Vulnerability identifier: #VU82376

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-0799

CWE-ID: CWE-119

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 execute arbitrary code on the target system.

The vulnerability exists due to fmtstr function in crypto/bio/b_print.c in OpenSSL improperly calculates string lengths. A remote attacker can cause a denial of service (overflow and out-of-bounds read) or possibly have unspecified other impact via a long string.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

OpenSSL: 1.0.0 - 1.0.0t, 1.0.1 - 1.0.1r

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External links
http://git.openssl.org/?p=openssl.git;a=commit;h=578b956fe741bf8e84055547b1e83c28dd902c73
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://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05068681
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05111017
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05131085
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150800
http://rhn.redhat.com/errata/RHSA-2016-0722.html
http://rhn.redhat.com/errata/RHSA-2016-0996.html
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
http://www.securityfocus.com/bid/91787
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150888
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05086877
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05141441
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05150736
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05135617
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05158380
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05126404
http://marc.info/?l=bugtraq&m=146108058503441&w=2
http://marc.info/?l=bugtraq&m=145983526810210&w=2
http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
http://www.securityfocus.com/bid/83755
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00015.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00017.html
http://www.openssl.org/news/secadv/20160301.txt
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00007.html
http://www.debian.org/security/2016/dsa-3500
http://security.gentoo.org/glsa/201603-15
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00025.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00002.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00006.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178358.html
http://www.ubuntu.com/usn/USN-2914-1
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00010.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://lists.opensuse.org/opensuse-security-announce/2016-03/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00004.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00038.html
http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00012.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/178817.html
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05376917
http://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722
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://rhn.redhat.com/errata/RHSA-2016-2957.html
http://rhn.redhat.com/errata/RHSA-2016-2073.html
http://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

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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.