A flaw was found in the way OpenSSL verified alternative certificate chains. An attacker able to supply a certificate chain to an SSL/TLS or DTLS client or an SSL/TLS or DTLS server using client authentication could use this flaw to bypass certain checks in the verification process, possibly allowing them to use one of the certificates in the supplied certificate chain as a CA certificate to generate an invalid certificate.
Find out more about CVE-2015-1793 from the MITRE CVE dictionary dictionary and NIST NVD.
Not vulnerable. This issue does not affect any version of the OpenSSL package as shipped with Red Hat Enterprise Linux 4, 5, 6 and 7, JBoss Enterprise Application Platform 6, Red Hat JBoss Enterprise Web Server 1 and 2, and Red Hat JBoss Web Server 3 because they did not include support for alternative certificate chains.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 5.8 |
|---|---|
| Base Metrics | AV:N/AC:M/Au:N/C:P/I:P/A:N |
| Access Vector | Network |
| Access Complexity | Medium |
| Authentication | None |
| Confidentiality Impact | Partial |
| Integrity Impact | Partial |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat JBoss EWS 2 | openssl | Not affected |
| Red Hat JBoss EWS 1 | openssl | Not affected |
| Red Hat JBoss EAP 6 | openssl | Not affected |
| Red Hat Enterprise Linux 7 | openssl098e | Not affected |
| Red Hat Enterprise Linux 7 | openssl | Not affected |
| Red Hat Enterprise Linux 6 | openssl | Not affected |
| Red Hat Enterprise Linux 6 | openssl098e | Not affected |
| Red Hat Enterprise Linux 5 | openssl | Not affected |
| Red Hat Enterprise Linux 5 | openssl097a | Not affected |
| Red Hat Enterprise Linux 4 | openssl | Not affected |
Vulmon