CVE-2015-1793

Severity: medium (CVSS 6.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 58.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2015-07-09 · updated 2026-06-17
Weakness: CWE-254

Description

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

OpenSSL: 1.0.1n, 1.0.1o, 1.0.2b, 1.0.2c
Oracle Corporation JD Edwards EnterpriseOne Tools: 9.1, 9.2
Oracle Opus 10G Ethernet Switch Family: through 2.0.0.6
Oracle Supply Chain Products Suite: 6.1.2.2, 6.1.3.0, 6.2.0

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://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://openssl.org/news/secadv_20150709.txt
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150710-openssl
http://www.fortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgery
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html

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