Vulnerability identifier: #VU32589

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-6449

CWE-ID: CWE-310

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The ssl_get_algorithm2 function in ssl/s3_lib.c in OpenSSL before 1.0.2 obtains a certain version number from an incorrect data structure, which allows remote attackers to cause a denial of service (daemon crash) via crafted traffic from a TLS 1.2 client.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.0 - 1.0.0t, 1.0.1 - 1.0.1u

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External links
http://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=ca989269a2876bae79393bd54c3e72d49975fc75
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124833.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124854.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-December/124858.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136470.html
http://lists.fedoraproject.org/pipermail/package-announce/2014-August/136473.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00006.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00009.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00012.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00031.html
http://rhn.redhat.com/errata/RHSA-2014-0015.html
http://rhn.redhat.com/errata/RHSA-2014-0041.html
http://rt.openssl.org/Ticket/Display.html?id=3200&user=guest&pass=guest
http://seclists.org/fulldisclosure/2014/Dec/23
http://security.gentoo.org/glsa/glsa-201412-39.xml
http://www.debian.org/security/2014/dsa-2833
http://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
http://www.oracle.com/technetwork/topics/security/cpujul2014-1972956.html
http://www.securityfocus.com/archive/1/534161/100/0/threaded
http://www.securityfocus.com/bid/64530
http://www.securitytracker.com/id/1029548
http://www.ubuntu.com/usn/USN-2079-1
http://www.vmware.com/security/advisories/VMSA-2014-0012.html
http://www-01.ibm.com/support/docview.wss?uid=isg400001841
http://www-01.ibm.com/support/docview.wss?uid=isg400001843
http://bugzilla.redhat.com/show_bug.cgi?id=1045363
http://issues.apache.org/jira/browse/TS-2355

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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.