#VU1914 Information disclosure in OpenSSL - CVE-2016-0800

Vulnerability identifier: #VU1914

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:A/U:Green

CVE-ID: CVE-2016-0800

CWE-ID: CWE-327

Exploitation vector: Remote access

Exploit availability: Public exploit is available

Vulnerable software:
OpenSSL

Software vendor:
OpenSSL Software Foundation

The vulnerability allows a remote attacker to decrypt sensitive information.

The vulnerability exists due to usage of weak SSLv2 protocol, which requires to send a ServerVerify message before establishing that a client possesses certain plaintext RSA data. A remote attacker can decrypt TLS ciphertext data by leveraging a Bleichenbacher RSA padding oracle.

The vulnerability is dubbed "DROWN" attack.

Update to version 1.0.1s or 1.0.2g.

• https://drownattack.com/drown-attack-paper.pdf
• http://openssl.org/news/secadv/20160301.txt