, FEDORA-2015-0601, FG-IR-15-007, FREAK, FreeBSD-SA-15:01.openssl, HPSBMU03345, HPSBUX03244, HPSBUX03334, JSA10679, MDVSA-2015:019, MDVSA-2015:062, MDVSA-2015:063, NetBSD-SA2015-006, NetBSD-SA2015-007, NTAP-20150205-0001, openSUSE-SU-2015:0130-1, openSUSE-SU-2016:0640-1, RHSA-2015:0066-01, RHSA-2015:0800-01, RHSA-2015:1020-01, RHSA-2015:1021-01, RHSA-2015:1091-01, SA40015, SA88, SA91, SB10108, SB10110, SOL16120, SOL16123, SOL16124, SOL16126, SOL16135, SOL16136, SOL16139, SP-CAAANXD, SPL-95203, SPL-95206, SSA:2015-009-01, SSRT101885, SSRT102000, 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, T1022075, USN-2459-1, VIGILANCE-VUL-16301, VN-2015-003_FREAK, VU#243585.
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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.

Several cryptographic algorithms can be negotiated, such as algorithms allowed for USA export (less than 512 bits).

An attacker, located as a Man-in-the-Middle, can inject during the session initialization a message choosing an export algorithm. This message should generate an error, however some TLS clients accept it.

Note: the variant related to Windows is described in VIGILANCE-VUL-16332.

An attacker, located as a Man-in-the-Middle, can therefore 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.
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vulnerability note 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.
Severity: 2/4.
Number of vulnerabilities in this bulletin: 2.
Creation date: 04/03/2015.
Revision date: 09/03/2015.
Identifiers: 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.
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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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weakness announce CVE-2015-0235

glibc: buffer overflow of gethostbyname, GHOST

Synthesis of the vulnerability

An attacker can for example send an email using a long IPv4 address, to force the messaging server to resolve this address, and to generate a buffer overflow in gethostbyname() of the glibc, in order to trigger a denial of service, and possibly to execute code. Several programs using the gethostbyname() function are vulnerable with a similar attack vector.
Severity: 4/4.
Creation date: 27/01/2015.
Revision date: 27/01/2015.
Identifiers: 198850, 199399, c04577814, c04589512, CERTFR-2015-AVI-043, cisco-sa-20150128-ghost, cpujul2015, cpujul2017, cpuoct2016, cpuoct2017, cpuoct2018, CTX200437, CVE-2015-0235, DSA-3142-1, ESA-2015-030, ESA-2015-041, GHOST, HPSBGN03270, HPSBGN03285, JSA10671, K16057, KM01391662, MDVSA-2015:039, openSUSE-SU-2015:0162-1, openSUSE-SU-2015:0184-1, PAN-SA-2015-0002, RHSA-2015:0090-01, RHSA-2015:0092-01, RHSA-2015:0099-01, RHSA-2015:0101-01, RHSA-2015:0126-01, SB10100, sk104443, SOL16057, SSA:2015-028-01, SSA-994726, SUSE-SU-2015:0158-1, USN-2485-1, VIGILANCE-VUL-16060, VU#967332.
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Description of the vulnerability

The glibc library provides two functions to obtain the IP address of a server from its DNS name:
  struct hostent *gethostbyname(const char *name);
  struct hostent *gethostbyname2(const char *name, int af);

For example:
  he = gethostbyname("www.example.com");

These functions also accept to directly process an IP address:
  he = gethostbyname("192.168.1.1");

However, a malformed IPv4 address, which is too long such as 192.168.111111.1 (more than 1024 byte long) triggers an overflow in the __nss_hostname_digits_dots() function.

An attacker can therefore for example send an email using a long IPv4 address, to force the messaging server to resolve this address, and to generate a buffer overflow in gethostbyname() of the glibc, in order to trigger a denial of service, and possibly to execute code.

Several programs using the gethostbyname() function are vulnerable (exim, php, pppd, procmail) with a similar attack vector. The following programs are apparently not vulnerable: apache, cups, dovecot, gnupg, isc-dhcp, lighttpd, mariadb/mysql, nfs-utils, nginx, nodejs, openldap, openssh, postfix, proftpd, pure-ftpd, rsyslog, samba, sendmail, squid, sysklogd, syslog-ng, tcp_wrappers, vsftpd, xinetd.
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computer weakness alert CVE-2014-3570 CVE-2014-3571 CVE-2014-3572

OpenSSL: multiple vulnerabilities

Synthesis of the vulnerability

An attacker can use several vulnerabilities of OpenSSL.
Severity: 2/4.
Number of vulnerabilities in this bulletin: 7.
Creation date: 08/01/2015.
Identifiers: 1610582, 1699810, 1700997, 1902260, 1903541, 1973383, 55767, 9010028, ARUBA-PSA-2015-003, bulletinjan2015, c04556853, c04679334, CERTFR-2015-AVI-008, CERTFR-2015-AVI-108, CERTFR-2015-AVI-146, CERTFR-2016-AVI-303, cisco-sa-20150310-ssl, cpuapr2017, cpujul2018, cpuoct2016, cpuoct2017, CTX216642, CVE-2014-3570, CVE-2014-3571, CVE-2014-3572, CVE-2014-8275, CVE-2015-0204, CVE-2015-0205, CVE-2015-0206, DSA-3125-1, FEDORA-2015-0512, FEDORA-2015-0601, FreeBSD-SA-15:01.openssl, HPSBUX03244, HPSBUX03334, JSA10679, MDVSA-2015:019, MDVSA-2015:062, MDVSA-2015:063, NetBSD-SA2015-006, NetBSD-SA2015-007, NTAP-20150205-0001, openSUSE-SU-2015:0130-1, openSUSE-SU-2015:1277-1, openSUSE-SU-2016:0640-1, RHSA-2015:0066-01, RHSA-2015:0800-01, SA40015, SA88, SB10108, SOL16120, SOL16123, SOL16124, SOL16126, SOL16135, SOL16136, SOL16139, SP-CAAANXD, SPL-95203, SPL-95206, SSA:2015-009-01, SSRT101885, SSRT102000, SUSE-SU-2015:1138-1, SUSE-SU-2015:1161-1, USN-2459-1, VIGILANCE-VUL-15934, VU#243585.
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Description of the vulnerability

Several vulnerabilities were announced in OpenSSL.

An attacker can send a DTLS message, to force a NULL pointer to be dereferenced in dtls1_get_record(), in order to trigger a denial of service. [severity:2/4; CVE-2014-3571]

An attacker can send a DTLS message, to create a memory leak in dtls1_buffer_record(), in order to trigger a denial of service. [severity:1/4; CVE-2015-0206]

An attacker can force a TLS client to use ECDH instead of ECDHE (ephemeral). [severity:2/4; CVE-2014-3572]

An attacker can force a TLS client to use EXPORT_RSA instead of RSA (VIGILANCE-VUL-16301). [severity:2/4; CVE-2015-0204, VU#243585]

An attacker can authenticate without using a private key, in the case where the server trusts a certification authority publishing certificates with DH keys (rare case) (VIGILANCE-VUL-16300). [severity:2/4; CVE-2015-0205]

An attacker can change the fingerprint of a certificate, with no known consequence on security. [severity:1/4; CVE-2014-8275]

In some rare cases, the BN_sqr() function produces an invalid result, with no known consequence on security. [severity:1/4; CVE-2014-3570]
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