CVE-2015-1793

Description

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.

Statement

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.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v2 Score Breakdown

Red HatNVDcve.org
Base Score5.86.4N/A
Attack VectorNetworkNetworkN/A
Access ComplexityMediumLowN/A
AuthenticationNoneNoneN/A
Confidentiality ImpactPartialPartialN/A
Integrity ImpactPartialPartialN/A
Availability ImpactNoneNoneN/A

Vector

Red Hat: AV:N/AC:M/Au:N/C:P/I:P/A:N

NVD: AV:N/AC:L/Au:N/C:P/I:P/A:N

Acknowledgements

Red Hat would like to thank OpenSSL upstream for reporting this issue. Upstream acknowledges Adam Langley (Google) and David Benjamin (BoringSSL) as the original reporters.

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