Vulnerability identifier: #VU82375

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-0798

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description

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

The vulnerability exists due to memory leak within the SRP_VBASE_get_by_user implementation in OpenSSL. A remote attacker can perform a denial of service attack (memory consumption) by providing an invalid username in a connection attempt, related to apps/s_server.c and crypto/srp/srp_vfy.c

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

OpenSSL: 1.0.0 - 1.0.0t, 1.0.1 - 1.0.1r

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External links
http://openssl.org/news/secadv/20160301.txt
http://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40168
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
http://www.securityfocus.com/bid/91787
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.securityfocus.com/bid/83705
http://www.openssl.org/news/secadv/20160301.txt
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00006.html
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160302-openssl
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00001.html
http://www.ubuntu.com/usn/USN-2914-1
http://www.debian.org/security/2016/dsa-3500
http://security.gentoo.org/glsa/201603-15
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
http://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03741en_us
http://www.securitytracker.com/id/1035133
http://security.FreeBSD.org/advisories/FreeBSD-SA-16:12.openssl.asc
http://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
http://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=259b664f950c2ba66fbf4b0fe5281327904ead21

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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.