Explain CVE-2015-1793
The X509_verify_cert function in crypto/x509/x509_vfy.c in OpenSSL 1.0.1n, 1.0.1o, 1.0.2b, and 1.0.2c does not properly process X.509 Basic Constraints cA values during identification of alternative certificate chains, which allows remote attackers to spoof a Certification Authority role and trigger unintended certificate verifications via a valid leaf certificate.
Affected Products: n/a
References: [{'name': 'SSRT102180', 'tags': ['vendor-advisory', 'x_refsource_HP'], 'url': 'http://marc.info/?l=bugtraq&m=143880121627664&w=2'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04822825'}, {'name': '1032817', 'tags': ['vdb-entry', 'x_refsource_SECTRACK'], 'url': 'http://www.securitytracker.com/id/1032817'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html'}, {'name': 'GLSA-201507-15', 'tags': ['vendor-advisory', 'x_refsource_GENTOO'], 'url': 'https://security.gentoo.org/glsa/201507-15'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-454058.htm'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html'}, {'name': '20150710 OpenSSL Alternative Chains Certificate Forgery Vulnerability (July 2015) Affecting Cisco Products', 'tags': ['vendor-advisory', 'x_refsource_CISCO'], 'url': 'http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150710-openssl'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=9a0db453ba017ebcaccbee933ee6511a9ae4d1c8'}, {'name': 'FreeBSD-SA-15:12', 'tags': ['vendor-advisory', 'x_refsource_FREEBSD'], 'url': 'https://www.freebsd.org/security/advisories/FreeBSD-SA-15:12.openssl.asc'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351'}, {'name': 'FEDORA-2015-11414', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161747.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://openssl.org/news/secadv_20150709.txt'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes'}, {'name': 'HPSBGN03424', 'tags': ['vendor-advisory', 'x_refsource_HP'], 'url': 'http://marc.info/?l=bugtraq&m=144370846326989&w=2'}, {'name': 'FEDORA-2015-11475', 'tags': ['vendor-advisory', 'x_refsource_FEDORA'], 'url': 'http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161782.html'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://kc.mcafee.com/corporate/index?page=content&id=SB10125'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html'}, {'name': '91787', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/91787'}, {'name': 'HPSBUX03388', 'tags': ['vendor-advisory', 'x_refsource_HP'], 'url': 'http://marc.info/?l=bugtraq&m=143880121627664&w=2'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05045763'}, {'name': '75652', 'tags': ['vdb-entry', 'x_refsource_BID'], 'url': 'http://www.securityfocus.com/bid/75652'}, {'tags': ['x_refsource_CONFIRM'], 'url': 'http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694'}, {'name': '38640', 'tags': ['exploit', 'x_refsource_EXPLOIT-DB'], 'url': 'https://www.exploit-db.com/exploits/38640/'}, {'name': 'SSA:2015-190-01', 'tags': ['vendor-advisory', 'x_refsource_SLACKWARE'], 'url': 'http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.561427'}, {'name': 'NetBSD-SA2015-008', 'tags': ['vendor-advisory', 'x_refsource_NETBSD'], 'url': 'http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc'}]
CVE State: PUBLISHED