Vulnerability identifier: #VU5214

Vulnerability risk: Medium

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C]

CVE-ID: CVE-2014-3566

CWE-ID: CWE-327

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
OpenSSL
Server applications / Encryption software

Vendor: OpenSSL Software Foundation

Description
The vulnerability allows a remote attacker to perform MitM attack.

The vulnerability exists due to usage of insecure SSLv3 protocol in OpenSSL. A remote attacker can force the current connection between user and server to be downgraded to SSLv3 protocol and then use padding-oracle attack on Cypher-block chaining (CBC) mode to decrypt encrypted communication.

Successful exploitation of the vulnerability may allow an attacker to read encrypted communications in clear text.

Note: The vulnerability is known as POODLE.

Mitigation
Update OpenSSL to version 0.9.8zc, 1.0.0o or 1.0.1j.

Vulnerable software versions

OpenSSL: 1.0.1 - 1.0.1i, 1.0.0 - 1.0.0n, 0.9.8 - 0.9.8zb

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External links
http://www.openssl.org/news/secadv/20141015.txt
http://www.kb.cert.org/vuls/id/577193
http://marc.info/?l=openssl-dev&m=141333049205629&w=2
http://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00
http://www.openssl.org/~bodo/ssl-poodle.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.