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Vulnerability Details : 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.
Publish Date : 2015-07-09 Last Update Date : 2018-11-30
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact None (There is no impact to the availability of the system.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 254

- Related OVAL Definitions

Title Definition Id Class Family
HP-UX OpenSSL Vulnerability (Alternative Chain Certificate Forgery) oval:org.mitre.oval:def:29158 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2015-1793

# Product Type Vendor Product Version Update Edition Language
1 Application Openssl Openssl 1.0.1n Version Details Vulnerabilities
2 Application Openssl Openssl 1.0.1o Version Details Vulnerabilities
3 Application Openssl Openssl 1.0.2b Version Details Vulnerabilities
4 Application Openssl Openssl 1.0.2c Version Details Vulnerabilities
5 Application Oracle Jd Edwards Enterpriseone Tools 9.1 Version Details Vulnerabilities
6 Application Oracle Jd Edwards Enterpriseone Tools 9.2 Version Details Vulnerabilities
7 OS Oracle Opus 10g Ethernet Switch Family Version Details Vulnerabilities
8 Application Oracle Supply Chain Products Suite Version Details Vulnerabilities
9 Application Oracle Supply Chain Products Suite Version Details Vulnerabilities
10 Application Oracle Supply Chain Products Suite 6.2.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Openssl Openssl 4
Oracle Jd Edwards Enterpriseone Tools 2
Oracle Opus 10g Ethernet Switch Family 1
Oracle Supply Chain Products Suite 3

- References For CVE-2015-1793 CONFIRM
SLACKWARE SSA:2015-190-01
GENTOO GLSA-201507-15;a=commit;h=9a0db453ba017ebcaccbee933ee6511a9ae4d1c8 CONFIRM CONFIRM CONFIRM CONFIRM
FEDORA FEDORA-2015-11414
BID 91787 Oracle July 2016 Critical Patch Update Multiple Vulnerabilities Release Date:2018-10-15
BID 75652 OpenSSL CVE-2015-1793 Certificate Verification Security Bypass Vulnerability Release Date:2016-10-19 CONFIRM CONFIRM CONFIRM CONFIRM
CISCO 20150710 OpenSSL Alternative Chains Certificate Forgery Vulnerability (July 2015) Affecting Cisco Products

- Metasploit Modules Related To CVE-2015-1793

OpenSSL Alternative Chains Certificate Forgery MITM Proxy
This module exploits a logic error in OpenSSL by impersonating the server and sending a specially-crafted chain of certificates, resulting in certain checks on untrusted certificates to be bypassed on the client, allowing it to use a valid leaf certificate as a CA certificate to sign a fake certificate. The SSL/TLS session is then proxied to the server allowing the session to continue normally and application data transmitted between the peers to be saved. The valid leaf certificate must not contain the keyUsage extension or it must have at least the keyCertSign bit set (see X509_check_issued function in crypto/x509v3/v3_purp.c); otherwise; X509_verify_cert fails with X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY. This module requires an active man-in-the-middle attack.
Module type : auxiliary Rank : normal

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