Vulnerability identifier: #VU32590

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-6450

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 manipulate or delete data.

The DTLS retransmission implementation in OpenSSL 1.0.0 before 1.0.0l and 1.0.1 before 1.0.1f does not properly maintain data structures for digest and encryption contexts, which might allow man-in-the-middle attackers to trigger the use of a different context and cause a denial of service (application crash) by interfering with packet delivery, related to ssl/d1_both.c and ssl/t1_enc.c.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.0 - 1.0.0k

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External links
http://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=34628967f1e65dc8f34e000f0f5518e21afbfc7b
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/msg00031.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00032.html
http://rhn.redhat.com/errata/RHSA-2014-0015.html
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.openssl.org/news/vulnerabilities.html
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/64618
http://www.securitytracker.com/id/1029549
http://www.securitytracker.com/id/1031594
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://puppet.com/security/cve/cve-2013-6450
http://security-tracker.debian.org/tracker/CVE-2013-6450

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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.