Vulnerability identifier: #VU33638

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-7575

CWE-ID: CWE-19

Exploitation vector: Network

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

Mozilla Network Security Services (NSS) before 3.20.2, as used in Mozilla Firefox before 43.0.2 and Firefox ESR 38.x before 38.5.2, does not reject MD5 signatures in Server Key Exchange messages in TLS 1.2 Handshake Protocol traffic, which makes it easier for man-in-the-middle attackers to spoof servers by triggering a collision.

Mitigation
Install update from vendor's website.

External links
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00038.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00041.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00043.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00044.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00045.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00047.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00048.html
http://lists.opensuse.org/opensuse-updates/2015-12/msg00139.html
http://lists.opensuse.org/opensuse-updates/2016-01/msg00005.html
http://lists.opensuse.org/opensuse-updates/2016-01/msg00058.html
http://lists.opensuse.org/opensuse-updates/2016-01/msg00059.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00007.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00101.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00166.html
http://rhn.redhat.com/errata/RHSA-2016-0049.html
http://rhn.redhat.com/errata/RHSA-2016-0050.html
http://rhn.redhat.com/errata/RHSA-2016-0053.html
http://rhn.redhat.com/errata/RHSA-2016-0054.html
http://rhn.redhat.com/errata/RHSA-2016-0055.html
http://rhn.redhat.com/errata/RHSA-2016-0056.html
http://www.debian.org/security/2016/dsa-3436
http://www.debian.org/security/2016/dsa-3437
http://www.debian.org/security/2016/dsa-3457
http://www.debian.org/security/2016/dsa-3458
http://www.debian.org/security/2016/dsa-3465
http://www.debian.org/security/2016/dsa-3491
http://www.debian.org/security/2016/dsa-3688
http://www.mozilla.org/security/announce/2015/mfsa2015-150.html
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
http://www.securityfocus.com/bid/79684
http://www.securityfocus.com/bid/91787
http://www.securitytracker.com/id/1034541
http://www.securitytracker.com/id/1036467
http://www.ubuntu.com/usn/USN-2863-1
http://www.ubuntu.com/usn/USN-2864-1
http://www.ubuntu.com/usn/USN-2865-1
http://www.ubuntu.com/usn/USN-2866-1
http://www.ubuntu.com/usn/USN-2884-1
http://www.ubuntu.com/usn/USN-2904-1
http://access.redhat.com/errata/RHSA-2016:1430
http://bugzilla.mozilla.org/show_bug.cgi?id=1158489
http://developer.mozilla.org/docs/Mozilla/Projects/NSS/NSS_3.20.2_release_notes
http://security.gentoo.org/glsa/201701-46
http://security.gentoo.org/glsa/201706-18
http://security.gentoo.org/glsa/201801-15
http://security.netapp.com/advisory/ntap-20160225-0001/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.