Vulnerability identifier: #VU5892

Vulnerability risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2016-7054

CWE-ID: CWE-122

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 denial of service (Dos) attack.

The vulnerability exists due to a boundary error when processing *-CHACHA20-POLY1305 TLS ciphersuites (ChaCha20/Poly1305) in OpenSSL. A remote attacker can send large payloads to affected service, triggering heap overflow. 

Successful exploitation of the vulnerability may result in denial of service (DoS) conditions.

Mitigation

OpenSSL 1.1.0 users should upgrade to 1.1.0c

This issue does not affect OpenSSL versions prior to 1.1.0

Vulnerable software versions

OpenSSL: 1.1.0 - 1.1.0b

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External links
http://www.openssl.org/news/secadv/20161110.txt

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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, proof of concept for this vulnerability is available.