CVE-2015-3197

Impact:
Low
Public Date:
2016-01-28
Bugzilla:
1301846: CVE-2015-3197 OpenSSL: SSLv2 doesn't block disabled ciphers
A flaw was found in the way malicious SSLv2 clients could negotiate SSLv2 ciphers that were disabled on the server. This could result in weak SSLv2 ciphers being used for SSLv2 connections, making them vulnerable to man-in-the-middle attacks.

Find out more about CVE-2015-3197 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This security flaw can only be exploited when a malicious client negotiates SSLv2 ciphers and completes a SSLv2 handshake. This flaw cannot be actively exploited by a Man-In-The-Middle attacker.

All versions of OpenSSL shipped with Red Hat Enterprise Linux enable SSLv2 protocol, but disable SSLv2 ciphers by default (in Red Hat Enterprise Linux 6 and later), therefore are vulnerable to this flaw. Red Hat Product Security has rated this issue as having Low security impact, a future update may address this flaw.

SSLv2 suffers from a number of security flaws allowing attackers to capture and alter information passed between a client and the server. Therefore we strongly recommend that SSLv2 should be disabled on all the SSL/TLS servers.

CVSS v2 metrics

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).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux Advanced Update Support 6.5 (openssl) RHSA-2016:0303 2016-03-01
Red Hat Enterprise Linux Advanced Update Support 6.2 (openssl) RHSA-2016:0303 2016-03-01
Red Hat Enterprise Linux Long Life (v. 5.9 server) (openssl) RHSA-2016:0304 2016-03-01
Red Hat Enterprise Linux Extended Lifecycle Support 4 (openssl) RHSA-2016:0306 2016-03-01
Red Hat Enterprise Linux Extended Update Support 6.6 (openssl) RHSA-2016:0305 2016-03-01
Red Hat JBoss Enterprise Application Platform 6.4 RHSA-2016:0490 2016-03-22
Red Hat Enterprise Linux Long Life (v. 5.6 server) (openssl) RHSA-2016:0304 2016-03-01
RHEV Hypervisor for RHEL-6 (rhev-hypervisor7) RHSA-2016:0379 2016-03-09
Red Hat JBoss Web Server 2.1 RHSA-2016:0445 2016-03-14
Red Hat Enterprise Linux 6 (openssl) RHSA-2016:0301 2016-03-01
Managment Agent for RHEL 7 Hosts (rhev-hypervisor7) RHSA-2016:0379 2016-03-09
Red Hat JBoss Web Server 3.0 RHSA-2016:0446 2016-03-14
Red Hat Enterprise Linux Extended Update Support 7.1 (openssl) RHSA-2016:0305 2016-03-01
Red Hat Enterprise Linux Advanced Update Support 6.4 (openssl) RHSA-2016:0303 2016-03-01
Red Hat Enterprise Linux 7 (openssl) RHSA-2016:0301 2016-03-01
Red Hat Enterprise Linux 5 (openssl) RHSA-2016:0302 2016-03-01
Red Hat Enterprise Linux 7 (openssl098e) RHSA-2016:0372 2016-03-09
Red Hat Enterprise Linux 6 (openssl098e) RHSA-2016:0372 2016-03-09

Affected Packages State

Platform Package State
Red Hat JBoss EWS 1 openssl Will not fix
Red Hat JBoss EAP 5 openssl Will not fix
Red Hat Enterprise Linux Extended Update Support 7.2 rhel-guest-image Affected
Red Hat Enterprise Linux Extended Update Support 6.7 guest-images Affected
Red Hat Enterprise Linux 5 openssl097a Affected
RHEV-M for Servers rhev-hypervisor Affected

Acknowledgements

Red Hat would like to thank the OpenSSL project for reporting this issue. Upstream acknowledges Nimrod Aviram and Sebastian Schinzel as the original reporters.

External References

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