#VU32589 Cryptographic issues in OpenSSL - CVE-2013-6449

Vulnerability identifier: #VU32589

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

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: 1.0.0o - 1.0.0p, 1.0.1t - 1.0.1p

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