CERT/CC Vulnerability Note VU#577193

Overview

Many modern TLS clients can fall back to version 3.0 of the SSL protocol, which is vulnerable to a padding-oracle attack when Cypher-block chaining (CBC) mode is used. This is commonly referred to as the "POODLE" (Padding Oracle On Downgraded Legacy Encryption) attack.

Description

CWE-327: Use of a Broken or Risky Cryptographic Algorithm - CVE-2014-3566

Multiple implementations of SSL 3.0, including the implementation in OpenSSL up to version 1.0.1i, support the use of CBC mode. However, SSL 3.0 is vulnerable to a padding-oracle attack when CBC mode is used. A successful padding-oracle attack can provide an attacker with cleartext information from the encrypted communications.

Additionally, many modern TLS clients still support the ability to fall back to the SSL 3.0 protocol in order to communicate with legacy servers. A man-in-the-middle attacker may be able to force the protocol version negotiation sequence to downgrade to SSL 3.0, thereby opening up the opportunity to exploit the padding-oracle attack.

For more information, please refer to the original security advisory .

Impact

An adjacent, unauthenticated attacker may be able to derive cleartext information from communications that utilize the SSL 3.0 protocol with CBC mode.

Solution

OpenSSL has fixed the issue in OpenSSL versions 1.0.1j, 1.0.0o, and 0.9.8zc. For other implementations of the protocol, please check with the appropriate maintainer or vendor to determine if the implementation is affected by this issue. Additionally, consider the following workaround:

Use TLS_FALLBACK_SCSV

If disabling SSL 3.0 is not possible, TLS client and server implementations should make use of the TLS_FALLBACK_SCSV cipher suite value to prevent man-in-the-middle attackers from forcing unnecessary protocol downgrades.

Vendor Information

577193

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Apple Inc. Affected

Updated: October 17, 2014

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

http://support.apple.com/kb/HT6531

Aruba Networks, Inc. Affected

Notified: October 17, 2014 Updated: October 20, 2014

Status

Affected

Vendor Statement

Aruba has published an advisory. Users should refer to the advisory for up-to-date information.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

http://www.arubanetworks.com/support/alerts/aid-10142014.txt

Attachmate Affected

Notified: October 17, 2014 Updated: October 27, 2014

Status

Affected

Vendor Statement

Attachmate has released an advisory.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

http://support.attachmate.com/techdocs/2750.html

Microsoft Corporation Affected

Notified: October 17, 2014 Updated: January 21, 2015

Status

Affected

Vendor Statement

https://technet.microsoft.com/en-us/library/security/3009008.aspx

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Mozilla Affected

Updated: October 17, 2014

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

https://blog.mozilla.org/security/2014/10/14/the-poodle-attack-and-the-end-of-ssl-3-0/

NEC Corporation Affected

Updated: October 28, 2014

Status

Affected

Vendor Statement

"We provide information on this issue at the following URL:

http://jpn.nec.com/security-info/av14-004.html"

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

http://jpn.nec.com/security-info/av14-004.html

Novell, Inc. Affected

Updated: October 27, 2014

Status

Affected

Vendor Statement

Novell has released an advisory.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

https://www.novell.com/support/kb/doc.php?id=7015777

OpenSSL Affected

Updated: October 17, 2014

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

SUSE Linux Affected

Updated: October 27, 2014

Status

Affected

Vendor Statement

SUSE has released an advisory.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

https://www.suse.com/support/kb/doc.php?id=7015773

Legion of the Bouncy Castle Not Affected

Notified: October 17, 2014 Updated: October 20, 2014

Status

Not Affected

Vendor Statement

"Bouncy Castle Java APIs version 1.46, or later, offer the ability to access SSL v3 by overriding methods in order to allow support for it. By default SSL v3 support is turned off.

It is possible to see if a developer has created the necessary overrides by looking for overrides of the methods AbstractTlsClient.getMinimumVersion () or TlsClient.notifyServerVersion () in client code, and by looking for overrides of AbstractTlsServer.getMinimumVersion () or TlsServer.getServerVersion () in server code.

