Vulnerability identifier: #VU41415

Vulnerability risk: Medium

CVSSv3.1: 4.6 [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-2014-5139

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

The vulnerability allows remote SSL servers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (NULL pointer dereference and client application crash) via a ServerHello message that includes an SRP ciphersuite without the required negotiation of that ciphersuite with the client.

Mitigation
Install update from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.1 - 1.0.1h

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External links
http:httpftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2014-008.txt.asc
http://aix.software.ibm.com/aix/efixes/security/openssl_advisory10.asc
http://lists.opensuse.org/opensuse-updates/2014-08/msg00036.html
http://marc.info/?l=bugtraq&m=142350350616251&w=2
http://marc.info/?l=bugtraq&m=142495837901899&w=2
http://marc.info/?l=bugtraq&m=142624590206005&w=2
http://marc.info/?l=bugtraq&m=142624619906067
http://marc.info/?l=bugtraq&m=142624619906067&w=2
http://marc.info/?l=bugtraq&m=142624679706236&w=2
http://marc.info/?l=bugtraq&m=142624719706349&w=2
http://marc.info/?l=bugtraq&m=142660345230545&w=2
http://marc.info/?l=bugtraq&m=142791032306609&w=2
http://marc.info/?l=bugtraq&m=143290437727362&w=2
http://marc.info/?l=bugtraq&m=143290522027658&w=2
http://secunia.com/advisories/59700
http://secunia.com/advisories/59710
http://secunia.com/advisories/59756
http://secunia.com/advisories/60022
http://secunia.com/advisories/60221
http://secunia.com/advisories/60493
http://secunia.com/advisories/60803
http://secunia.com/advisories/60810
http://secunia.com/advisories/60917
http://secunia.com/advisories/60921
http://secunia.com/advisories/61017
http://secunia.com/advisories/61100
http://secunia.com/advisories/61171
http://secunia.com/advisories/61184
http://secunia.com/advisories/61392
http://secunia.com/advisories/61775
http://secunia.com/advisories/61959
http://security.gentoo.org/glsa/glsa-201412-39.xml
http://support.f5.com/kb/en-us/solutions/public/15000/500/sol15567.html
http://www.debian.org/security/2014/dsa-2998
http://www.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-372998.htm
http://www.securityfocus.com/bid/69077
http://www.securitytracker.com/id/1030693
http://www.tenable.com/security/tns-2014-06
http://www-01.ibm.com/support/docview.wss?uid=nas8N1020240
http://www-01.ibm.com/support/docview.wss?uid=swg21682293
http://www-01.ibm.com/support/docview.wss?uid=swg21683389
http://www-01.ibm.com/support/docview.wss?uid=swg21686997
http://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=80bd7b41b30af6ee96f519e629463583318de3b0
http://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=83764a989dcc87fbea337da5f8f86806fe767b7e
http://lists.balabit.hu/pipermail/syslog-ng-announce/2014-September/000196.html
http://www.freebsd.org/security/advisories/FreeBSD-SA-14:18.openssl.asc
http://www.openssl.org/news/secadv_20140806.txt

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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.