CVE-2015-3197
Description
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.
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.
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).
CVSS v2 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.8 | 4.3 | N/A |
| Attack Vector | Network | Network | N/A |
| Access Complexity | Medium | Medium | N/A |
| Authentication | None | None | N/A |
| Confidentiality Impact | Partial | Partial | N/A |
| Integrity Impact | Partial | None | N/A |
| Availability Impact | None | None | N/A |
Vector
Red Hat: AV:N/AC:M/Au:N/C:P/I:P/A:N
NVD: AV:N/AC:M/Au:N/C:P/I:N/A:N
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.
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