Bouncy Castle C# APIs version 1.8 (still in beta), also contains a TLS API, which follows the same profile as the Bouncy Castle Java APIs in respect to SSL v3. Support for “TLS Fallback Signaling Cipher Suite Value (SCSV) for Preventing Protocol Downgrade Attacks”, currently described at

https://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00

has been added to both the Java and C# APIs to allow developers to prevent SSL v3 as anything but a worst case. We are planning to continue tracking the fallback document as it evolves and will include the results in the next releases of the Java and C# APIs (1.52 and 1.8 respectively)

For further enquiries in relation to this please contact us at office@bouncycastle.org."

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

https://www.bouncycastle.org/

PeerSec Networks Not Affected

Notified: October 17, 2014 Updated: October 20, 2014

Status

Not Affected

Vendor Statement

"MatrixSSL version support is configured with compile-time define, and we have disabled SSL3.0 by default since MatrixSSL 3.3.1 on July 16, 2012.

Anyone using MatrixSSL over the past 2 years would have had to manually enable SSL 3.0. Also, we do TLS style padding for SSL3.0 since the beginning for record encoding, however we can¹t enforce it on decoding, so that was of limited use unless communicating with our own library"

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Apache HTTP Server Project Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Apache-SSL Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Botan Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Certicom Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Cryptlib Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Crypto++ Library Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

EMC Corporation Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

F5 Networks, Inc. Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

GnuTLS Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

IAIK Java Group Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Mirapoint, Inc. Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Mozilla - Network Security Services Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

National Center for Supercomputing Applications Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Netscape NSS Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Nettle Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Nokia Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

SafeNet Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Spyrus Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

Stunnel Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

libgcrypt Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

mod_ssl Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

wolfSSL Unknown

Notified: October 17, 2014 Updated: October 17, 2014

Status

Unknown

Vendor Statement

We have not received a statement from the vendor.

Vendor References

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CVSS Metrics

Group	Score	Vector
Base	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N
Temporal	3.6	E:F/RL:OF/RC:C
Environmental	3.6	CDP:ND/TD:H/CR:ND/IR:ND/AR:ND

References

Acknowledgements

This document was written by Todd Lewellen.

Other Information

CVE IDs:	CVE-2014-3566
Date Public:	2014-10-14
Date First Published:	2014-10-17
Date Last Updated:	2015-01-21 19:34 UTC
Document Revision:	29

Software Engineering Institute

CERT Coordination Center

POODLE vulnerability in SSL 3.0

Vulnerability Note VU#577193

Overview

Description

Impact

Solution

Vendor Information

Apple Inc. Affected

Status

Vendor Statement

Vendor Information

Vendor References

Aruba Networks, Inc. Affected

Status

Vendor Statement

Vendor Information

Vendor References

Attachmate Affected

Status

Vendor Statement

Vendor Information

Vendor References

Microsoft Corporation Affected

Status

Vendor Statement

Vendor Information

Mozilla Affected

Status

Vendor Statement

Vendor Information

Vendor References

NEC Corporation Affected

Status

Vendor Statement

Vendor Information

Vendor References

Novell, Inc. Affected

Status

Vendor Statement

Vendor Information

Vendor References

OpenSSL Affected

Status

Vendor Statement

Vendor Information

SUSE Linux Affected

Status

Vendor Statement

Vendor Information

Vendor References

Legion of the Bouncy Castle Not Affected

Status

Vendor Statement

Vendor Information

Vendor References

PeerSec Networks Not Affected

Status

Vendor Statement

Vendor Information

Apache HTTP Server Project Unknown

Status

Vendor Statement

Vendor References

Apache-SSL Unknown

Status

Vendor Statement

Vendor References

Botan Unknown

Status

Vendor Statement

Vendor References

Certicom Unknown

Status

Vendor Statement

Vendor References

Cryptlib Unknown

Status

Vendor Statement