CVE-2015-1793

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    CVE-2015-1793

    Published: 9 Jul 2015Last Modified: 16 Apr 2026

    Summary:

    Details: 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.

    References: http://fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery, http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.asc, http://openssl.org/news/secadv_20150709.txt, http://www.fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery, http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html, http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html, http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html, http://www1.huawei.com/en/security/psirt/security-bulletins/security-advisories/hw-454058.htm, https://security.gentoo.org/glsa/201507-15, https://www.freebsd.org/security/advisories/FreeBSD-SA-15:12.openssl.asc, http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html, http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html, http://www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html, http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10694, http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161747.html, http://lists.fedoraproject.org/pipermail/package-announce/2015-July/161782.html, http://marc.info/?l=bugtraq&m=143880121627664&w=2, http://marc.info/?l=bugtraq&m=144370846326989&w=2, http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150710-openssl, http://www.oracle.com/technetwork/topics/security/bulletinjul2015-2511963.html, http://www.securityfocus.com/bid/75652, http://www.securityfocus.com/bid/91787, http://www.securitytracker.com/id/1032817, http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.561427, https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=9a0db453ba017ebcaccbee933ee6511a9ae4d1c8, https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04822825, https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05045763, https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05184351, https://help.ecostruxureit.com/display/public/UADCO8x/StruxureWare+Data+Center+Operation+Software+Vulnerability+Fixes, https://kc.mcafee.com/corporate/index?page=content&id=SB10125, https://www.exploit-db.com/exploits/38640/

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2015-1793 | CVE-DB